Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Perovskite and Photovoltaics 2

CPP 19.5: Talk

Wednesday, September 7, 2022, 10:45–11:00, H38

Temperature-reduced and rapid growth of hybrid perovskite single crystals — •Julian Höcker^{1, 2}, Felix Brust¹, Melina Armer¹, and Vladimir Dyakonov¹ — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg, Germany — ²Experimental Physics - Soft Condensed Matter, Ludwig Maximilian University of Munich, 80539 Munich, Germany

Organolead trihalide perovskite single crystals are gaining more and more interest in the field of semiconductor research since they can be used for a variety of technical applications, like photodetectors or solar cells. To date, exclusively solution-processed perovskite crystals have been used for the fabrication of such device prototypes. A supersaturated perovskite solution is caused either by a temperature change, solvent evaporation, chemical reaction, or a combination of the methods. The aim of the various processes is to achieve rapid growth of crystals with controlled structure, size, shape, and yield. In addition, the crystalline components must exhibit high physical and chemical qualities to be applied as semiconducting components. However, these high requirements and numerous criteria cannot always be fully met by standard techniques like inverse temperature crystallisation. In order to grow large-sized OLTP single crystals in a controlled and simple manner from solution in the shortest possible time, we developed a crystallisation process based on primary alcohols. As a result, the blends based on perovskite precursor solution and alcohols lead to a significant reduction in their retrograde solubility and enable a temperature-reduced crystallisation pathway to grow single crystals.