Journal of Hebei University(Natural Science Edition) >

2022 , Vol. 42 >Issue 1: 22 - 28

DOI: https://doi.org/10.3969/j.issn.1000-1565.2022.01.004

Measurement method and application of microwave photoconductivity in open cell mode

  • NIU Ben ,
  • TAO Tingting ,
  • HUANG Hao ,
  • WANG Tao ,
  • DANG Wei ,
  • DING Wenge
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  • College of Physics Science and Technology, Hebei University, Baoding 071002, China

Received date: 2021-04-29

  Online published: 2022-02-22

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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

Cite this article

NIU Ben , TAO Tingting , HUANG Hao , WANG Tao , DANG Wei , DING Wenge . Measurement method and application of microwave photoconductivity in open cell mode[J]. Journal of Hebei University(Natural Science Edition), 2022 , 42(1) : 22 -28 . DOI: 10.3969/j.issn.1000-1565.2022.01.004

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