High-performance organic photodetector with optimized thick bulk-heterojunction for near-infrared sensing

Qingxia Liu; Huiling Tai; Yang Wang; Yuan Liu; Yadong Jiang

doi:10.1117/12.2603926

13 December 2021 High-performance organic photodetector with optimized thick bulk-heterojunction for near-infrared sensing

Qingxia Liu, Huiling Tai, Yang Wang, Yuan Liu, Yadong Jiang

Author Affiliations +

Proceedings Volume 12074, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Novel Optoelectronic Functional Materials and Devices; 1207407 (2021) https://doi.org/10.1117/12.2603926
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Reducing the dark current density (J_d) of organic photodetectors (OPD) is an effective way to improve some important figures of merits such as on-off ratio and specific detectivity (D*). Many studies have demonstrated that increasing the thickness of the active layer can effectively reduce the J_d of OPD, but at the same time it can cause a sharp decrease in responsivity and external quantum efficiency (EQE). In this work, a preheating spin coating method was used on the thick bulk-heterojunction (BHJ) active layer, which is composed of a polymer donor PBDB-T and a non-fullerene acceptor (NFA) Y6 with near-infrared (NIR) absorption. As a result, the thick BHJ OPD maintains a low J_d while the responsivity and EQE are greatly improved, therefore the optimized devices display a high D* over 10¹² Jones at -0.5 V from 400 nm to 900 nm, indicating its application potential in visible-to-NIR detection. This work provides an effective strategy to enhance the performance of thick BHJ devices.

Citation Download Citation

Qingxia Liu, Huiling Tai, Yang Wang, Yuan Liu, and Yadong Jiang "High-performance organic photodetector with optimized thick bulk-heterojunction for near-infrared sensing", Proc. SPIE 12074, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Novel Optoelectronic Functional Materials and Devices, 1207407 (13 December 2021); https://doi.org/10.1117/12.2603926

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KEYWORDS

Photodetectors

External quantum efficiency

Absorption

Coating

Near infrared

Polymers

Optoelectronics

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