基于模板剥离法制备高性能钙钛矿单晶薄膜光电探测器  

Template Stripping Method for High-performance Perovskite Single-crystalline Thin-film Photodetectors

作　　者：单东明 张瀚文 张庆文 张虎 丁然[1] SHAN Dongming;ZHANG Hanwen;ZHANG Qingwen;ZHAGN Hu;DING Ran(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学电子科学与工程学院,集成光电子学国家重点实验室,吉林长春130012

出　　处：《发光学报》2024年第2期195-203,共9页Chinese Journal of Luminescence

基　　金：国家重点研发计划青年科学家项目(2022YFB3607500);国家自然科学基金(62274076)。

摘　　要：近年来,杂化钙钛矿半导体材料由于其带隙可调、吸收系数高、载流子迁移率高、成本低廉等诸多优点,在光电器件领域备受青睐,如太阳能电池、电致发光器件、光电探测器等。其中,钙钛矿单晶薄膜因其无晶界、杂质和缺陷含量低等特点,展现出更为优异的光学、电学特性,成为制备高性能光电器件的理想材料体系。然而,钙钛矿单晶薄膜常采用空间限域法直接生长在空穴传输层上,不可避免地将导致界面缺陷和载流子层间输运等问题,严重制约了钙钛矿单晶薄膜光电探测器的性能。为此,本文通过引入模板剥离法工艺技术,在钙钛矿单晶薄膜两侧分别蒸镀功能层材料,制备了结构为Cu/BCP/C_(60)/MAPbBr_(3)/MoO_(3)/Ag的钙钛矿单晶薄膜光电探测器。基于模板剥离法,两侧蒸镀的功能层与钙钛矿单晶薄膜接触紧密,将有效改善载流子的注入和传输;同时,优化的器件结构以及考虑能带匹配等因素可实现高灵敏、响应快速的钙钛矿单晶薄膜光电探测器。改进后器件的开关比高达3.1×10^(3),响应度可达7.15 A/W,探测率为5.39×10^(12)Jones,外量子效率达到1794%。该工作为进一步改善和提升钙钛矿单晶薄膜光电探测器的探测性能提供了一种可行性技术方案。Hybrid perovskite semiconductors have attracted enormous interest in the field of optoelectronic devices for creating high-performance solar cells,light-emitting diodes,and photodetectors owing to their tunable narrow band gap,high optical absorption,high charge-carrier mobility,and low cost,etc.Among them,perovskite single-crystalline thin-films show greater promise as an ideal matrix for optoelectronic applications because of their absence of grain boundaries,lower impurity,and lower defect densities.The space-confined method was usually used for the growth of perovskite single-crystalline thin-films,where a polymer hole-transport layer was employed to accelerate the ion diffusion.However,this solution-processed method will inevitably bring in the interfacial defects and induce poor charge-carrier injection between the perovskite single-crystalline thin-film and hole-transport layer.Herein,we introduced the template stripping method to solve this problem that enables direct thermal-deposition onto two sides of the perovskite single-crystalline thin-film.A novel perovskite single-crystalline thin-film photodetector can be con‐structed by a device structure of Cu/BCP/C_(60)/MAPbBr_(3)/MoO_(3)/Ag.Then,an ultrasensitive and fast perovskite single-crystalline thin-film photodetector can be realized with an on-off ratio of 3.1×10^(3),a responsivity up to 7.15 A/W,a detectivity of 5.39×10^(12) Jones,and an external quantum efficiency of 1794%,due to the optimal device structure and improved charge-carrier transport.These results indicate that the template stripping method provides a feasible approach to further improve the performance of perovskite single-crystal photodetectors.

关 键 词：杂化钙钛矿半导体材料 钙钛矿单晶薄膜 模板剥离法 光电探测器 

分 类 号：O482.31[理学—固体物理] TN304[理学—物理]