Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.127
Publication date: 11th July 2022
The use of layered, 2D perovskites can greatly improve the stability of metal halide perovskite thin films and devices. However, the charge carrier transport properties in layered perovskites are still not fully understood. We investigated the sum of the electron and hole mobilities (Σμ) in thin films of the 2D perovskite PEA2PbI4, through transient electronically contacted nanosecond-to-millisecond photoconductivity measurements, which are sensitive to long-time, long-range (micrometer length scale) transport processes. After careful analysis, accounting for both early-time recombination and the evolution of the exciton-to-free-carrier population, a long-range mobility of 8.0 +/− 0.6 cm2 (V s)–1, which is ten times greater than the long-range mobility of a comparable 3D material FA0.9Cs0.1PbI3 is determined. These values are compared to ultra-fast transient time-resolved THz photoconductivity measurements, which are sensitive to early-time, shorter-range (tens of nm length scale) mobilities. Mobilities of 8 and 45 cm2 (V s)–1 in the case of the PEA2PbI4 and FA0.9Cs0.1PbI3, respectively, are obtained. This previously unreported concurrence between the long-range and short-range mobility in a 2D material indicates that the polycrystalline thin films already have single-crystal-like qualities. Hence, their fundamental charge carrier transport properties should aid device performance, while keeping the benefits for stability as well.
Adapted from [1]
This work was part funded by EPSRC, UK under EP/S004947/1
and EP/V010840/1. Financial support by the DFG via SPP2196
Priority Program (CH 1672/3-1) is gratefully acknowledged. J.L. was
partially supported by the National Research Foundation of Korea
(NRF-2021M3H4A1A02057007). The research leading to these results
had received funding from the European Union’s Horizon 2020 research
and innovation program under grant agreement no. 764787 of the
MAESTRO project.
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