A. K. Vega Salgado, N. Korneev, R. Valencia Yescas, S. Mansurova, K. Meerholz, Ismael Cosme Bolaños
We have demonstrated theoretically and experimentally that the current induced by an interference pattern moving at constant velocity can be used to determine the ion mobility and activation energy in perovskite semiconductors. The frequency dependence of the signal has features predicted by theory: the high-frequency peak corresponds to the electron/hole photoconductivity relaxation process, and the low-frequency peak occurs when the velocity of the interference pattern synchronizes with the ion motion; by determining the peak’s position, it becomes possible to estimate the ion mobility. The values of ion mobility and activation energy agree with the data reported in the literature.
{"title":"Photo electromotive force induced by running fringes for determination of ion mobility in perovskite semiconductors","authors":"A. K. Vega Salgado, N. Korneev, R. Valencia Yescas, S. Mansurova, K. Meerholz, Ismael Cosme Bolaños","doi":"10.1117/12.2676812","DOIUrl":"https://doi.org/10.1117/12.2676812","url":null,"abstract":"We have demonstrated theoretically and experimentally that the current induced by an interference pattern moving at constant velocity can be used to determine the ion mobility and activation energy in perovskite semiconductors. The frequency dependence of the signal has features predicted by theory: the high-frequency peak corresponds to the electron/hole photoconductivity relaxation process, and the low-frequency peak occurs when the velocity of the interference pattern synchronizes with the ion motion; by determining the peak’s position, it becomes possible to estimate the ion mobility. The values of ion mobility and activation energy agree with the data reported in the literature.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"12660 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128986512","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}
Ajay Kumar, Nivedita Pandey, Deepak Punetha, R. Saha, Samishta Choudhary, S. Chakrabarti
The lead-free halide-based perovskite is widely used because of its superior performance, long carrier diffusion length, narrow band emission, and tuneable bandgap. However, improvement of carrier lifetime and stability is the prime challenge for such perovskites. Therefore, reduced graphene oxide (rGO) is used as an additive material in CsSnI3 pristine perovskites to improve the optical, electronic, and structural properties. In this work, we synthesized the perovskite and rGO nanocomposite using the hot injection technique. We have performed photoluminescence (PL), ultraviolet spectroscopy (UV-Vis), X-ray diffraction (XRD), and Transmission electron microscopy (TEM) to understand the effect of rGO in Perovskite. In PL, a peak is found at ~ 782 nm for as-synthesis perovskite and after the 1% rGO incorporation, the peak is shifted towards the higher wavelength around ~ 811 nm. In XRD, the multiple diffraction peaks for the CsSnI3 perovskite and rGO nanocomposite are observed at 27.46°, 39.41°, 48.48°, 56.93°, and 64.38°, which originated from the indexing planes of (221), (112), (540), (082), and (053), respectively. The dominant peak (221) shifts towards the higher angle (0.07°) after 5% rGO incorporation. The UV-Vis spectroscopy confirms bandgap reduction after rGO incorporation in pristine CsSnI3 perovskite. The bandgaps of 1.64 eV and 1.56 eV are calculated from Tauc’s plot for CsSnI3 and rGO/CsSnI3 nanocomposite, respectively. Therefore, the rGO incorporation in the pristine CsSnI3 perovskite demonstrates highly promising properties, which opens the gateway towards the improvement of optoelectronics device performance.
{"title":"Reduced graphene oxide (rGO)-CsSnI3 nanocomposites: A cost-effective technique to improve the structural and optical properties for optoelectronic device applications","authors":"Ajay Kumar, Nivedita Pandey, Deepak Punetha, R. Saha, Samishta Choudhary, S. Chakrabarti","doi":"10.1117/12.2677967","DOIUrl":"https://doi.org/10.1117/12.2677967","url":null,"abstract":"The lead-free halide-based perovskite is widely used because of its superior performance, long carrier diffusion length, narrow band emission, and tuneable bandgap. However, improvement of carrier lifetime and stability is the prime challenge for such perovskites. Therefore, reduced graphene oxide (rGO) is used as an additive material in CsSnI3 pristine perovskites to improve the optical, electronic, and structural properties. In this work, we synthesized the perovskite and rGO nanocomposite using the hot injection technique. We have performed photoluminescence (PL), ultraviolet spectroscopy (UV-Vis), X-ray diffraction (XRD), and Transmission electron microscopy (TEM) to understand the effect of rGO in Perovskite. In PL, a peak is found at ~ 782 nm for as-synthesis perovskite and after the 1% rGO incorporation, the peak is shifted towards the higher wavelength around ~ 811 nm. In XRD, the multiple diffraction peaks for the CsSnI3 perovskite and rGO nanocomposite are observed at 27.46°, 39.41°, 48.48°, 56.93°, and 64.38°, which originated from the indexing planes of (221), (112), (540), (082), and (053), respectively. The dominant peak (221) shifts towards the higher angle (0.07°) after 5% rGO incorporation. The UV-Vis spectroscopy confirms bandgap reduction after rGO incorporation in pristine CsSnI3 perovskite. The bandgaps of 1.64 eV and 1.56 eV are calculated from Tauc’s plot for CsSnI3 and rGO/CsSnI3 nanocomposite, respectively. Therefore, the rGO incorporation in the pristine CsSnI3 perovskite demonstrates highly promising properties, which opens the gateway towards the improvement of optoelectronics device performance.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121859551","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}
Víctor Fernández-González, S. Echeverría-Alar, G. González-Cortés, J. Vergara, P. Hidalgo, M. Clerc
Metamaterials have subwavelength periodic structures that manipulate electromagnetic waves. Typically, difficulties are encountered in fabricating this type of materials due to the sophisticated techniques involved in their creation. Bubble domains in chiral nematic liquid crystals present a skyrmion lattice which has periodicity regions along a cell, which allow the observation of unconventional light-matter interaction. However, the interaction dynamics between vortices presents a challenge to ensure the order of the lattice throughout the space it covers. In this work we study the use of liquid crystal microdroplets as potential wells and the clustering of topological defects in them.
{"title":"Vortex clustering in chiral nematic liquid crystal microdroplets","authors":"Víctor Fernández-González, S. Echeverría-Alar, G. González-Cortés, J. Vergara, P. Hidalgo, M. Clerc","doi":"10.1117/12.2672975","DOIUrl":"https://doi.org/10.1117/12.2672975","url":null,"abstract":"Metamaterials have subwavelength periodic structures that manipulate electromagnetic waves. Typically, difficulties are encountered in fabricating this type of materials due to the sophisticated techniques involved in their creation. Bubble domains in chiral nematic liquid crystals present a skyrmion lattice which has periodicity regions along a cell, which allow the observation of unconventional light-matter interaction. However, the interaction dynamics between vortices presents a challenge to ensure the order of the lattice throughout the space it covers. In this work we study the use of liquid crystal microdroplets as potential wells and the clustering of topological defects in them.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"55 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132870328","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}
T. Sasaki, Toshinobu Takashi, Kai Suzuki, Gouta Ikeda, Miku Nagaoka, Y. Ishii, Khoa Van Le, Y. Naka
Coaxial- and counter-optical setups for laser ultrasonics using a photorefractive liquid crystal were fabricated. The laser ultrasonics involves irradiating an object with a laser pulse to produce an ultrasonic vibration, and then using another laser beam to detect the vibration. The phase of the laser beam reflected from the object is shifted by the ultrasonic vibration. By using liquid crystals with photorefractive properties, the resulting phase shift of the laser beam reflected from the material can be detected. Compared to traditional laser ultrasonic methods, this system offers a simpler optical setup and allows for more precise measurements that are unaffected by environmental vibrations.
{"title":"Laser ultrasonics using photorefractive liquid crystals","authors":"T. Sasaki, Toshinobu Takashi, Kai Suzuki, Gouta Ikeda, Miku Nagaoka, Y. Ishii, Khoa Van Le, Y. Naka","doi":"10.1117/12.2676230","DOIUrl":"https://doi.org/10.1117/12.2676230","url":null,"abstract":"Coaxial- and counter-optical setups for laser ultrasonics using a photorefractive liquid crystal were fabricated. The laser ultrasonics involves irradiating an object with a laser pulse to produce an ultrasonic vibration, and then using another laser beam to detect the vibration. The phase of the laser beam reflected from the object is shifted by the ultrasonic vibration. By using liquid crystals with photorefractive properties, the resulting phase shift of the laser beam reflected from the material can be detected. Compared to traditional laser ultrasonic methods, this system offers a simpler optical setup and allows for more precise measurements that are unaffected by environmental vibrations.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121264771","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}
We demonstrated an image-based polarization detection system comprising 4 tunable liquid crystal wave plate and 4 polarizers for the measurement of full Stokes parameters and material recognition with a single shot. In this paper, based on polarization property, the metal plate and the glass substrate could be recognized. The one of the applications is to provide a practical way in image-based polarization detection in Advanced Driver Assistance Systems for material recognition which could help in driving safety.
{"title":"Image-based polarization detection and material recognition based on liquid crystals","authors":"Yi-Hsin Lin, Hao Huang, Yu-Jen Wang, Huai-An Hsieh, Po-Lun Chen","doi":"10.1117/12.2679401","DOIUrl":"https://doi.org/10.1117/12.2679401","url":null,"abstract":"We demonstrated an image-based polarization detection system comprising 4 tunable liquid crystal wave plate and 4 polarizers for the measurement of full Stokes parameters and material recognition with a single shot. In this paper, based on polarization property, the metal plate and the glass substrate could be recognized. The one of the applications is to provide a practical way in image-based polarization detection in Advanced Driver Assistance Systems for material recognition which could help in driving safety.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127011503","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}
The development of multifocal microlens array has paid many attentions recently with the applications of plenoptic cameras, stereoscopic displays, and beam homogenizers. A variety of technologies have been explored and applied to produce multifocal microlens arrays, however, most multifocal microlens arrays are limited due to structural modification, long fabrication time, and lack of tunability. In this study, we present a novel method of fabricating a tunable multifocal liquid crystal microlens array (TMLCMA) using the three-electrode structure composed of a large hole, small-hole array, and planar electrodes. Liquid crystals with positive dielectric anisotropy were filled in the TMLCMA sample and aligned planar with antiparallel rubbing treatment. A modal layer was deposited on the surface of the large hole electrode to assist in extending the fringing electric field into the TMLCMA center. The fringing electric field induced by the large hole electrode results in the microlenses have different focal lengths from the TMLCMA border to the center. The TMLCMA can be worked in concave and convex modes on the basis of signal control schemes. The beam patterns through the TMLCMA are observed and the phase shifts of the microlenses at various positions are reported. The optical imaging of the TMLCMA has been demonstrated practically. The results reveal that the proposed method is able to produce a tunable multifocal microlens array via a simple fabrication and addressing scheme. This study has proposed a strong basis for the further development of microlens array, and the optical characteristics of the TMLCMA are promising to applications of optical fields.
{"title":"Tunable multifocal liquid crystal microlens array based on three-electrode structure","authors":"Mareena Antony, Yu-Wu Wang, C. Hsu, C. Huang","doi":"10.1117/12.2677308","DOIUrl":"https://doi.org/10.1117/12.2677308","url":null,"abstract":"The development of multifocal microlens array has paid many attentions recently with the applications of plenoptic cameras, stereoscopic displays, and beam homogenizers. A variety of technologies have been explored and applied to produce multifocal microlens arrays, however, most multifocal microlens arrays are limited due to structural modification, long fabrication time, and lack of tunability. In this study, we present a novel method of fabricating a tunable multifocal liquid crystal microlens array (TMLCMA) using the three-electrode structure composed of a large hole, small-hole array, and planar electrodes. Liquid crystals with positive dielectric anisotropy were filled in the TMLCMA sample and aligned planar with antiparallel rubbing treatment. A modal layer was deposited on the surface of the large hole electrode to assist in extending the fringing electric field into the TMLCMA center. The fringing electric field induced by the large hole electrode results in the microlenses have different focal lengths from the TMLCMA border to the center. The TMLCMA can be worked in concave and convex modes on the basis of signal control schemes. The beam patterns through the TMLCMA are observed and the phase shifts of the microlenses at various positions are reported. The optical imaging of the TMLCMA has been demonstrated practically. The results reveal that the proposed method is able to produce a tunable multifocal microlens array via a simple fabrication and addressing scheme. This study has proposed a strong basis for the further development of microlens array, and the optical characteristics of the TMLCMA are promising to applications of optical fields.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116162177","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}
By the application of electromagnetic fields onto an homeotropic nematic liquid crystal cell it is possible to induce vortices, which are particle-type defects with topological charge. The dynamics of the vortices is such that topological charge of the system is conserved, so these defects are always induced in pairs that annihilate after a short amount of time. Using a magnetic ring it is possible to induce a stable vortex triplet that allows the study of its dynamics, which is of an oscillatory kind when a low-frequency voltage is applied. Experimentally, we determine the region of parameters where the vortex triplet is stable, unstable, or becomes a lattice of vortices. We propose an amplitude equation which allow us to describe the vortex dynamics, and numerical simulations show agreement with experimental observations.
{"title":"Topological transition to a vortices lattice in a nematic liquid crystal cell","authors":"R. Gajardo-Pizarro, M. Clerc","doi":"10.1117/12.2676438","DOIUrl":"https://doi.org/10.1117/12.2676438","url":null,"abstract":"By the application of electromagnetic fields onto an homeotropic nematic liquid crystal cell it is possible to induce vortices, which are particle-type defects with topological charge. The dynamics of the vortices is such that topological charge of the system is conserved, so these defects are always induced in pairs that annihilate after a short amount of time. Using a magnetic ring it is possible to induce a stable vortex triplet that allows the study of its dynamics, which is of an oscillatory kind when a low-frequency voltage is applied. Experimentally, we determine the region of parameters where the vortex triplet is stable, unstable, or becomes a lattice of vortices. We propose an amplitude equation which allow us to describe the vortex dynamics, and numerical simulations show agreement with experimental observations.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129104434","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}
Arcelia Bernal Díaz, Rosalinda Sánchez-Arenas Sánchez Arenas, Miguel Ángel González Martínez, R. Shigematsu, Maximino Avendaño Alejo, Francisco Adrian Rodriguez Espitia, Diego Rolando González Álvarez, Brian Alberto Venegas Rayon
Nowadays the prevention of dementia is a challenge for humanity. There are some preventive intervention programs for dementia, which are mainly based in the modification of multicomponent lifestyles such as: physical and cognitive activity, weight control, metabolic-comorbidity control and social support. Recently, Mind and Movement Program to have Cognitive Health is a collaborative methodological proposal between the countries Mexico, Japan and Canada, which consists of three components: aerobic exercise; aerobic and cognitive exercises, as well as a motivation program. For performing aerobic and cognitive exercises, the monitoring of vital signs in real time is necessary through a statistical analysis of the data of each patient, in such a way that the doctor knows the state of health of the patient. As a consequence of the COVID-19 pandemic, the original program to acquire experimental data underwent modifications. Since the older adults were isolated, they were required to do their physical exercises at home, implementing a remote monitoring system based on a wearable smart band, which was properly developed to monitor the vital signs for each patient. Hence, a personalized quantification of the oxygen saturation and cardiac pressure based on light sensors and pressure sensors, respectively, was measured and monitored in real time. On the other hand, predefined programming based on Artificial intelligence, provides certain advantages for easy handling by the older adults. Currently, we are working along with a hospital, where doctors involved in the program are testing the prototype for the validation of the wearable smart bands.
{"title":"Remote monitoring of vital signs in older adults for prevention of cognitive decline","authors":"Arcelia Bernal Díaz, Rosalinda Sánchez-Arenas Sánchez Arenas, Miguel Ángel González Martínez, R. Shigematsu, Maximino Avendaño Alejo, Francisco Adrian Rodriguez Espitia, Diego Rolando González Álvarez, Brian Alberto Venegas Rayon","doi":"10.1117/12.2678344","DOIUrl":"https://doi.org/10.1117/12.2678344","url":null,"abstract":"Nowadays the prevention of dementia is a challenge for humanity. There are some preventive intervention programs for dementia, which are mainly based in the modification of multicomponent lifestyles such as: physical and cognitive activity, weight control, metabolic-comorbidity control and social support. Recently, Mind and Movement Program to have Cognitive Health is a collaborative methodological proposal between the countries Mexico, Japan and Canada, which consists of three components: aerobic exercise; aerobic and cognitive exercises, as well as a motivation program. For performing aerobic and cognitive exercises, the monitoring of vital signs in real time is necessary through a statistical analysis of the data of each patient, in such a way that the doctor knows the state of health of the patient. As a consequence of the COVID-19 pandemic, the original program to acquire experimental data underwent modifications. Since the older adults were isolated, they were required to do their physical exercises at home, implementing a remote monitoring system based on a wearable smart band, which was properly developed to monitor the vital signs for each patient. Hence, a personalized quantification of the oxygen saturation and cardiac pressure based on light sensors and pressure sensors, respectively, was measured and monitored in real time. On the other hand, predefined programming based on Artificial intelligence, provides certain advantages for easy handling by the older adults. Currently, we are working along with a hospital, where doctors involved in the program are testing the prototype for the validation of the wearable smart bands.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126431996","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}
Gurudutt Bhat, Marcin Kielar, M. Gholami, Pankaj Sah, Ajay K. Pandey, P. Sonar
Organic photodetectors (OPDs) hold great promise for use in flexible electronics as they can be designed on substrates featuring various shapes and using cost-effective solution-processed methods. Organic conjugated materials offering two or more distinct optoelectronic functions are especially appealing here as they provide multifunctionality while also retaining the ease of fabrication and low-cost advantage. One such material is TPA-azaBODIPY-TPA that has been shown to feature ideal charge transfer properties and excitation energy levels. In our recent work, we demonstrated the versatile nature of this material acting as either a charge transport interlayer in perovskite solar cells, or as a light-absorbing layer in OPDs. TPA-azaBODIPY-TPA-based solar cellsshowed a 60 % increase in power conversion efficiency when compared to a control device using a conventional interlayer PEDOT:PSS. Having also demonstrated the successful utilization of TPA-azaBODIPY-TPA in OPDs manufactured on glass substrates, we further explore its applications in the design and fabrication of flexible OPDs for near-infrared sensing. Fabricated devices on flexible substrates show a near-infrared spectral responsivity of 49 mA W-1 at 730 nm, a high linear dynamic range of 110 dB and fast temporal responses below 100 μs. With robust thermal stability as well as excellent solubility and processability, TPA-azaBODIPY-TPA is found to be perfect candidate for the next-generation of smart optoelectronic flexible devices.
有机光电探测器(opd)在柔性电子器件中具有很大的应用前景，因为它们可以设计在具有各种形状的基板上，并使用具有成本效益的解决方案处理方法。提供两种或多种不同光电功能的有机共轭材料在这里特别有吸引力，因为它们在提供多功能的同时还保留了易于制造和低成本的优势。一种这样的材料是TPA-azaBODIPY-TPA，它已被证明具有理想的电荷转移特性和激发能级。在我们最近的工作中，我们展示了这种材料的多用途性质，既可以作为钙钛矿太阳能电池中的电荷传输中间层，也可以作为opd中的光吸收层。与使用传统层间PEDOT:PSS的控制装置相比，tpa - azabodipy - tpa基太阳能电池的功率转换效率提高了60%。在证明TPA-azaBODIPY-TPA在玻璃基板opd中的成功应用之后，我们进一步探索了其在近红外传感柔性opd的设计和制造中的应用。在柔性衬底上制备的器件在730 nm处的近红外光谱响应率为49 mA W-1，线性动态范围为110 dB，时间响应小于100 μs。TPA-azaBODIPY-TPA具有强大的热稳定性以及优异的溶解性和可加工性，是下一代智能光电柔性器件的完美候选材料。
{"title":"Low bandgap donor-acceptor-donor-based TPA-azaBODIPY-TPA small molecule for flexible near-infrared organic photodetectors","authors":"Gurudutt Bhat, Marcin Kielar, M. Gholami, Pankaj Sah, Ajay K. Pandey, P. Sonar","doi":"10.1117/12.2677285","DOIUrl":"https://doi.org/10.1117/12.2677285","url":null,"abstract":"Organic photodetectors (OPDs) hold great promise for use in flexible electronics as they can be designed on substrates featuring various shapes and using cost-effective solution-processed methods. Organic conjugated materials offering two or more distinct optoelectronic functions are especially appealing here as they provide multifunctionality while also retaining the ease of fabrication and low-cost advantage. One such material is TPA-azaBODIPY-TPA that has been shown to feature ideal charge transfer properties and excitation energy levels. In our recent work, we demonstrated the versatile nature of this material acting as either a charge transport interlayer in perovskite solar cells, or as a light-absorbing layer in OPDs. TPA-azaBODIPY-TPA-based solar cellsshowed a 60 % increase in power conversion efficiency when compared to a control device using a conventional interlayer PEDOT:PSS. Having also demonstrated the successful utilization of TPA-azaBODIPY-TPA in OPDs manufactured on glass substrates, we further explore its applications in the design and fabrication of flexible OPDs for near-infrared sensing. Fabricated devices on flexible substrates show a near-infrared spectral responsivity of 49 mA W-1 at 730 nm, a high linear dynamic range of 110 dB and fast temporal responses below 100 μs. With robust thermal stability as well as excellent solubility and processability, TPA-azaBODIPY-TPA is found to be perfect candidate for the next-generation of smart optoelectronic flexible devices.","PeriodicalId":145218,"journal":{"name":"Organic Photonics + Electronics","volume":"31 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131453777","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}
Nestor O. Marquez Rios, Nida Khattak, Bianca Seufert, Daniel Takshi, A. Takshi
Among different conducting polymers, PEDOT:PSS has been used for making organic electrochemical transistors (OECTs) due to the remarkable stability and the electrochemical properties of the polymer. With the fast-growing market for wearable electronics, the application of OECTs has been proposed for wearable sensors. However, the majority of OECTs have a planar design. Recently, we have demonstrated the feasibility of fabricating OECTs on sewing threads. This work has focused on studying the effect of thread materials on the performance of fiber-based OECTs made for wearable pH sensors. Such sensors can be used to collect metabolic information from the body of a patient by analyzing the pH of perspiration. The three most commercially common different kinds of threads were used to make OECTs with polyvinyl alcohol (PVA) gel as the electrolyte. Using 100% cotton, 25% cotton-75% polyester, and 32% cotton-68% polyester threads were used to fabricate and then characterize the transistor. Threads were coated with PEDOT:PSS polymer to use as a channel then use a Silver coated thread as a gate and a PVA gel electrolyte. Devices were tested by applying different voltages to the transistor terminals and monitoring the current through the PEDOT:PSS. The best signal was obtained from the device made on 25% cotton-75% polyester thread. The experimental results showed a promising approach that can lead to a good wearable pH sensor on human perspiration.
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