Temperature Dependent Charge Carrier Recombination in Organic Metal Halide Perovskite Photodetectors

有机金属卤化物(OMH)钙钛矿是非常有前途的高响应和高灵敏度近红外光电探测器的候选材料，可以完全从溶液中处理。然而，对于钙钛矿型光电探测器来说，与温度相关的晶体相变和离子迁移率的影响仍然相对未知，这些因素有望通过各种手段影响载流子复合和时间动力学。因此，申请人的目标是开发对基于FA(X)MA(1−X)PbI3的光电探测器的这些现象的基本理解，特别是在与器件操作相关的温度范围内。该项目分为三个主要目标：(I)申请者将在斯旺西大学新的实验室环境中根据钙钛矿型太阳能电池的初步工作建立钙钛矿型光电探测器的制造路线。(2)一旦这一过程产生了可重复的器件，集成半导体材料中心的广泛表征基础设施将使研究钙钛矿型光电探测器中依赖温度的复合动力学成为可能。(3)在实验结果的基础上，最终目标是开发和验证一个综合的模型，用于研究OMH钙钛矿微结构与陷阱介导的复合动力学之间的关系。尽管这一最终目标确实雄心勃勃，但申请者和梅雷迪斯教授团队之前的工作结合在一起，保证了很好的成功机会。

Organic metal halide (OMH) perovskites are very promising candidates for highly responsive and sensitive near infrared photodetectors that can be processed fully from solution. Yet, the influence of temperature dependent crystalline phase transitions and ionic mobility that by all means are expected to affect charge carrier recombination and temporal dynamics is still relatively unknown for perovskite photodetectors. Thus, the applicant aims at the development of a fundamental understanding of these phenomena for FA(X)MA(1−X)PbI3-based photodetectors, particularly in the temperature range that is relevant for device operation. The project is divided into three main objectives: (i) The applicant will establish a perovskite photodetector fabrication route in the new lab environment at Swansea University based on preliminary work on perovskite solar cells. (ii) As soon as this process yields reproducible devices, the extensive characterization infrastructure of the Centre for Integrative Semiconductor Materials (CISM) will allow the investigation of temperature dependent recombination dynamics in perovskite photodetectors. (iii) Based on the experimental findings, the final objective is the development and verification of a comprehensive model for the correlation of OMH perovskite microstructure and trap-mediated recombination dynamics. Although this final objective is certainly ambitious, the combination of previous work of both the applicant and the group of Prof. Meredith warrants good chances of success.