Yuming Wang, Hui Zhao, Mingyang Yang, Youshan Qu, XueWu Fan
Traditional imaging lidar exhibits an obvious trade-off between the resolution and the size of its optical system. In order to realize a miniaturized super-resolution (SR) imaging lidar, Fourier ptychography (FP) has been introduced to break through the diffraction limit of the camera lens. FP, derived from synthetic aperture method, is capable of acquiring high resolution and large field-of-view reconstructed images without increasing the aperture size by capturing multiple images with diverse incident angles before computationally combining with phase retrieval algorithm. In this work, a SR imaging lidar system was proposed by using reflective-type FP, which mainly consists of a s-CMOS camera, a Nd:YAG laser, and a 2-D translation stage so as to achieve aperture scanning on the x and y axes. To validate this technique experimentally, a set of images of a positive USAF chrome-on-glass target were obtained for quantitative analysis, and an uneven 1 yuan nickel-on-steel RMB coin was used to simulate the applicability of the SR imaging lidar in practical applications. The observations show that the obtained images based on FP technique have an obvious improvement in resolution, contrast, and clarity. It is worth mentioning that the resolution of these reconstructed images is increased over 3 times in the experiment on the USAF target. Moreover, the images under different apertures were collected, processed and analyzed, which suggest the initial image quality has a non-negligible influence on the reconstructed results. This technique not only improves the performance of the imaging lidar while maintaining low costs, but also bring new vitality in remote image recognition and analysis.
{"title":"Super-resolution imaging lidar based on Fourier ptychography","authors":"Yuming Wang, Hui Zhao, Mingyang Yang, Youshan Qu, XueWu Fan","doi":"10.1117/12.2604172","DOIUrl":"https://doi.org/10.1117/12.2604172","url":null,"abstract":"Traditional imaging lidar exhibits an obvious trade-off between the resolution and the size of its optical system. In order to realize a miniaturized super-resolution (SR) imaging lidar, Fourier ptychography (FP) has been introduced to break through the diffraction limit of the camera lens. FP, derived from synthetic aperture method, is capable of acquiring high resolution and large field-of-view reconstructed images without increasing the aperture size by capturing multiple images with diverse incident angles before computationally combining with phase retrieval algorithm. In this work, a SR imaging lidar system was proposed by using reflective-type FP, which mainly consists of a s-CMOS camera, a Nd:YAG laser, and a 2-D translation stage so as to achieve aperture scanning on the x and y axes. To validate this technique experimentally, a set of images of a positive USAF chrome-on-glass target were obtained for quantitative analysis, and an uneven 1 yuan nickel-on-steel RMB coin was used to simulate the applicability of the SR imaging lidar in practical applications. The observations show that the obtained images based on FP technique have an obvious improvement in resolution, contrast, and clarity. It is worth mentioning that the resolution of these reconstructed images is increased over 3 times in the experiment on the USAF target. Moreover, the images under different apertures were collected, processed and analyzed, which suggest the initial image quality has a non-negligible influence on the reconstructed results. This technique not only improves the performance of the imaging lidar while maintaining low costs, but also bring new vitality in remote image recognition and analysis.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127683973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yangyi Liu, N. Gu, Cheng Li, Lianhui Zheng, C. Rao
This paper focuses on the optimization of heat dissipation efficiency in heat-stop of large ground-based solar telescope. The cooling structure of multi-channel loop cooling system for solar telescope CLST with 1.8 meters’ aperture is designed and built in Ansys-CFX software based on computational fluid dynamics. During the optimized simulation of the models, number and position of inlets, coolant flow rate and maximum temperature are taken as variables, constraint and objective respectively. In case of same coolant flow rate, more numbers of inlets and position of inlets are closer to the axis of heat-stop, the maximum temperature on the heat-stop decreases. In the design of CLST heat-stop cooling structure, after arrangement of the number and position of inlets in heat-stop cooling structure, its cooling efficiency increases by 35 percent.
{"title":"Optimized thermal design of heat-stop of large ground-based solar telescope CLST","authors":"Yangyi Liu, N. Gu, Cheng Li, Lianhui Zheng, C. Rao","doi":"10.1117/12.2626171","DOIUrl":"https://doi.org/10.1117/12.2626171","url":null,"abstract":"This paper focuses on the optimization of heat dissipation efficiency in heat-stop of large ground-based solar telescope. The cooling structure of multi-channel loop cooling system for solar telescope CLST with 1.8 meters’ aperture is designed and built in Ansys-CFX software based on computational fluid dynamics. During the optimized simulation of the models, number and position of inlets, coolant flow rate and maximum temperature are taken as variables, constraint and objective respectively. In case of same coolant flow rate, more numbers of inlets and position of inlets are closer to the axis of heat-stop, the maximum temperature on the heat-stop decreases. In the design of CLST heat-stop cooling structure, after arrangement of the number and position of inlets in heat-stop cooling structure, its cooling efficiency increases by 35 percent.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127926830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kewei Chen, Dan Jia, Zhongliang Ying, Zhige Zhang, Nian Pan, Jinlong Huang, Kunpeng Wang, L. Xue
The 1.2-m primary mirror supporting systems are composed of axial support system with whiffletree structure and lateral support system with 6 tangent links. With the simulation based on the finite element analysis (FEA), the 18 points positions of the axial support are determined and the bottom chamber structure of the primary mirror is improved. In order to reduce the mirror surface deformation, the assembly stress on the primary mirror is reduced by optimizing the lateral support structure. The analysis results demonstrated that the root-mean-square (RMS) of the surface deformation is 10.9nm when the primary mirror points vertically. Meanwhile the RMS of the surface deformation is 10.3nm when the primary mirror points horizontally.
{"title":"Design and optimization of 1.2-m primary mirror supporting systems","authors":"Kewei Chen, Dan Jia, Zhongliang Ying, Zhige Zhang, Nian Pan, Jinlong Huang, Kunpeng Wang, L. Xue","doi":"10.1117/12.2604579","DOIUrl":"https://doi.org/10.1117/12.2604579","url":null,"abstract":"The 1.2-m primary mirror supporting systems are composed of axial support system with whiffletree structure and lateral support system with 6 tangent links. With the simulation based on the finite element analysis (FEA), the 18 points positions of the axial support are determined and the bottom chamber structure of the primary mirror is improved. In order to reduce the mirror surface deformation, the assembly stress on the primary mirror is reduced by optimizing the lateral support structure. The analysis results demonstrated that the root-mean-square (RMS) of the surface deformation is 10.9nm when the primary mirror points vertically. Meanwhile the RMS of the surface deformation is 10.3nm when the primary mirror points horizontally.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132617187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Han Yin, Sheng Wang, Qingliang Zhao, B. Guo, Jianbo Zhao
Hard-brittle thin-walled tubular optics are widely used in the field of high-power solid-state lasers. The 3D accuracy requirement and the clamping deformation of the hard and brittle thin-walled structure pose a great challenge for ultra-precision manufacturing. In this paper, fused silica thin-walled tubular optics with the length of 100mm, the inner diameter of 42mm and the outer diameter of 50mm were fabricated successfully through ultra-precision grinding. The profile accuracy of PV1.6μm, the surface roughness of Ra10nm, the straightness of 1.64μm, the roundness of 1.62μm and the cylindricity of 2.13μm were achieved through in-place dressing of grinding wheel, on-machine measurement, off-line measurement, and the iterative compensation machining. The technical difficulties of ultra-precision manufacturing of hard brittle thin-walled optics have been overcome.
{"title":"Ultra-precision grinding and accuracy measurement of the hard-brittle thin-walled tubular optics","authors":"Han Yin, Sheng Wang, Qingliang Zhao, B. Guo, Jianbo Zhao","doi":"10.1117/12.2604310","DOIUrl":"https://doi.org/10.1117/12.2604310","url":null,"abstract":"Hard-brittle thin-walled tubular optics are widely used in the field of high-power solid-state lasers. The 3D accuracy requirement and the clamping deformation of the hard and brittle thin-walled structure pose a great challenge for ultra-precision manufacturing. In this paper, fused silica thin-walled tubular optics with the length of 100mm, the inner diameter of 42mm and the outer diameter of 50mm were fabricated successfully through ultra-precision grinding. The profile accuracy of PV1.6μm, the surface roughness of Ra10nm, the straightness of 1.64μm, the roundness of 1.62μm and the cylindricity of 2.13μm were achieved through in-place dressing of grinding wheel, on-machine measurement, off-line measurement, and the iterative compensation machining. The technical difficulties of ultra-precision manufacturing of hard brittle thin-walled optics have been overcome.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114668451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cavity enhanced absorption spectroscopy (CEAS) technology is one of the new types laser absorption spectroscopy technique with high sensitivity and relatively simple detection principle, which is developing rapidly and becoming more and more popular in the field of trace gas detection. A scheme of high sensitivity infrared optical feedback cavity enhanced absorption spectroscopy system is established, based on the high quality optical passive resonator made of ultralow expansion coefficient glass-ceramics, combined with the optical feedback effect of semiconductor laser which can narrow the output laser linewidth and stabilize the laser frequency. The spectral scanning of the system is realized by simultaneously scanning the cavity length of the resonator and tuning the laser current, and the spectral resolution of 0.003 cm-1 and the noise equivalent absorption sensitivity are better than 2×10-9 cm-1Hz-1/2. The system is expected to be applied to real-time analysis of respiratory gas and realize the application of the technology in human breath diagnosis.
{"title":"A scheme for trace gas detection using infrared optical feedback cavity enhanced spectroscopy","authors":"Shiyu Guan, Huilin Cao, Yucheng Ouyang, Z. Tan","doi":"10.1117/12.2605380","DOIUrl":"https://doi.org/10.1117/12.2605380","url":null,"abstract":"Cavity enhanced absorption spectroscopy (CEAS) technology is one of the new types laser absorption spectroscopy technique with high sensitivity and relatively simple detection principle, which is developing rapidly and becoming more and more popular in the field of trace gas detection. A scheme of high sensitivity infrared optical feedback cavity enhanced absorption spectroscopy system is established, based on the high quality optical passive resonator made of ultralow expansion coefficient glass-ceramics, combined with the optical feedback effect of semiconductor laser which can narrow the output laser linewidth and stabilize the laser frequency. The spectral scanning of the system is realized by simultaneously scanning the cavity length of the resonator and tuning the laser current, and the spectral resolution of 0.003 cm-1 and the noise equivalent absorption sensitivity are better than 2×10-9 cm-1Hz-1/2. The system is expected to be applied to real-time analysis of respiratory gas and realize the application of the technology in human breath diagnosis.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114602251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cutting in ductile mode is a prerequisite for mirror machining of single crystal brittle materials. Under the condition that the cutting thickness is less than the critical undeformed chip thickness, the single crystal brittle material is removed in ductile mode. The critical undeformed chip thickness of single crystal brittle materials is not an intrinsic parameter, but a variable related to stress conditions, crystal orientation and other factors. In this paper, aiming at the critical undeformed chip thickness of single crystal germanium, the influence of the changes of crystal orientation, tool rake angle and linear velocity on the critical undeformed chip thickness of single crystal germanium is investigated by means of constant linear velocity single point diamond turning. The experimental results show that critical undeformed chip thickness of single crystal germanium varies in different crystal orientations. Large tool negative rake angle can increase the critical undeformed chip thickness of single crystal germanium. Increasing the linear velocity within a certain range can increase the critical undeformed chip thickness of single crystal germanium, however, excessive linear velocity will worsen the cutting state and reduce the critical undeformed chip thickness. This study provides some references for ductile mode cutting of single crystal germanium and other brittle materials.
{"title":"Researching on the factors influencing the critical undeformed chip thickness of single crystal germanium","authors":"Sha Ma, H. Yang, Qian Chen, Haibo Yang","doi":"10.1117/12.2604765","DOIUrl":"https://doi.org/10.1117/12.2604765","url":null,"abstract":"Cutting in ductile mode is a prerequisite for mirror machining of single crystal brittle materials. Under the condition that the cutting thickness is less than the critical undeformed chip thickness, the single crystal brittle material is removed in ductile mode. The critical undeformed chip thickness of single crystal brittle materials is not an intrinsic parameter, but a variable related to stress conditions, crystal orientation and other factors. In this paper, aiming at the critical undeformed chip thickness of single crystal germanium, the influence of the changes of crystal orientation, tool rake angle and linear velocity on the critical undeformed chip thickness of single crystal germanium is investigated by means of constant linear velocity single point diamond turning. The experimental results show that critical undeformed chip thickness of single crystal germanium varies in different crystal orientations. Large tool negative rake angle can increase the critical undeformed chip thickness of single crystal germanium. Increasing the linear velocity within a certain range can increase the critical undeformed chip thickness of single crystal germanium, however, excessive linear velocity will worsen the cutting state and reduce the critical undeformed chip thickness. This study provides some references for ductile mode cutting of single crystal germanium and other brittle materials.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116152965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hao Zhang, Ji-Hyeong An, Weihao Li, Xiao-dong Zhang
In infrared optical system, changes of the reflective index will result in a decrease in imaging quality. Therefore, athermalized treatment is necessary. Chalcogenide glasses (As40Se60) are the ideal material for thermal aberration correction in infrared optical systems, which have excellent infrared optical properties, especially the transmission performance and temperature characteristics. However, thermal deformation is inevitable for chalcogenide glasses in the coating process, which is a major cause of quality deterioration. In this paper, a deep cryogenic treatment with a series of specific parameters is carried out and a comparative experiment is conducted. The result shows that the thermal stability of chalcogenide glass in the coating process is improved markedly after deep cryogenic treatment. The thermal deformation of the optical surface is reduced and the surface accuracy is controllable.
{"title":"Thermal deformation suppression method for chalcogenide glass based on deep cryogenic treatment","authors":"Hao Zhang, Ji-Hyeong An, Weihao Li, Xiao-dong Zhang","doi":"10.1117/12.2604071","DOIUrl":"https://doi.org/10.1117/12.2604071","url":null,"abstract":"In infrared optical system, changes of the reflective index will result in a decrease in imaging quality. Therefore, athermalized treatment is necessary. Chalcogenide glasses (As40Se60) are the ideal material for thermal aberration correction in infrared optical systems, which have excellent infrared optical properties, especially the transmission performance and temperature characteristics. However, thermal deformation is inevitable for chalcogenide glasses in the coating process, which is a major cause of quality deterioration. In this paper, a deep cryogenic treatment with a series of specific parameters is carried out and a comparative experiment is conducted. The result shows that the thermal stability of chalcogenide glass in the coating process is improved markedly after deep cryogenic treatment. The thermal deformation of the optical surface is reduced and the surface accuracy is controllable.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116241769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Magnetorheological finishing (MRF) has been widely used in the field of modern optical machining due to the high certainty of processing. In the processing of spherical components, the detection means and sample preparation limit the acquisition of magnetorheological spherical tool influence function. In order to realize the high precision manufacturing of spherical components, the spherical removal function in the magneto-rheological polishing process is simulated and applied in practice. Based on the Preston equation, the material removal of the planar component was analyzed and the plane tool influence function model was established. On this basis, the correlation between spherical removal and plane removal was analyzed, and a simplified spherical tool influence function simulation method was proposed, and its accuracy was verified by experiments. Aiming at the processing of spherical components, the processing technology was improved and the actual processing was carried out. After processing, the PV value of the transmitted wavefront was 0.09λ, and the RMS value was 3.2 nm. The experimental results show that the spherical tool influence function simulated in this paper can be applied in actual processing and obtain a high-quality optical surface.
{"title":"Simulation and application of spherical tool influence function for magnetorheological finishing","authors":"Hong-xiang Wang, Shiwei Liu, Qing-hua Zhang, Jing Hou, Xianhua Chen","doi":"10.1117/12.2603930","DOIUrl":"https://doi.org/10.1117/12.2603930","url":null,"abstract":"Magnetorheological finishing (MRF) has been widely used in the field of modern optical machining due to the high certainty of processing. In the processing of spherical components, the detection means and sample preparation limit the acquisition of magnetorheological spherical tool influence function. In order to realize the high precision manufacturing of spherical components, the spherical removal function in the magneto-rheological polishing process is simulated and applied in practice. Based on the Preston equation, the material removal of the planar component was analyzed and the plane tool influence function model was established. On this basis, the correlation between spherical removal and plane removal was analyzed, and a simplified spherical tool influence function simulation method was proposed, and its accuracy was verified by experiments. Aiming at the processing of spherical components, the processing technology was improved and the actual processing was carried out. After processing, the PV value of the transmitted wavefront was 0.09λ, and the RMS value was 3.2 nm. The experimental results show that the spherical tool influence function simulated in this paper can be applied in actual processing and obtain a high-quality optical surface.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122184944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Frequency Selective Surface (FSS), which is a kind of emerging artificial metamaterial, is widely used in research and engineering areas and attracting more and more attention. In this paper, we apply the finite difference time domain method including the surface impedance absorbing boundary condition (SIABC) to simulate different FSS. Both the magnetic field (H-) and electric field (E-) collocated SIABC are implemented. The H-collocated SIABC could be directly combined with the periodic boundary condition without extra formula derivation while the updating equations for the E-collocated SIABC combined with PBC are derived. The reflection error and stability of the proposed method are analyzed, and different FSSs including a dipole FSS and a Jarusalem cross are simulated under normal incidence. The co-polarized reflection and transmission coefficients of the FSSs are obtained. Good agreement is reached with the FDTD method including convolutional perfectly matched layer, while up to 41.88% of time and 40.98% of memory is saved.
{"title":"Surface impedance absorbing boundary condition used for the simulation of frequency selective surfaces","authors":"Weibo Liang, Hongxing Zheng","doi":"10.1117/12.2604722","DOIUrl":"https://doi.org/10.1117/12.2604722","url":null,"abstract":"Frequency Selective Surface (FSS), which is a kind of emerging artificial metamaterial, is widely used in research and engineering areas and attracting more and more attention. In this paper, we apply the finite difference time domain method including the surface impedance absorbing boundary condition (SIABC) to simulate different FSS. Both the magnetic field (H-) and electric field (E-) collocated SIABC are implemented. The H-collocated SIABC could be directly combined with the periodic boundary condition without extra formula derivation while the updating equations for the E-collocated SIABC combined with PBC are derived. The reflection error and stability of the proposed method are analyzed, and different FSSs including a dipole FSS and a Jarusalem cross are simulated under normal incidence. The co-polarized reflection and transmission coefficients of the FSSs are obtained. Good agreement is reached with the FDTD method including convolutional perfectly matched layer, while up to 41.88% of time and 40.98% of memory is saved.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130602520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Perovskite has attracted enormous research interest due to the unique advantages, such as high absorption coefficient, great carrier mobility, low exciton binding energy, etc., providing desirable applications in high-performance perovskite solar cells (PSCs). However, the current density-voltage (J-V) hysteresis phenomenon in PSC will reduce the testing accuracy and weaken the actual device performance. In this paper, a facile method based on interfacial engineering is proposed to suppress the hysteresis phenomenon and the deeper physicochemical mechanism is systematically analyzed. By incorporating non-fullerene acceptor Y6 in the crystallization process, a denser and continuous perovskite film with a low-density defect state is obtained, which affords PSC dramatically suppressed the J-V hysteresis with the hysteresis difference decreasing from 13.6% to 1.9% at the maximum power point. Furthermore, scanning electron microscope results and energy dispersive spectrum mappings suggest that ultrathin Y6 film is deposited between the perovskite film and the hydrophobic electron transport layer of PC61BM. The improvement of wettability and matching energy level caused by Y6, render the photocurrent increase and the power conversion efficiency of PSC@Y6 high up to 17.5%. Thus, this work demonstrates that interfacial engineering using small-molecule non-fullerene acceptor is a promising strategy to suppress the J-V hysteresis limiting further PSC commercialization.
{"title":"Suppressed J-V hysteresis in highly efficient inverted perovskite solar cells using small-molecule non-fullerene acceptor","authors":"Mengge Wu, Pu Fan, S. Hou, Junsheng Yu","doi":"10.1117/12.2603928","DOIUrl":"https://doi.org/10.1117/12.2603928","url":null,"abstract":"Perovskite has attracted enormous research interest due to the unique advantages, such as high absorption coefficient, great carrier mobility, low exciton binding energy, etc., providing desirable applications in high-performance perovskite solar cells (PSCs). However, the current density-voltage (J-V) hysteresis phenomenon in PSC will reduce the testing accuracy and weaken the actual device performance. In this paper, a facile method based on interfacial engineering is proposed to suppress the hysteresis phenomenon and the deeper physicochemical mechanism is systematically analyzed. By incorporating non-fullerene acceptor Y6 in the crystallization process, a denser and continuous perovskite film with a low-density defect state is obtained, which affords PSC dramatically suppressed the J-V hysteresis with the hysteresis difference decreasing from 13.6% to 1.9% at the maximum power point. Furthermore, scanning electron microscope results and energy dispersive spectrum mappings suggest that ultrathin Y6 film is deposited between the perovskite film and the hydrophobic electron transport layer of PC61BM. The improvement of wettability and matching energy level caused by Y6, render the photocurrent increase and the power conversion efficiency of PSC@Y6 high up to 17.5%. Thus, this work demonstrates that interfacial engineering using small-molecule non-fullerene acceptor is a promising strategy to suppress the J-V hysteresis limiting further PSC commercialization.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131492893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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