TY - JOUR

T1 - On the Shape-Selected, Ligand-Free Preparation of Hybrid Perovskite (CH3NH3PbBr3) Microcrystals and Their Suitability as Model-System for Single-Crystal Studies of Optoelectronic Properties

AU - Bahnmüller, Ulrich Johannes

AU - Kuper, Henning

AU - Seewald, Tobias

AU - Yalcinkaya, Yenal

AU - Becker, Jörg August

AU - Schmidt-Mende, Lukas

AU - Weber, Stefan A. L.

AU - Polarz, Sebastian

N1 - Funding Information: This research was funded by the Deutsche Forschungsgemeinschaft (DFG), SPP2196.

PY - 2021/11/13

Y1 - 2021/11/13

N2 - Hybrid perovskite materials are one of the most promising candidates for optoelectronic applications, e.g., solar cells and LEDs, which can be produced at low cost compared to established materials. Although this field of research has seen a huge upsurge in the past decade, there is a major lack in understanding the underlying processes, such as shape-property relationships and the role of defects. Our aerosol-assisted synthesis pathway offers the possibility to obtain methylammonium lead bromide (MAPbBr3) microcrystals from a liquid single source precursor. The differently shaped particles are aligned on several substrates, without using a directing agent or other additives. The obtained particles show good stability under dry conditions. This allows us to characterize these materials and their pure surfaces at the single-crystal level using time- and spatially resolved methods, without any influences of size-dependent effects. By optimizing the precursor for the aerosol process, we were able to eliminate any purification steps and use the materials as processed. In addition, we performed theoretical simulations to deepen the understanding of the underlying processes in the formation of the different crystal facets and their specific properties. The model system presented provides insights into the shape-related properties of MAPbBr3 single crystals and their directed but ligand-free synthesis.

AB - Hybrid perovskite materials are one of the most promising candidates for optoelectronic applications, e.g., solar cells and LEDs, which can be produced at low cost compared to established materials. Although this field of research has seen a huge upsurge in the past decade, there is a major lack in understanding the underlying processes, such as shape-property relationships and the role of defects. Our aerosol-assisted synthesis pathway offers the possibility to obtain methylammonium lead bromide (MAPbBr3) microcrystals from a liquid single source precursor. The differently shaped particles are aligned on several substrates, without using a directing agent or other additives. The obtained particles show good stability under dry conditions. This allows us to characterize these materials and their pure surfaces at the single-crystal level using time- and spatially resolved methods, without any influences of size-dependent effects. By optimizing the precursor for the aerosol process, we were able to eliminate any purification steps and use the materials as processed. In addition, we performed theoretical simulations to deepen the understanding of the underlying processes in the formation of the different crystal facets and their specific properties. The model system presented provides insights into the shape-related properties of MAPbBr3 single crystals and their directed but ligand-free synthesis.

KW - Aerosol synthesis

KW - Hybrid perovskites (HYPE)

KW - Methylammonium lead bromide

KW - Optoelectronic properties of MAPbBr

KW - Shape-related properties

UR - http://www.scopus.com/inward/record.url?scp=85118921713&partnerID=8YFLogxK

U2 - 10.3390/nano11113057

DO - 10.3390/nano11113057

M3 - Article

VL - 11

JO - Nanomaterials

JF - Nanomaterials

SN - 2079-4991

IS - 11

M1 - 3057

ER -