Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Functional semiconductors for renewable energy solutions I (joint session HL/CPP)

HL 24.1: 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.