Epitaxial inorganic metal-halide perovskite films with controlled surface terminations

Rieger J, Kißlinger T, Raabgrund A, Hauner J, Niesner D, Schneider MA, Fauster T (2023)

Publication Type: Journal article

Publication year: 2023


Original Authors: Janek Rieger, Tilman Kißlinger, Andreas Raabgrund, Jonas Hauner, Daniel Niesner, M. Alexander Schneider, Thomas Fauster

Book Volume: 7

Article Number: 035403

Issue: 3

DOI: 10.1103/PhysRevMaterials.7.035403


Metal-halide perovskite (MHP) thin films for next-generation solar cells are typically fabricated by wet-chemical synthesis in which surface properties such as the orientation of surface facets and their termination cannot be controlled. MHP device efficiencies depend critically on those surface properties. We demonstrate the epitaxial growth of several nanometer thick purely (001)-orientated films of CsPbBr3 and CsSnBr 3 MHPs on Au(001) by molecular beam epitaxy. The epitaxial films are in a cubic phase aligned with the substrate. Their surfaces are singly terminated and can be modified for the first time. While the CsBr and PbBr2 surface terminations differ in terms of their atomic structure and defect content, the films are intrinsic semiconductors irrespective of the termination. The work function of the PbBr2-terminated surface is increased by 0.7eV, which has drastic implications for the level alignment at MHP interfaces.

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Rieger, J., Kißlinger, T., Raabgrund, A., Hauner, J., Niesner, D., Schneider, M.A., & Fauster, T. (2023). Epitaxial inorganic metal-halide perovskite films with controlled surface terminations. Physical Review Materials, 7. https://doi.org/10.1103/PhysRevMaterials.7.035403


Rieger, Janek, et al. "Epitaxial inorganic metal-halide perovskite films with controlled surface terminations." Physical Review Materials 7 (2023).

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