Ruisi Gao, Feifan Yang, Liang Li, Ling Lin, Lin Zhu, Jinian Hao, Chuanhao Li, Shuo Chen, Guangzu Zhang, Kanghua Li
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引用次数: 0
摘要
基于(Bi,Sb)2Se3合金的红外光电探测器由于其可调谐的带隙和高载流子迁移率而引起了广泛的关注,使其成为宽带探测的有希望的候选者。然而,它们的性能受到暗电流密度高和载流子提取效率低的制约。本文将ZnO/(Bi,Sb)2Se3/ZnTe光电探测器作为空穴传输层(HTL)引入ZnO/(Bi,Sb)2Se3/ZnTe光电探测器。通过系统地调整ZnTe HTL厚度,与无html器件相比,EQE提高了53%(在1300 nm时提高了16.2%),暗电流密度降低了50%(在- 0.5 V时降低了97.4 μ a cm - 2)。SCAPS仿真结果表明,所设计的(Bi,Sb)2Se3/ZnTe异质结有效抑制了电子回流,同时增强了空穴提取,从而提高了性能。因此,优化后的器件具有显著的快速响应时间(12/107.5 ns上升/下降)和宽线性动态范围(LDR, 96 dB)。此外,未封装的器件在90°C下工作322小时后仍能保持97.7%的初始性能,并能承受150°C的极端退火,超过了许多最先进的探测器。这种方法为开发高性能、高速和高稳定性的红外光探测系统提供了一种可扩展、低成本和环保的策略。
Boosting Performance of ZnO/(Bi,Sb)2Se3 Short-Wavelength Infrared Photodetector via ZnTe Hole-Transport Layer
Infrared photodetectors based on (Bi,Sb)2Se3 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)2Se3/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)2Se3/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.
期刊介绍:
Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.