4.6 Article

Low-frequency carrier kinetics in triple cation perovskite solar cells probed by impedance and modulus spectroscopy

期刊

ELECTROCHIMICA ACTA
卷 386, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138430

关键词

Carrier kinetics; Triple cation perovskite solar cells; Impedance; Modulus spectroscopy

资金

  1. UGC Research Fellowship
  2. Cambridge Materials Limited
  3. Royal Society [RGS\R1\211068]
  4. EPSRC
  5. Royal Society Alumni Fellowship, SERB Project [SRG/2020/001641]
  6. DAE Government of India
  7. Ministry of Electronics and Information technology [DIC-1377-PHY]
  8. Wolfson College
  9. University of Cambridge

向作者/读者索取更多资源

In this study, the low-frequency carrier kinetics of organometallic halide perovskite-based solar cells were investigated. It was found that the dielectric permittivity showed a strong frequency dependence with dielectric relaxation, indicating localized charge carrier relaxation and hopping processes in these high-efficiency perovskite photovoltaics.
Organometallic halide perovskites-based solar cells have emerged as next-generation photovoltaic technology. However, many of its intriguing optoelectronic properties at low frequency are highly debated. Here, we investigate the low-frequency carrier kinetics of the state-of-the-art triple cation perovskite Cs(0.06)FA (0.79)MA(0.15)Pb(I0.85Br0.15)(3) solar cells using bias-dependent impedance and modulus spectroscopy under dark and illumination conditions. We observe a strong dependence of dielectric permittivity on frequency in 1 Hz to 1 MHz region with a dielectric relaxation, which is observed to follow the MaxwellWagner type interfacial polarization possibly originating from the grain boundary/ionic defects. Furthermore, correlating the impedance and modulus spectra reveals the localized charge carrier relaxation in this triple cation device from which we obtain a phenomenological picture of the hopping process and developing an understanding of the charge carrier kinetics in these high-efficiency perovskite photovoltaics. (C) 2021 Published by Elsevier Ltd.

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