关键词: 微波光电导, 实验条件, 灵敏度, 载流子复合, 空穴转移效率

Abstract: Microwave photoconductivity technology can obtain the carrier recombination dynamic process of semiconductor materials, and provides a reference for the synthesis of semiconductor materials and the preparation of devices. In order to improve the accuracy of the microwave photoconductivity measurement system in open cell mode, influences of various experimental conditions, including excitation light energy, open circuit and short circuit conditions, distance between sample and short circuit end, excitation wavelength, were analyzed. The experimental results show that microwave photocunductance measurement in short circuit conditions can suppress the “oscillation” of photoconductance signal, when the sample thickness approximates with carrier diffusion length. Optimizing the distance between the sample and the short-circuit end can enhance the sensitivity of measurement. CH₃NH₃PbI₃/PTAA(PTAA-polymer polytriarylamine)was characterized as a standard sample, and its hole transfer efficienies were about 84.1% and 59.1% after excitation by 532 nm and 355 nm, respectively. The results of this research are beneficial for the application of microwave photoconductivity technology in diagnoses of carrier recombination and interface charge transfer.

Key words: microwave photoconductivity, experimental conditions, sensitivity, carrier recombination, hole transfer efficiency