Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Perovskite and Hybrid Photovolatics
HL 18.9: Talk
Tuesday, March 13, 2018, 11:45–12:00, EW 203
From the Very Beginning: Linking Photovoltaic Evolution and Crystal Formation by the Example of Perovskite Solar Cells — •Vita Mergner1,2, Lukas Wagner1, Simone Mastroianni1, Uli Würfel1, Carmen Sanchez-Valle2, and Andreas Hinsch1 — 1Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstraße 2, D-79110, Freiburg, Germany — 2Institute for Mineralogy, Universität Münster, Corrensstraße 24, D-48149, Münster, Germany
We present an experimental approach, which, for the first time, allows an observation of the photovoltaic effect in semiconductor devices during crystallization. The examination is facilitated by a nano-porous contact scaffold for the extraction of the charge carriers within which a precursor solution is infiltrated as the final processing step to form a methylammonium lead iodide absorber layer in the perovskite solar cell. With this approach, we were able to simultaneously relate radiative recombination and transport of the photo-excited charges to the perovskite formation process. [1] Thereby, the former perovskite crystallization model could be refined by providing the crystallization stages associated with the photovoltaic performance in real-time as well as microscopically resolved real-time imaging of the photoluminescence. The results provide deeper understanding in the evolvement of crystal growth of the perovskites and electrical coupling to the contact material which are key parameters for an optimization of perovskite solar cells. [1] Wagner, Mundt et al. Scientific Reports (2017). DOI: 10.1038/s41598-017-13855-6