Characterization of novel organic short wavelength infrared photosensors (Conference Presentation)

Weichuan Yao; Zhenghui Wu; Jason D. Azoulay; Tse Nga Ng

doi:10.1117/12.2271866

19 September 2017 Characterization of novel organic short wavelength infrared photosensors (Conference Presentation)

Weichuan Yao, Zhenghui Wu, Jason D. Azoulay, Tse Nga Ng

Proceedings Volume 10364, Organic Sensors and Bioelectronics X; 1036405 (2017) https://doi.org/10.1117/12.2271866
Event: SPIE Organic Photonics + Electronics, 2017, San Diego, California, United States

Abstract

Short wavelength infrared (SWIR) sensors are important to applications in environmental monitoring, medical diagnosis and optical communications, but there are only a few organic semiconductors that show optoelectronic response in the SWIR region. Recently we demonstrated a family of novel donor-acceptor polymers with narrow bandgap responsive in the SWIR region, and the bulk heterojunction photodiodes based on these polymers show detectivity up to 1E11 Jones at a wavelength of 1.37 micron, with absorption edge extending out to 1.7 micron. A SWIR photodiode was incorporated into the etalon-array reconstructive spectroscopy system to demonstrate its imaging capabilities. As the initial performance is very promising, we proceed to investigate the stability of the encapsulated devices and to infer the degradation mechanisms. The performance of photodiodes were monitored by IV measurement, external quantum efficiency (EQE) and electrochemical impedance spectroscopy. The IV measurement and electrochemical impedance spectroscopy were conducted both in the dark and under illumination, to track over several weeks the change in charge generation and recombination processes under the short circuit and open circuit conditions. The characteristics from band-to-band absorption and from absorption in charge-transfer states were compared to quantify the lifetime and recombination losses of photogenerated carriers in these devices.

Conference Presentation

Citation Download Citation

Weichuan Yao, Zhenghui Wu, Jason D. Azoulay, and Tse Nga Ng "Characterization of novel organic short wavelength infrared photosensors (Conference Presentation)", Proc. SPIE 10364, Organic Sensors and Bioelectronics X, 1036405 (19 September 2017); https://doi.org/10.1117/12.2271866

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KEYWORDS

Short wave infrared radiation

Absorption

Dielectric spectroscopy

Infrared imaging

Infrared radiation

Photodiodes

Heterojunctions

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