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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 57: Hybrid Perovskite and Photovoltaics I (joint session CPP/HL)

CPP 57.1: Vortrag

Mittwoch, 18. März 2020, 09:30–09:45, ZEU 260

Growth of High-quality (FAPbI ₃ ) _0.9 (MAPbBr ₃ ) _0.1 Perovskite Single Crystals and their Optoelectronic Properties — •Julian Höcker¹, Mathias Fischer¹, Mehmet Özcan², Benedikt Bichler², Sebastian Hammer¹, Melina Armer¹, Volker Drach¹, Bert Nickel², and Vladimir Dyakonov¹ — ¹Experimental Physics VI, JMU, 97074 Würzburg — ²Soft Condensed Matter Group, LMU, 80539 München

Organo lead trihalide perovskites are potentially highly interesting class of semiconductors. Particularly the perovskite (FAPbI ₃ ) _0.9 (MAPbBr ₃ ) _0.1 is one of the most important representatives of this material class. In order to further develop this complex perovskite system and thus foster its use, it is essential to investigate the chemical and physical properties of high-quality single crystals with the same stoichiometry. However, the liquid growth of perovskite crystals without seed crystals is usually challenging and becomes even more challenging with mixed cations/halides crystals, making it difficult to assess their properties. For this purpose, we have developed a new efficient re-fill crystallization method (RFCM) based on the Inverse Temperature Crystallization (ITC), which avoids seed crystals. We applied qualitative and quantitative analyses to identify the elemental composition and the exact stoichiometry of the grown crystals and studied their crystallographic properties, demonstrating a high single crystal quality. Optical and electrical measurements completed the structural and elemental analysis, and enabled us to derive relevant properties of this perovskite material.