Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.034
Publication date: 21st November 2018
Organic-inorganic perovskites have attracted tremendous interest due to their exceptional optical and electrical properties (high carrier mobility, long carrier diffusion length, and large absorption coefficient). These lead to high power conversion efficiencies of organic-inorganic perovskites ranging slightly above 22% by using simple spin-coating processing.
This paper addresses the influence of the out-diffusion of the solvent, here dimethyl sulfoxide (DMSO) as often used for such processing techniques, on the device quality. The temperature dependence of the out-diffusion of DMSO from CH3NH3PbI3 precursor layers was investigated by applying the flash-anneal technique and analyzing the S=O vibrational mode in the layers using infrared spectroscopic ellipsometry. The diffusion of DMSO can be well described by diffusion in a homogeneous layer. The diffusion coefficient of DMSO in CH3NH3PbI3 amounts to about 10-11 cm²/s at 100 °C. Furthermore, the diffusion constant exhibits an activated behavior with activation energies of E = 0.6 and 1.8 eV, respectively, indicating the presence of two different migration processes. The obtained activation energies will be discussed in terms of decomposition and incorporation of DMSO related complexes in the perovskite lattice. Finally the influence of the out-diffusion of DMSO on the formation of the CH3NH3PbI3 lattice will be debated.
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