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7 November 2016 Temperature-dependent characteristics of near-infrared organic bulk heterojunction photodiodes (Conference Presentation)
Zhenghui Wu, Weichuan Yao, Jason D. Azoulay, Tse Nga Ng
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Proceedings Volume 9944, Organic Sensors and Bioelectronics IX; 99440A (2016) https://doi.org/10.1117/12.2238443
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States
Abstract
Photosensors responsive to the short wavelength infrared (SWIR) spectra are used in a variety of applications including environmental monitoring, medical diagnosis and optical communications. However, most organic semiconductors do not absorb in the SWIR region. Here we show novel donor-acceptor polymers with narrow bandgap responsive in the SWIR region, and the polymers are processed into photodiodes with structure of ITO/PEDOT:PSS/Bulk Heterojunction (BHJ)/Al. The performance of devices with different polymer structures are compared through metrics including detectivity, quantum efficiency, response time and rectification ratio, to determine the mechanisms of charge recombination loss in charge transfer states and charge transport process. We also use different solution-processed interfacial functional layers (e.g. ZnO, MoO3, TiO2) as electrode interface structures. The results provide guideline for selecting suitable polymers and design of device structures, to enable high performance SWIR photosensor via scalable solution-processed fabrication.
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Zhenghui Wu, Weichuan Yao, Jason D. Azoulay, and Tse Nga Ng "Temperature-dependent characteristics of near-infrared organic bulk heterojunction photodiodes (Conference Presentation)", Proc. SPIE 9944, Organic Sensors and Bioelectronics IX, 99440A (7 November 2016); https://doi.org/10.1117/12.2238443
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KEYWORDS
Short wave infrared radiation
Polymers
Heterojunctions
Photodiodes
Environmental monitoring
Infrared radiation
Medical diagnostics
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