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  

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

作　　者：张振宇 汪国平 ZHANG Zhenyu;WANG Guoping(Laboratory of Artificial Microstructure Optoelectronic Materials and Devices,College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China)

机构地区：[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

出　　处：《高等学校化学学报》2024年第12期124-132,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:62005183);国家重点研发计划项目(批准号:2022YFA1404500)资助.

摘　　要：借助空间限域法制备了毫米级的甲基碘化铅铵(MAPbI_(3))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MAPbI_(3)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1.7×10^(4)(动态线性区约84.6 dB),外量子效率为58.2%,比探测率约为6.3×10^(12) Jones(1 Jones=1 cm·Hz^(1/2)·W^(-1)).研究结果证实了利用FIB技术加工MAPbI_(3)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.In this paper,millimeter-sized CH_(3)NH_(3)PbI_(3)(MAPbI_(3))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 MAPbI_(3) SCSs.Specifically,the PD responsivity can reach 0.6 A/W,the on-off ratio can reach 1.7×10^(4)(the dynamic linear region is approximately 84.6 dB),the external quantum efficiency can reach 58.2%,and the specific detectivity is about 6.3×10^(12) Jones(1 Jones=1 cm·Hz^(1/2)·W^(-1)).The result demonstrates the high feasibility of FIB etching for processing the periodic structure on the surface of MAPbI_(3) SCSs,which will greatly contribute to the design and fabrication of high-performance near-infrared photodetectors based on perovskite single-crystal sheet.

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 

分 类 号：O649.4[理学—物理化学]