高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (12): 20240347.doi: 10.7503/cjcu20240347

• 物理化学 • 上一篇    下一篇

基于钙钛矿单晶片表面周期性结构的高性能近红外光探测器

张振宇(), 汪国平()   

  1. 深圳大学电子与信息工程学院,人工微结构光电材料与器件实验室,深圳 518060
  • 收稿日期:2024-07-10 出版日期:2024-12-10 发布日期:2024-09-23
  • 通讯作者: 张振宇,汪国平 E-mail:zhangzhenyu@szu.edu.cn;gpwang@szu.edu.cn
  • 基金资助:
    国家自然科学基金(62005183);国家重点研发计划项目(2022YFA1404500)

High-performance Near-infrared Photodetector Based on Surface Periodic Structure of the Perovskite Single-crystal Sheet

ZHANG Zhenyu(), WANG Guoping()   

  1. Laboratory of Artificial Microstructure Optoelectronic Materials and Devices,College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China
  • Received:2024-07-10 Online:2024-12-10 Published:2024-09-23
  • Contact: ZHANG Zhenyu, WANG Guoping E-mail:zhangzhenyu@szu.edu.cn;gpwang@szu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(62005183);the Key Project of the National Key Research and Development Program of China(No.2022YFA1404500)

摘要:

借助空间限域法制备了毫米级的甲基碘化铅铵(MAPbI3)单晶片, 并利用聚焦离子束刻蚀(FIB)技术在其表面加工周期性结构, 使其共振吸收峰调节至近红外波段, 基于此有源层构筑了纵向结构的光探测器. 相比于MAPbI3单晶片基器件, 该器件对双光子近红外光(1064 nm)的探测能力有近2个数量级的显著提高, 响应度达0.6 A/W, 开关比可达1.7×104(动态线性区约84.6 dB), 外量子效率为58.2%, 比探测率约为6.3×1012 Jones(1 Jones=1 cm·Hz1/2·W-1). 研究结果证实了利用FIB 技术加工 MAPbI3 单晶片表面周期性结构的高度可行性, 这将促进钙钛矿单晶片基高性能近红外光探测器的设计和制备.

关键词: 钙钛矿单晶片, 近红外光探测器, 聚焦离子束刻蚀, 共振吸收

Abstract:

In this paper, millimeter-sized CH3NH3PbI3(MAPbI3) single-crystal sheets(SCSs) were synthesized using the spatial confinement method, and the periodic structures were fabricated on the SCS surface by focused ion beam(FIB) etching technology, enabling the resonance absorption peak to be located in the near-infrared band. Based on this active layer, a longitudinal-structured photodetector(PD) was constructed. The detection capability of such device in the two-photon near-infrared light(1064 nm) was significantly enhanced by two orders of magnitude compared to the device based on pristine MAPbI3 SCSs. Specifically, the PD responsivity can reach 0.6 A/W, the on-off ratio can reach 1.7×104(the dynamic linear region is approximately 84.6 dB), the external quantum efficiency can reach 58.2%, and the specific detectivity is about 6.3×1012 Jones(1 Jones=1 cm·Hz1/2·W-1). The result demonstrates the high feasibility of FIB etching for processing the periodic structure on the surface of MAPbI3 SCSs, which will greatly contribute to the design and fabrication of high-performance near-infrared photodetectors based on perovskite single-crystal sheet.

Key words: Perovskite single-crystal sheet, Near-infrared photodetector, Focused ion beam etching, Resonance absorption

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