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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 57: Hybrid Perovskite and Photovoltaics I (joint session CPP/HL)
CPP 57.12: Vortrag
Mittwoch, 18. März 2020, 12:30–12:45, ZEU 260
The impact of mobile ions on the open cicuit voltage decay of perovskite solar cells explained by time resolved drift-diffusion simulations. — •Mathias Fischer, David Kiermasch, Kristofer Tvingstedt, and Vladimir Dyakonov — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg
The open circuit voltage decay (OCVD) is a characteristic transient response of an operating solar cell after the illumination is turned off. By analyzing such transients correctly, it is possible to obtain valuable information about charge carrier dynamics in a fully functional device. When additional charged species like mobile ions are present, extraordinary features can be observed during the OCVD. We use a self-programmed transient drift-diffusion simulator involving mobile ions with sub-nanoseconds time resolution, to show how quantitative information about the ionic species, such as concentration and diffusion coefficient can be obtained. The simulated transients showing characteristic ionic features are in excellent agreement with experimental data from methylammonium lead iodide (CH3NH3PbI3) devices. Further, the ionic contributions to the OCVD are clearly visualized by specially resolved carrier profiles. This approach opens up new ways to interpret transient electrical measurements on perovskite based devices.