Shichen Yin, F. So, S. Ding, Li-ping Zhu, Qi Dong, Carr Hoi Yi Ho
Narrow bandgap lead sulfide (PbS) quantum dots (QDs) are solution-processed materials used for optoelectronic applications in the short-wavelength infrared (SWIR) range (1400 - 3000 nm). The PbS QDs based photodetector has achieved comparable detectivity with current commercial SWIR sensors. However, there are still obstacles towards commercialization in commonly used layer by layer (LbL) deposition, such as high material consumption and low reproducibility. Here, we developed a new ligand exchange strategy to prepare ligand exchanged QD inks for single-step PbS film deposition. Compared with LbL deposition, the EQE of PbS QD photodetector made by single-step deposition has improved from 31% to 53%. The EQE and responsivity can be further improved to 95% with IR transparent electrode.
{"title":"Enhanced lead sulfide quantum dots infrared photodetector performance through ligand exchange","authors":"Shichen Yin, F. So, S. Ding, Li-ping Zhu, Qi Dong, Carr Hoi Yi Ho","doi":"10.1117/12.2603399","DOIUrl":"https://doi.org/10.1117/12.2603399","url":null,"abstract":"Narrow bandgap lead sulfide (PbS) quantum dots (QDs) are solution-processed materials used for optoelectronic applications in the short-wavelength infrared (SWIR) range (1400 - 3000 nm). The PbS QDs based photodetector has achieved comparable detectivity with current commercial SWIR sensors. However, there are still obstacles towards commercialization in commonly used layer by layer (LbL) deposition, such as high material consumption and low reproducibility. Here, we developed a new ligand exchange strategy to prepare ligand exchanged QD inks for single-step PbS film deposition. Compared with LbL deposition, the EQE of PbS QD photodetector made by single-step deposition has improved from 31% to 53%. The EQE and responsivity can be further improved to 95% with IR transparent electrode.","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124279607","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}
Zachary A. Lamport, Marco R. Cavallari, M. Bardash, I. Kymissis
Here, we report on an all-organic solid-state radiation dosimeter patterned onto a plastic substrate that allows for real-time measurements communicated over WiFi. The “sense” area and the conductive traces are made using low-conductivity PEDOT:PSS, and measurements are read out by a low-current op-amp. As the detector is subjected to radiation, the ionized air, substrate, and sense area cause a charge accumulation which is then read out as a voltage from the op-amp. OFETs on either side of the sense area allow for the charge to be cleared, allowing for accurate dose measurement without saturation. Additionally, the inclusion of a PEDOT:PSS ground plane as the first layer on the PEN substrate helps to shield the sensor itself from extraneous static. For X-rays, the limit of detection is approximately 5 mRad/min, and for gamma rays the limit is approximately 5 mRad/hr. Through appropriate control of the clearing OFETs, the device is quickly reset to allow for a continuous measurement.
{"title":"Organic radiation detectors for real-time dosimetry","authors":"Zachary A. Lamport, Marco R. Cavallari, M. Bardash, I. Kymissis","doi":"10.1117/12.2597183","DOIUrl":"https://doi.org/10.1117/12.2597183","url":null,"abstract":"Here, we report on an all-organic solid-state radiation dosimeter patterned onto a plastic substrate that allows for real-time measurements communicated over WiFi. The “sense” area and the conductive traces are made using low-conductivity PEDOT:PSS, and measurements are read out by a low-current op-amp. As the detector is subjected to radiation, the ionized air, substrate, and sense area cause a charge accumulation which is then read out as a voltage from the op-amp. OFETs on either side of the sense area allow for the charge to be cleared, allowing for accurate dose measurement without saturation. Additionally, the inclusion of a PEDOT:PSS ground plane as the first layer on the PEN substrate helps to shield the sensor itself from extraneous static. For X-rays, the limit of detection is approximately 5 mRad/min, and for gamma rays the limit is approximately 5 mRad/hr. Through appropriate control of the clearing OFETs, the device is quickly reset to allow for a continuous measurement.","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129666611","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}
Hung Phan, Thomas Jerome Kelly, H. Huynh, An Nguyen, A. Zhugayevych, S. Tretiak, Thuc‐Quyen Nguyen, E. Jarvis
The change in optical properties of an organic semiconductors upon forming adducts with inexpensive small molecules is attractive in organic electronics. We focus on the adducts of conjugated molecules and Lewis acids (CM-LA), formed by the partial electron transfer from a CM containing a Lewis basic site to an LA such as BF3 and B(C6F5)3. The resulting adducts showed intriguing optoelectronic properties, including a red-shift in optical transitions and an increase in charge carrier density compared to the parent conjugated molecules. In this work, we combine electronic structure modelling and machine learning (ML) to quantify, analyze and predict the electron transfers and red-shifts of the adducts from chemical structures. For ML model, we utilize DFT-calculated electron transfers and redshifts and molecular descriptors readily calculated from molecular structures. Our work can help researchers in other fields in predicting fundamental properties from molecular structures.
{"title":"Tuning optical properties of conjugated molecules by Lewis acids: Insights from electronic structure modeling and machine learning","authors":"Hung Phan, Thomas Jerome Kelly, H. Huynh, An Nguyen, A. Zhugayevych, S. Tretiak, Thuc‐Quyen Nguyen, E. Jarvis","doi":"10.1117/12.2594321","DOIUrl":"https://doi.org/10.1117/12.2594321","url":null,"abstract":"The change in optical properties of an organic semiconductors upon forming adducts with inexpensive small molecules is attractive in organic electronics. We focus on the adducts of conjugated molecules and Lewis acids (CM-LA), formed by the partial electron transfer from a CM containing a Lewis basic site to an LA such as BF3 and B(C6F5)3. The resulting adducts showed intriguing optoelectronic properties, including a red-shift in optical transitions and an increase in charge carrier density compared to the parent conjugated molecules. In this work, we combine electronic structure modelling and machine learning (ML) to quantify, analyze and predict the electron transfers and red-shifts of the adducts from chemical structures. For ML model, we utilize DFT-calculated electron transfers and redshifts and molecular descriptors readily calculated from molecular structures. Our work can help researchers in other fields in predicting fundamental properties from molecular structures.","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121791717","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}
Andrew M. Zeidell, T. Ren, David S. Filston, H. Haneef, Emma K. Holland, D. Bourland, J. Anthony, O. Jurchescu
Controlling the amount of radiation that a cancer patient receives during treatment is critical to ensure the intended treatment outcome. In this work we use small molecule organic semiconductor devices as radiation sensors/dosimeters which have an effective Z close to that of human tissue. Solution processing provides excellent opportunities for scalability on flexible substrates, allowing them to conform to skin and clothing, and enabling dose measurement at the point of entry to the human body. Previous work using organic field-effect transistors (OFETs) for radiation detection has focused on radiation doses much greater than received by patients during cancer diagnostic imaging and treatment, while this work focuses on the response of OFET-based sensors at low doses relevant to cancer treatment. A systematic change in the threshold voltage of the FETs was observed with cumulative dose. Our results demonstrate that OFETs may be used in dosimetry applications for oncology.
{"title":"Organic field-effect transistors as radiation dosimeters in medical applications","authors":"Andrew M. Zeidell, T. Ren, David S. Filston, H. Haneef, Emma K. Holland, D. Bourland, J. Anthony, O. Jurchescu","doi":"10.1117/12.2597577","DOIUrl":"https://doi.org/10.1117/12.2597577","url":null,"abstract":"Controlling the amount of radiation that a cancer patient receives during treatment is critical to ensure the intended treatment outcome. In this work we use small molecule organic semiconductor devices as radiation sensors/dosimeters which have an effective Z close to that of human tissue. Solution processing provides excellent opportunities for scalability on flexible substrates, allowing them to conform to skin and clothing, and enabling dose measurement at the point of entry to the human body. Previous work using organic field-effect transistors (OFETs) for radiation detection has focused on radiation doses much greater than received by patients during cancer diagnostic imaging and treatment, while this work focuses on the response of OFET-based sensors at low doses relevant to cancer treatment. A systematic change in the threshold voltage of the FETs was observed with cumulative dose. Our results demonstrate that OFETs may be used in dosimetry applications for oncology.","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122063634","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}
Halide perovskites are very attractive for solution-processed visible and near-IR sensing applications due to their intrinsic advantages such as excellent photosensitivity, bandgap tunability, broadband sensitivity, high charge transport capability, and solution-processability. Unlike Pb-based perovskites, which cannot be tuned to below 1.48 eV, Pb-Sn mixed halide perovskites exhibit low bandgaps of 1.2-1.3 eV. Due to the low bandgap, these Pb-Sn mixed halide perovskite can absorb light till 1000nm making them a viable alternative to Silicon as the visible and near-IR broadband photodetectors. However, the low-bandgap nature of Pb-Sn mixed perovskites also causes large levels of electron and hole injection from anode and cathode, thus leading to high dark current. To mitigate the issue of charge injection, therefore, it is important to have an electron blocking layer (EBL) and a hole blocking layer (HBL) inserted between the electrodes and the Pb-Sn mixed perovskite photodetectors.
{"title":"High detectivity UV-visible-NIR broadband perovskite photodetector using Pb-Sn mixed narrow-gap absorber and NiOx electron blocker","authors":"Do Young Kim, V. Yeddu, Gijun Seo","doi":"10.1117/12.2594999","DOIUrl":"https://doi.org/10.1117/12.2594999","url":null,"abstract":"Halide perovskites are very attractive for solution-processed visible and near-IR sensing applications due to their intrinsic advantages such as excellent photosensitivity, bandgap tunability, broadband sensitivity, high charge transport capability, and solution-processability. Unlike Pb-based perovskites, which cannot be tuned to below 1.48 eV, Pb-Sn mixed halide perovskites exhibit low bandgaps of 1.2-1.3 eV. Due to the low bandgap, these Pb-Sn mixed halide perovskite can absorb light till 1000nm making them a viable alternative to Silicon as the visible and near-IR broadband photodetectors. However, the low-bandgap nature of Pb-Sn mixed perovskites also causes large levels of electron and hole injection from anode and cathode, thus leading to high dark current. To mitigate the issue of charge injection, therefore, it is important to have an electron blocking layer (EBL) and a hole blocking layer (HBL) inserted between the electrodes and the Pb-Sn mixed perovskite photodetectors.","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128241458","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}
Sudhanva Vasishta, Xiao Wang, Calla M. McCulley, K. Raghunandan, T. R. Viswanathan, A. Dodabalapur
{"title":"Organic and graphene based chemically sensitive neuromorphic circuit","authors":"Sudhanva Vasishta, Xiao Wang, Calla M. McCulley, K. Raghunandan, T. R. Viswanathan, A. Dodabalapur","doi":"10.1117/12.2597275","DOIUrl":"https://doi.org/10.1117/12.2597275","url":null,"abstract":"","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130733296","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}
M. Nanayakkara, M. Masteghin, L. Basiricò, Ilaria Fratelli, A. Ciavatti, B. Fraboni, K. Jayawardena, Ravi Silva
{"title":"Designing organic-inorganic hybrid semiconductors for curved x-ray detectors","authors":"M. Nanayakkara, M. Masteghin, L. Basiricò, Ilaria Fratelli, A. Ciavatti, B. Fraboni, K. Jayawardena, Ravi Silva","doi":"10.1117/12.2594810","DOIUrl":"https://doi.org/10.1117/12.2594810","url":null,"abstract":"","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125922178","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 applications of functional nanomaterials towards biological interfacing continue to emerge in various fields, such as in drug delivery and tissue engineering. While the rational control of surface chemistry and mechanical properties have been achieved for several of these biocompatible systems, these biomaterials are rarely synthesized with optical and electronic functionalities that could be beneficial for controlling the behavior of excitable cells for biosensing applications. In this talk, the development of self-assembling peptide materials appended with organic electronic units will be discussed. These materials can facilitate photoinduced energy transfer under aqueous environments. Semiconducting peptide monomers that can self-assemble as aligned hydrogels are successfully built according to design principles that allowed for directed photonic energy transport, sequential electron transport in a multicomponent system, and transmission or equilibration of voltage or current when incorporated in a transistor device. These soft scaffolding materials, with tunable molecular to macroscale properties, offer a unique tissue engineering platform that can locally and synergistically deliver electronic, topographical, and biochemical cues to cells. This presentation will also discuss the future applications of optoelectronically-active peptide assemblies as tools for controlling cellular processes and probing biophysical phenomena, such as action potential propagation, mechanotransduction, and drug/toxicant permeation across tissues.
{"title":"Optoelectronically-active peptide materials towards biointerfacing","authors":"H. A. M. Ardoña","doi":"10.1117/12.2595169","DOIUrl":"https://doi.org/10.1117/12.2595169","url":null,"abstract":"The applications of functional nanomaterials towards biological interfacing continue to emerge in various fields, such as in drug delivery and tissue engineering. While the rational control of surface chemistry and mechanical properties have been achieved for several of these biocompatible systems, these biomaterials are rarely synthesized with optical and electronic functionalities that could be beneficial for controlling the behavior of excitable cells for biosensing applications. In this talk, the development of self-assembling peptide materials appended with organic electronic units will be discussed. These materials can facilitate photoinduced energy transfer under aqueous environments. Semiconducting peptide monomers that can self-assemble as aligned hydrogels are successfully built according to design principles that allowed for directed photonic energy transport, sequential electron transport in a multicomponent system, and transmission or equilibration of voltage or current when incorporated in a transistor device. These soft scaffolding materials, with tunable molecular to macroscale properties, offer a unique tissue engineering platform that can locally and synergistically deliver electronic, topographical, and biochemical cues to cells. This presentation will also discuss the future applications of optoelectronically-active peptide assemblies as tools for controlling cellular processes and probing biophysical phenomena, such as action potential propagation, mechanotransduction, and drug/toxicant permeation across tissues.","PeriodicalId":295051,"journal":{"name":"Organic and Hybrid Sensors and Bioelectronics XIV","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116709079","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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