Regensburg 2016 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 90: Poster III
HL 90.18: Poster
Thursday, March 10, 2016, 16:00–19:00, Poster A
Temperature-dependent absorption measurements and photoluminescence spectroscopy of mixed organic-inorganic halide perovskite films — •Angelika Schulz1, Fabian Ruf1, Nadja Giesbrecht2, Matthias Handloser2, Pablo Docampo2, Heinz Kalt1, and Michael Hetterich1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Department of Chemistry and Center for NanoScience, University of Munich (LMU), 81377 München, Germany
Organic-inorganic halide perovskites show an outstanding performance as absorber material in solar cells due to their strong absorption coefficient, low non-radiative carrier recombination and simple low-cost production methods. With temperature-dependent absorption measurements and photoluminescence spectroscopy from 10 K to room-temperature we can gain information on structural and optical properties of the material system which is important for a better understanding of the physical processes in the absorber material. In this contribution we study CH3NH3Pb(I1-xBrx)3 and investigate the composition-dependent band-gap variation which is useful for band-gap tuning in solar cells. The material system undergoes a phase transition from the low-temperature orthorhombic phase to the tetragonal phase at 150-165 K depending on the halide composition. On the basis of the temperature-dependent absorption and photoluminescence measurements above 170 K, where the tetragonal phase seems to be stable, an upper limit for the exciton binding energy of methyl ammonium lead iodide can be estimated.