Статья

Double-Layered Strategy for Broadband Photomultiplication-Type Organic Photodetectors and Achieving Narrowband Response in Violet, Red, and Near-Infrared Light

Ming LiuSchool of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, ChinaQunping FanDepartment of Chemistry, City University of Hong Kong, Kowloon 999077, Hongkong, ChinaJian WangCollege of Physics and Electronic Engineering, Taishan University, Taian 271000, Shandong Province, ChinaFrancis LinDepartment of Chemistry, City University of Hong Kong, Kowloon 999077, Hongkong, ChinaZijin ZhaoSchool of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, ChinaKaixuan YangSchool of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, ChinaXingchao ZhaoSchool of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, ChinaZhengji ZhouNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Henan University, Kaifeng 475004, Henan Province, ChinaAlex K.‐Y. JenDepartment of Chemistry, City University of Hong Kong, Kowloon 999077, Hongkong, ChinaFujun ZhangSchool of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China

2022en

ABI

Аннотация

Broadband photomultiplication-type organic photodetectors (PM-OPDs) were prepared with PMBBDT:PY3Se-2V (1:1, wt/wt) as the absorbing layer (AL) and PC71BM:P3HT (100:5, wt/wt) as the photomultiplication layer (PML) on the basis of the sandwich structure. The incident photons from ultraviolet light to the near-infrared region can be harvested by AL. The rather less P3HT in PML can produce plenty of isolated hole traps with P3HT surrounded by PC71BM; the electron tunneling injection induced by trapped holes near the Ag electrode can lead to the photomultiplication (PM) phenomenon. The performance of PM-OPDs can be effectively improved by optimizing the AL thickness. The optimal PM-OPDs exhibit a broad spectral response from 300 to 1050 nm as well as an external quantum efficiency (EQE) of 5800% at 340 nm at 10 V bias, along with a specific detectivity (D*) of 3.78 × 1013 Jones. The spectral response of PM-OPDs is controlled by the trapped-hole distribution near the Ag electrode, primarily originating from the photogenerated holes in AL. To further optimize the spectral response of PM-OPDs, the optical filter layer (OFL) was used to manipulate light field distribution in AL. The violet, red, and near-infrared-light PM-OPDs were developed by employing different OFLs.

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Идентификаторы

DOI: 10.1021/acsami.2c12154

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