Time-Evolving Electroluminescence Imaging in Perovskite Solar Cells

Jackson W. Schall1,2, Hsinhan Tsai3, Harvey Guthrey1, Chun-Sheng Jiang1, Steve Johnston1, Dana Kern1, Andrew Norman1, Mowafak Al-Jassim1 1National Renewable Energy Laboratory, Golden, CO, United States /2Colorado School of Mines, Golden, CO, United States /3First Solar, Perrysburg, OH, United States

We present an approach to evaluate perovskite solar cell reliability and metastability during 100-hour stress/rest cycling under electrical bias with in-situ electroluminescence (EL) imaging. We show an example of time-evolving EL and associated voltage transients under constant current bias for triple-cation mixed-halide devices with defects of lead-iodide-rich wrinkles. We observe the greatest degradation in the regions of the wrinkles. Our results demonstrate how time-evolving luminescence imaging can be applied to better understand impacts of spatial imperfections on perovskite photovoltaic device stability.