High-Efficiency Solution-Processed Near-Infrared Organic Photodiodes

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Organic photodiodes (OPDs) have recently been studied for various applications such as organic image sensors, bio-inspired artificial eyes, and wearable bio sensors. By taking advantage of tunable optical properties, large-area scalability, and mechanical flexibility of organic electronic materials, OPD-based image sensors may be beneficial in large-sized or bendable image sensors that can be coupled with displays in various form factors. In particular, the need of near-infrared (NIR) organic photodiodes is growing as it can be useful for detection of clear images under low-light conditions (e.g. face recognition in dark) or for detection of various biosignals (e.g. veinimaging based identification, or pulse oximetry data). To fully utilize the potential of NIR organic photodiodes, however, the external quantum efficiency (EQE) and simplicity in fabrication need to be improved further to match the requirements for many of the applications. The aim of this study is to fabricate NIR organic photodiodes and improve EQE in a simple manner compatible with the existing infrastructure and common process. In this regard, we adopt common solution-processed organic donor-acceptor blendsand try to exploit their charge-transfer (CT) absorption band in the NIR region. On top of that, the microcavity effect is applied to compensate a relatively low CT absorption in the NIR region to improve EQE. Upon optimization, we demonstrate approximately ten-fold increase in EQE from 1.16% to 10.60% in the wavelength of 985 nm, illustrating that the proposed approach holds a great promise in detecting NIR photons with relatively long wavelength at high efficiency.
Publisher
The Korean Information Display Society
Issue Date
2021-08-25
Language
English
Citation

IMID 2021 (21th International Meeting on Information Display)

URI
http://hdl.handle.net/10203/288192
Appears in Collection
EE-Conference Papers(학술회의논문)
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