Europium-Doped CsPbI2Br for Stable and Highly Efficient Inorganic Perovskite Solar Cells

By W. Xiang, Zaiwei Wang, D. Kubicki, W. Tress, Jingshan Luo, Daniel Prochowicz, S. Akin, L. Emsley, Jiangtao Zhou, G. Dietler and 2 more. Joule, 2019

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Summary All-inorganic perovskite films hold promise for improving the stability of perovskite solar cells (PSCs). However, the 3D α phase of narrow-bandgap inorganic perovskites is thermodynamically unstable at room temperature, limiting the development of high-performance inorganic PSCs. Here, we show that europium doping of CsPbI2Br stabilizes the α phase of this inorganic perovskite at room temperature. We rationalize it by using solid-state nuclear magnetic resonance and high-angle annular dark-field scanning transmission electron microscopy, which show that europium is incorporated into the perovskite lattice. We demonstrate a maximum power-conversion efficiency of 13.71% for an inorganic PSC with the CsPb0.95Eu0.05I2Br perovskite and a stable power output of 13.34%. Using electroluminescence we show that incorporation of europium reduces non-radiative recombination, resulting in high open-circuit voltage of 1.27 V. The devices retain 93% of the initial efficiency after 370 hr under 100 mW cm−2 continuous white light illumination under maximum-power point-tracking measurement.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/8ceeea59f1d5e1cc30f178edcf85002413dafd82