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Blocking Layer Induced Bi‐Directional Biased Photomultiplication‐Type Near‐Infrared Flexible Organic Photodetectors

Shuaiqi LiInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 ChinaYazhong WangInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 ChinaHao LuInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 ChinaZhaohong TanInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 ChinaYijun HuangInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 ChinaWenkai ZhongInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 ChinaSheng DongXiye YangFei HuangInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 China

2024en

ABI

Annotatsiya

Abstract Photomultiplication‐type organic photodetectors (PM‐OPDs) effectively amplify photogenerated signals, eliminating the need for external amplifiers and simplifying detection systems. Current designs require high bias voltages, leading to significant power consumption. This study introduces PM‐OPDs with reduced bias voltage by incorporating a hole‐blocking layer (HBL) between the active layer and electrode. Deep HOMO level and thin HBL facilitate hole accumulation and energy level bending, lowering bias voltage and enhancing electron injection. The elevated LUMO level of the HBL minimizes non‐radiative recombination and prolongs the lifetime of accumulated holes, resulting in greater photogains. Four HBLs—BCP, PFN‐Br, BPhen, and C 60 —are explored with ZnO serving as an electron transporting layer (ETL). By applying a bi‐directional bias of ±0.5 V, PM‐OPDs are enabled to operate with an EQE of 19560% and a detectivity of 2.8 × 10 13 Jones. The versatility of this mechanism is validated across three active layer combinations. Compared to commercial silicon photodetector, the flexible PM‐OPDs achieved a 139.3‐fold increase in photocurrent in photoplethysmography under faint light conditions. This work presents a promising strategy for developing bi‐directional biased PM‐OPDs with reduced power consumption while maintaining high gains for various practical applications.

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Identifikatorlar

DOI: 10.1002/adfm.202415142

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