Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 44: Functional semiconductors for renewable energy solutions I (joint session HL/CPP)
CPP 44.1: Invited Talk
Tuesday, March 17, 2020, 09:30–10:00, POT 151
Ionic Defects in Hybrid Perovskite Solar Cells — •Carsten Deibel1, Sebastian Reichert1, Qingzhi An2, and Yana Vaynzof2 — 1Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany — 2Technische Universität Dresden, Institut für Angewandte Physik and Centre for Advancing Electronics Dresden (cfaed), Nöthnitzer Straße 61, 01069 Dresden
Hybrid perovskite semiconductors are an interesting material system to build low-cost solar cells with high efficiency. However, processing them can be challenging: minimal and unintentional sample-to-sample variations during the fabrication process affect the ionic defects and thus the device performance. Here, I will present a joint study on the defect properties in perovskite solar cells consisting of methylammonium lead iodide (MAPbI3) in dependence of the precursor solution stoichiometry. We applied impedance spectroscopy and deep-level transient spectroscopy. Our results show different ion species, and each of them features a distribution of the diffusion coefficients. The ion migration activation energies vary systematically with stoichiometry, which might explain the wide range of activation energies in the literature. I will show that the ionic defect properties we observed can be categorised using the Meyer–Neldel rule.