Organic photodiodes with bias-switchable photomultiplication and photovoltaic modes

Qingxia Liu, Lingfeng Li, Jiaao Wu, Yang Wang (), Liu Yuan, Zhi Jiang, Jianhua Xiao, Deen Gu, Weizhi Li, Huiling Tai () and Yadong Jiang
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Qingxia Liu: University of Electronic Science and Technology of China
Lingfeng Li: University of Electronic Science and Technology of China
Jiaao Wu: University of Electronic Science and Technology of China
Yang Wang: University of Electronic Science and Technology of China
Liu Yuan: University of Electronic Science and Technology of China
Zhi Jiang: Nanyang Technological University
Jianhua Xiao: University of Electronic Science and Technology of China
Deen Gu: University of Electronic Science and Technology of China
Weizhi Li: University of Electronic Science and Technology of China
Huiling Tai: University of Electronic Science and Technology of China
Yadong Jiang: University of Electronic Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The limited sensitivity of photovoltaic-type photodiodes makes it indispensable to use pre-amplifier circuits for effectively extracting electrical signals, especially when detecting dim light. Additionally, the photomultiplication photodiodes with light amplification function suffer from potential damages caused by high power consumption under strong light. In this work, by adopting the synergy strategy of thermal-induced interfacial structural traps and blocking layers, we develop a dual-mode visible-near infrared organic photodiode with bias-switchable photomultiplication and photovoltaic operating modes, exhibiting high specific detectivity (~1012 Jones) and fast response speed (0.05/3.03 ms for photomultiplication-mode; 8.64/11.14 μs for photovoltaic-mode). The device also delivers disparate external quantum efficiency in two optional operating modes, showing potential in simultaneously detecting dim and strong light ranging from ~10−9 to 10−1 W cm−2. The general strategy and working mechanism are validated in different organic layers. This work offers an attractive option to develop bias-switchable multi-mode organic photodetectors for various application scenarios.

Date: 2023
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DOI: 10.1038/s41467-023-42742-0

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