Boosting Performance of ZnO/(Bi,Sb) 2 Se 3 Short‐Wavelength Infrared Photodetector via ZnTe Hole‐Transport Layer

作者：Ruisi Gao, Feifan Yang, Liang Li, Ling Lin, Lin Zhu, Jinian Hao, Chuanhao Li, Shuo Chen, Guangzu Zhang, Kanghua Li · 发表于：Advanced Optical Materials · 年份：2025 · DOI：10.1002/adom.202501610 · 被引用次数：1 · 研究领域：Chalcogenide Semiconductor Thin Films、Advanced Semiconductor Detectors and Materials、Perovskite Materials and Applications

Abstract Infrared photodetectors based on (Bi,Sb) 2 Se 3 alloys have attracted considerable attention owing to their tunable bandgaps and high carrier mobility, making them promising candidates for broadband detection. However, their performance is hindered by high dark current density and inefficient carrier extraction. Herein, ZnTe is introduced as a hole‐transport layer (HTL) to reconfigure the band structure and fabricate a high‐performance ZnO/(Bi,Sb) 2 Se 3 /ZnTe photodetector. By systematically tuning the ZnTe HTL thickness, a 53% enhancement in EQE (16.2% at 1300 nm) and a 50% reduction in dark current density (97.4 µA cm −2 , at −0.5 V) are achieved compared to HTL‐free devices. SCAPS simulation elucidates that the designed (Bi,Sb) 2 Se 3 /ZnTe heterojunction effectively suppresses electron backflow while enhancing hole extraction, thereby boosting performance. Therefore, the optimized device exhibits a notably fast response time (12/107.5 ns rise/fall) and a wide linear dynamic range (LDR, 96 dB). Additionally, unencapsulated devices retain 97.7% of their initial performance after 322 h of operating at 90 °C and withstand extreme annealing at 150°C, surpassing many state‐of‐the‐art detectors. This approach provides a scalable, low‐cost, and eco‐friendly strategy for developing high‐performance, high‐speed, and high‐stability infrared photodetection systems.