Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 80: Hybrid and Perovskite Photovoltaics IV (Joint session of CPP, DF, DS and HL, organized by HL)

HL 80.1: Vortrag

Donnerstag, 10. März 2016, 14:45–15:00, H2

Synthesis of perfectly oriented and micrometer-sized MAPbBr3 perovskite crystals for thin film photovoltaic applications — •Nadja Giesbrecht¹, Johannes Schlipf², Andreas Binek¹, and Pablo Docampo¹ — ¹Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstr. 5-13, 81377 Muenchen,Germany — ²Lehrstuhl fuer Funktionelle Materialien, Physik-Department, Technische Universitaet Muenchen, James-Franck-Str. 1, 85748 Garching, Germany

Wide band-gap perovskites such as methylammonium lead bromide (MAPbBr3) are interesting materials for photovoltaic applications due to their potentially high open-circuit voltage. However, the fabrication of high quality planar films has not been investigated in detail for this material. We report a new synthesis approach for the fabrication of bromide based perovskite planar films based on the control of the deposition environment. The correlation of photocurrent and perovskite crystal properties in photovoltaic devices is studied. We achieve dense layers with large and perfectly oriented crystallites, as confirmed with grazing incidence wide angle X-ray scattering (GIWAXS). This represents the first solution-processed MAPbBr3 perovskite film with such a high degree of order. The current output was found to depend on crystal order in the perovskite film with internal quantum efficiencies approaching unity. Hence, our work not only gives a new pathway to tune morphology and crystal orientation, but demonstrates its importance for planar perovskite solar cells.