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arXiv · 2309.07370

Highly-Sensitive Resonance-Enhanced Organic Photodetectors for Shortwave Infrared Sensing

Hoang Mai Luong·Chokchai Kaiyasuan·Ahra Yi·Sangmin Chae·Brian Minki Kim·Patchareepond Panoy·Hyo Jung Kim·Vinich Promarak·Yasuo Miyata·Hidenori Nakayama·Thuc-Quyen Nguyen
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Abstract

Shortwave infrared (SWIR) has various applications, including night vision, remote sensing, and medical imaging. SWIR organic photodetectors (OPDs) offer advantages such as flexibility, cost-effectiveness, and tunable properties, however, lower sensitivity and limited spectral coverage compared to inorganic counterparts are major drawbacks. Here, we propose a simple yet effective and widely applicable strategy to extend the wavelength detection range of OPD to a longer wavelength, using resonant optical microcavity. We demonstrate a proof-of-concept in PTB7-Th:COTIC-4F blend system, achieving external quantum efficiency (EQE) > 50 % over a broad spectrum 450 - 1100 nm with a peak specific detectivity (D*) of 1.1E13 Jones at 1100 nm, while cut-off bandwidth, speed, and linearity are preserved. By employing a novel small-molecule acceptor IR6, a record high EQE = 35 % and D* = 4.1E12 Jones are obtained at 1150 nm. This research emphasizes the importance of optical design in optoelectronic devices, presenting a considerably simpler method to expand the photodetection range compared to a traditional approach that involves developing absorbers with narrow optical gaps.

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BibTeXRIS

Hoang Mai Luong, Chokchai Kaiyasuan, Ahra Yi, Sangmin Chae, Brian Minki Kim, Patchareepond Panoy, Hyo Jung Kim, Vinich Promarak, Yasuo Miyata, Hidenori Nakayama, Thuc-Quyen Nguyen. 2023-09-14. Highly-Sensitive Resonance-Enhanced Organic Photodetectors for Shortwave Infrared Sensing. https://doi.org/10.1021/acsenergylett.3c02296

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