High‐Performance Broadband Multiplier‐Type Organic Photodetectors Based on Quaternary Heterojunctions

• DOI: 10.1002/admt.202500358
• Publication Date: 2025-05-02T03:54:50Z
• Authors: Xiaogang Chen; Aohuan Shi; Kailiang Bai; Nana Ren; Qin Zhou; Wenshu Chen; Yi Long; Yao Li; Feiping Lu

Abstract To enhance the near‐infrared detection capability and broaden response spectrum of single‐carrier‐transport‐based multiplication‐type organic photodetectors (PM‐OPDs), a quaternary heterojunction strategy based on double donors receptors is employed. The PM‐OPDs with configuration ITO/PEDOT:PSS/Active‐layer/Al are meticulously fabricated. experimental results revealed that optimized P3HT:PTB7‐Th:PC 61 BM:Y6 (40:60:3:2 wt/wt/wt/wt) achieved wide spectral from 300 to 980 nm. Under bias voltage −20 V illumination at 850 nm power density 1 mW cm −2 , optimal weight ratio following performance metrics: an external quantum efficiency 8555.89%, specific detectivity 6.36 × 10 11 Jones, responsivity 58.66 A/W, photocurrent gains 963.16%, noise equivalent 4.10 −13 W/Hz 1/2 . Such remarkable broad can be attributed introduction PTB7‐Th Y6, which enhanced photon capture, exciton dissociation, electron trapping abilities within active layer, as well creation cascaded energy levels facilitated more efficient carrier transport. This study provides feasible reference for developing fabricating high‐performance photodetectors.