Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
While the potential of halide perovskites for optoelectronic applications has been widely demonstrated over the past years a precise understanding of its photophysics is still missing. In this sense, the nature and role on emission of structural defects is being actively investigated, many reports pointing to halide related defects as a source of non-radiative recombination. [1,2] In this work we investigate the role of bromine-based defects on the emission properties of CH3NH3PbBr3 single crystals.
We use single crystals to avoid effects related with polycrystalline materials such as grain boundaries.
The photoluminescence (PL) of these crystals is studied as they are exposed to bromine vapors. We follow the evolution of the emission by means of PL microscopy and spectral and time-resolved measurements. This allows us to carry out a complete analysis with spatial, spectral and temporal resolution of the emission from these systems. Through this analysis, we find evidence for a strong PL enhancement and homogenization which remains upon removal of the bromine atmosphere suggesting an improvement of the sample defect structure. Further, when exposed for prolonged times we observe an eventual sample degradation. The mechanism behind this behavior is discussed in terms of Frenkel pair recombination and corrosion of the samples.
With these results we provide an insight into halide-related defects and its effect on PL and suggest post-fabrication vapor halide treatments in production procedures for perovskite applications.
[1] Ball, J.M.; Petrozza, A. : Nat. Energy 2016, 16149
[2] Buin, A.; Comin, R; Xu, J.; Ip, A. ;Sargent, E. : , Chem. Mater. 2015, 27,4405-4412
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