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Proceedings Paper

Temperature-dependent characteristics of near-infrared organic bulk heterojunction photodiodes (Conference Presentation)
Author(s): Zhenghui Wu; Weichuan Yao; Jason D. Azoulay; Tse Nga Ng
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Paper 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.

Paper Details

Date Published: 7 November 2016
PDF: 1 pages
Proc. SPIE 9944, Organic Sensors and Bioelectronics IX, 99440A (7 November 2016); doi: 10.1117/12.2238443
Show Author Affiliations
Zhenghui Wu, Univ. of California, San Diego (United States)
Weichuan Yao, Univ. of California, San Diego (United States)
Jason D. Azoulay, The Univ. of Southern Mississippi (United States)
Tse Nga Ng, Univ. of California, San Diego (United States)

Published in SPIE Proceedings Vol. 9944:
Organic Sensors and Bioelectronics IX
Ioannis Kymissis; Ruth Shinar; Luisa Torsi, Editor(s)

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