Boosting the Performance of Epitaxial Perovskite Microstructures by Surface Passivation

Zhou S, Rehm V, Grizfeld R, Liu Z, Han Y, Hrbek T, Matolínová I, Korczak J, Szczerbakow A, Story T, Kot M, Loi MA, Peng Z, Sotome M, Kondo T, Forberich K, Lüer L, Brabec C, Mergheim J, Heiß W (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Advanced Optical Materials Wiley

Book Volume: 14

Article Number: e03210

Journal Issue: 1

DOI: 10.1002/adom.202503210

Abstract

Epitaxial growth enables the fabrication of films and heterostructures with exceptional properties, particularly when performed on single-crystalline substrates with a suitable lattice type and lattice parameters. While epitaxial growth is extensively utilized for conventional semiconductors, epitaxial micro- and nanostructures of lead-halide perovskites have also been successfully obtained through vapor-phase and liquid-phase deposition techniques. Surface passivation, widely employed in polycrystalline perovskite films and single crystals to suppress surface recombination of charge carriers, is often overlooked for epitaxial structures due to the presumption that their inherently smooth surfaces are free of defects. In this study, surface passivation agents commonly used in colloidal nanocrystal chemistry are investigated, such as trioctylphosphine oxide (TOPO), or protective matrices like poly (methyl methacrylate) (PMMA), to improve the performance of epitaxially grown Formamidinium lead bromide (FAPbBr3) and Cesium lead bromide (CsPbBr3) micro- and nanostructures. These findings reveal that surface passivation significantly boosts luminescence intensity and decay times, reduces lasing thresholds to record-low levels for microcrystalline perovskite lasers, and enhances the specific detectivity of photoconductors. These advancements are consistent across structures grown by both vapor deposition and solution processing. This study highlights the critical role of surface passivation for achieving the full potential of epitaxially grown perovskite structures, thereby paving the way for advanced optoelectronic applications.

Authors with CRIS profile

Shuyu Zhou Department Werkstoffwissenschaften Viktor Rehm Institute Materials for Electronics and Energy Technology (i-MEET) Yufei Han Department Werkstoffwissenschaften Zijian Peng Institute Materials for Electronics and Energy Technology (i-MEET) Karen Forberich Institute Materials for Electronics and Energy Technology (i-MEET) Larry Lüer Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) Julia Mergheim Lehrstuhl für Technische Mechanik (LTM) Wolfgang Heiß Professur für Werkstoffwissenschaften (lösungsprozessierte Halbleitermaterialien)

Involved external institutions

University of Tokyo JP Japan (JP) Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) Institute of Physics Polish Academy of Sciences / Instytut Fizyki Polskiej Akademii Nauk (IF PAN) PL Poland (PL) University of Groningen / Rijksuniversiteit Groningen NL Netherlands (NL)

How to cite

APA:

Zhou, S., Rehm, V., Grizfeld, R., Liu, Z., Han, Y., Hrbek, T.,... Heiß, W. (2025). Boosting the Performance of Epitaxial Perovskite Microstructures by Surface Passivation. Advanced Optical Materials, 14(1). https://doi.org/10.1002/adom.202503210

MLA:

Zhou, Shuyu, et al. "Boosting the Performance of Epitaxial Perovskite Microstructures by Surface Passivation." Advanced Optical Materials 14.1 (2025).

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