Study of DC Conductivity, Complex Impedance, and Photodetection Characteristics of CsPbI₃

Hiral Patel; Piyush Vyas

doi:10.69980/redvet.v25i1S.2451

Hiral Patel Chemistry Department, Amity University, Gwalior-474005, Madhya Pradesh, India
Piyush Vyas Chemistry Division, Sheth M. N. Science College, Patan-384265, Gujarat, India

DOI: https://doi.org/10.69980/redvet.v25i1S.2451

Keywords: CsPbI₃, Perovskite, Dielectric properties, Impedance spectroscopy, Optoelectronic properties, Photo detector

Abstract

Cesium lead iodide (CsPbI₃) is an inorganic halide perovskite that has attracted significant attention due to its excellent optoelectronic properties and potential applications in photovoltaic and photodetection devices. In the present work, CsPbI₃ was synthesized and systematically investigated through DC electrical conductivity, complex impedance spectroscopy, and photodetection studies. Structural and morphological analyses confirmed the formation of the perovskite phase with well-defined crystalline features. The DC conductivity measurements were carried out over a wide temperature range to understand the charge transport mechanism. The conductivity was found to increase with temperature, indicating semiconducting behavior and thermally activated charge carrier transport. Complex impedance analysis revealed the contribution of grains and grain boundaries to the overall electrical response, while the temperature-dependent impedance spectra demonstrated a decrease in bulk resistance with increasing temperature. The frequency-dependent dielectric and impedance parameters further supported the enhanced mobility of charge carriers at elevated temperatures. Photodetection measurements under light illumination showed a significant increase in photocurrent compared to the dark current, confirming the excellent photoresponsive nature of CsPbI₃. The material exhibited high photosensitivity and stable photoresponse, highlighting its suitability for photodetector applications. The combined electrical and optoelectronic investigations demonstrate that CsPbI₃ is a promising candidate for next-generation semiconductor and optoelectronic devices.

References

1.Abney, M. K. (2022). Photoluminescence and stability of perovskite-phase CsPbI₃ nanocrystals and development of nickel metal-organic decomposition inks (Doctoral dissertation).
2.Thomas, C. J. (2018). Surface functionalization of CuInSe₂ and CsPbI₃ nanocrystals: conversion yields, exciton kinetics, and thermal stability (Doctoral dissertation).
3.Limpamanoch, P., Rujisamphan, N., Kumnorkaew, P., Amornkitbamrung, V., Tang, I. M., Zhang, Q., & Supasai, T. (2019). Understanding Effects of Cesium in CH (NH₂) ₂PbI₃ for Stabilizing CH (NH₂) ₂PbI₃/CsPbI₃ Interface under UV Illumination.
4.Zhang, Q., Song, Y. H., Hao, J. M., Lan, Y. F., Feng, L. Z., Ru, X. C., ... & Yao, H. B. (2022). α-BaF₂ Nanoparticle Substrate-Enabled γ-CsPbI₃ Heteroepitaxial Growth for Efficient and Bright Deep-Red Light-Emitting Diodes.
5.Yao, Z., Zhao, W., & Liu, S. F. (2021). Stability of the CsPbI 3 perovskite: from fundamentals to improvements. Journal of Materials Chemistry A, 9(18), 11124-11144.
6.Wang, Y., Liu, X., Zhang, T., Wang, X., Kan, M., Shi, J., & Zhao, Y. (2019). The role of dimethylammonium iodide in CsPbI3 perovskite fabrication: additive or dopant?. Angewandte Chemie, 131(46), 16844-16849.
7.Ahmad, W., Khan, J., Niu, G., & Tang, J. (2017). Inorganic CsPbI3 perovskite‐based solar cells: A choice for a tandem device. Solar Rrl, 1(7), 1700048.
8.Swarnkar, A., Marshall, A. R., Sanehira, E. M., Chernomordik, B. D., Moore, D. T., Christians, J. A., ... & Luther, J. M. (2016). Quantum dot–induced phase stabilization of α-CsPbI3 perovskite for high-efficiency photovoltaics. Science, 354(6308), 92-95.
9.Chang, X., Fang, J., Fan, Y., Luo, T., Su, H., Zhang, Y., ... & Zhao, K. (2020). Printable CsPbI3 perovskite solar cells with PCE of 19% via an additive strategy. Advanced Materials, 32(40), 2001243.
10.Haque, F., Wright, M., Mahmud, M. A., Yi, H., Wang, D., Duan, L., ... & Uddin, A. (2018). Effects of hydroiodic acid concentration on the properties of CsPbI3 perovskite solar cells. ACS omega, 3(9), 11937-11944.
11.Zhang, T., Dar, M. I., Li, G., Xu, F., Guo, N., Grätzel, M., & Zhao, Y. (2017). Bication lead iodide 2D perovskite component to stabilize inorganic α-CsPbI3 perovskite phase for high-efficiency solar cells. Science advances, 3(9), e1700841.
Wang, Y. K., Yuan, F., Dong, Y., Li, J. Y., Johnston, A., Chen, B., ... & Sargent, E. H. (2021). All‐inorganic quantum‐dot LEDs based on a