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Transparent organic photodiodes for high-detectivity CMOS image sensors

Journal
Optica
Date
2022.08.25
Abstract

The demand for high-definition complementary metal-oxide?semiconductor (CMOS) image sensors has increased considerably over the past few years in industry as well as in academia. Here we propose transparent green-sensitive organic photodetectors (TG-OPDs) with both dark-current-based high detectivity (over 1014cmHz1/2W−1'>1014cmHz1/2W11014cmHz1/2W?1 at a wavelength of 550 nm under 3 V) and high responsivity (0.34AW−1'>0.34AW10.34AW?1 under 3 V) for organic?silicon hybrid CMOS image sensors. A bathocuproine:C60'>bathocuproine:C60bathocuproine:C60 electron-transporting layer provided the fabricated TG-OPDs with a minimal junction resistivity, smooth morphology, and desirable energy level modulation, resulting in exceptional light sensitivity, a low dark current (below 10−11Acm−2'>1011Acm210?11Acm?2), and a high rectification ratio spanning 10 orders of magnitude. The TG-OPDs had high-temperature endurance (up to 150°C for 2 h) and operational stability under intense heat (above 85°C) for 50 d. We expect this performance to enable the industrialization of these TG-OPDs for optoelectronic sensor applications, such as photoplethysmography, fingerprint recognition, proximity sensing, and imaging.

Reference
Optica, 9, 992-998 (2022)
DOI
http://dx.doi.org/10.1364/OPTICA.449557