Exploring halide perovskites in macroscopic world through microscopic techniques Daniel Abou-Ras 1 , Dan Wargulski 1 , Ke Xu 1 , Tal Binyamin 2 and Benedikt Haas 3 , 1 Helmholtz-Zentrum Berlin, Germany, 2 Hebrew University Jerusalem, Israel 3 Department of Physics &; IRIS Adlershof, Humboldt-Universität zu Berlin, Germany Mixed-halide perovskites are a very customizable group of materials. The possibility to change their bandgap energy by adjusting the ratios of halides renders them a promising class of semiconductors. These materials hold great promise for photovoltaics, but understanding their behavior is key. Using correlative electron microscopy, we peered into the microscopic world of triple-halide perovskite thin films and solar cells [1] and discovered that PbI 2 precipitates were lurking at the interface between the perovskite and electron transport layers, hindering device performance. We also explored the local bandgap energies of inorganic CsPb(I 1-x Br x ) 3 nanoparticles, finding that macroscopic results arise from a large number of nanocrystals with varying compositions and bandgap energies. This study bridges the gap between the microscopic and macroscopic worlds of mixed-halide perovskites, providing important insights into the structure-property relationships of these fascinating materials. By correlating various techniques in scanning electron microscopy with solar-cell parameters, optical measurements, and structural analyses by means of X-ray diffraction, we were able to gain a deeper understanding of these materials and their potential for photovoltaic applications. References 1. Xu, K.; Al-Ashouri, A.; Peng, Z. W.; Köhnen, E.; Hempel, H.; Akhundova, F.; Marquez, J. A.; Tockhorn, P.; Shargaieva, O.; Ruske, F.; Zhang, J.; Dagar, J.; Stannowski, B.; Unold, T.; Abou-Ras, D.; Unger, E.; Korte, L.; Albrecht, S. Slot-Die Coated Triple-Halide Perovskites for Efficient and Scalable Perovskite/Silicon Tandem Solar Cells. ACS Energy Lett. 2022 , 7 (10), 3600–3611.
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