Bias‐Switchable Photomultiplication and Photovoltaic Dual‐Mode Near‐Infrared Organic Photodetector

• DOI: 10.1002/adma.202500491
• Publication Date: 2025-03-12T06:39:55Z
• Authors: Yijun Huang; Lin Shao; Yazhong Wang; Lu Hao; Xi Luo; Jie Zheng; Yunhao Cao; Shuaiqi Li; Zhaohong Tan; Shuai Li; Wenkai Zhong; Sheng Dong; Xiye Yang; Johannes Benduhn; Chunchen Liu; Karl Leo; Fei Huang
• Keywords: Photocurrent; Quantum Efficiency; Photodiode; Photoactive layer; Dual mode

Photomultiplication-type organic photodetectors (PM-OPDs) provide for signal amplification, ideal detecting faint light, and simplifying detection systems. However, current designs often suffer from slow response speed elevated dark current. Conversely, photovoltaic-type (PV-OPDs) fast high specific detectivity (D*) but have limited photoresponse. This study presents the synthesis incorporation of a non-fullerene acceptor, BFDO-4F, into active layer to introduce trap states capturing photogenerated electrons. The resulting device exhibits dual-mode characteristic is bias-switchable between PV PM-modes. In PV-mode, OPDs achieve D* 1.92 × 10¹2 Jones time 2.83/4.43 µs. PM-mode, exhibit exceptional external quantum efficiency (EQE) up 3484% 1.13 Jones. An on-chip self-powered module with PV-mode pixels driving PM-mode pixel demonstrated, yielding photocurrent approximately five times higher than reference device. approach paves way developing multifunctional OPDs, suitable various applications.