Influence of Charge Transport Layers on Capacitance Measured in Halide Perovskite Solar Cells

Rasha A. Awni, Zhaoning Song, Cong Chen, Chongwen Li, Changlei Wang, Mohammed A. Razooqi, Lei Chen, Xiaoming Wang, Randy J. Ellingson, Jian V. Li, Yanfa Yan

研究成果: Article

摘要

Capacitance-based techniques have been used to measure the electrical properties of halide perovskite solar cells (PSCs) such as defect activation energy and density, carrier concentration, and dielectric constant, which provide key information for evaluating the device performance. Here, we show that capacitance-based techniques cannot be used to reliably analyze the properties of defects in the perovskite layer or at its interface, because the high-frequency capacitance signature is due to the response of charge carriers in the hole-transport layer (HTL). For HTL-free PSCs, high-frequency capacitance can be considered as the geometric capacitance for analyzing the dielectric constant of the perovskite layer because there is no trapping and de-trapping of charge carriers in the perovskite layer. We further find that the low-frequency capacitance signature can be used to calculate the activation energy of the ionic conductivity of the perovskite layer, but the overlapping effects with charge transport materials must be avoided.

原文English
頁(從 - 到)644-657
頁數14
期刊Joule
4
發行號3
DOIs
出版狀態Published - 2020 三月 18

All Science Journal Classification (ASJC) codes

  • Energy(all)

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  • 引用此

    Awni, R. A., Song, Z., Chen, C., Li, C., Wang, C., Razooqi, M. A., Chen, L., Wang, X., Ellingson, R. J., Li, J. V., & Yan, Y. (2020). Influence of Charge Transport Layers on Capacitance Measured in Halide Perovskite Solar Cells. Joule, 4(3), 644-657. https://doi.org/10.1016/j.joule.2020.01.012