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Role of A‐Site Composition in Charge Transport in Lead Iodide Perovskites

Hong, Min Ji; Labram, John G; (2022) Role of A‐Site Composition in Charge Transport in Lead Iodide Perovskites. Advanced Energy and Sustainability Research , Article 2200120. 10.1002/aesr.202200120. (In press). Green open access

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Abstract

As the power conversion efficiency and stability of solar cells based on metal halide perovskites continue to improve, the community increasingly relies on compounds formed of mixed cations and mixed halides for the highest performing devices. The result is that device engineers now have a potentially infinite number of compositions to choose from. While this has provided a large scope for optimization, it has increased complexity of the field, and the rationale for choosing one composition over another remains somewhat empirical. Herein, the distribution of electronic properties for a range of lead iodide perovskite thin films is mapped. The relative percentages of methylammonium, formamidinium, and cesium are varied, and the electronic properties are measured with time-resolved microwave conductivity, a contactless technique enabling extraction of electronic properties of isolated films of semiconductors. It is found a small amount of Cs leads to larger carrier mobilities and longer carrier lifetimes and that compositions with a tolerance factor close to 0.9 generally show lower performance that those closer to 0.8 or 1.0.

Type: Article
Title: Role of A‐Site Composition in Charge Transport in Lead Iodide Perovskites
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/aesr.202200120
Publisher version: https://doi.org/10.1002/aesr.202200120
Language: English
Additional information: © 2022 The Authors. Advanced Energy and Sustainability Research published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10156559
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