Composition engineering of operationally stable CsPbI2Br perovskite solar cells with a record efficiency over 17

By Teoman Öztürk, Erdi Akman, A. Shalan, S. Akin. 2021

148 citations recorded by the source corpus.

Abstract Despite the rapid progress in inorganic cesium lead halide perovskite (CsPbX3) materials originating from excellent thermal stability; their poor phase stability at room temperature and lower efficiency compared to organic-inorganic counterparts still limit their development toward commercialization. Recently, Pb-site doping of inorganic perovskites stand outs for the improvement of aforementioned issues for emerging photovoltaic applications. Herein, we introduce a compositional engineering approach to tune the CsPbI2Br crystallization by directly incorporating iron (II) chloride (FeCl2) into perovskite precursor. The small amount of FeCl2 stabilizes the black α-phase to avoid the undesirable formation of the non-perovskite phase owing to Fe2+ induced grain size reduction. Besides, the FeCl2 incorporation thoroughly align the energy level, promote the built-in potential (Vbi), and reduce the defect states in the perovskite, resulting in a record power conversion efficiency (PCE) of 17.1% with a remarkable open-circuit voltage (VOC) of 1.31 V. More importantly, FeCl2-doped CsPbI2Br-based devices exhibit an exceptional operational stability with a retention of over 95% initial PCE after 330 h at maximum power point (MPP) tracking.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/8d41c1b3f8ede2a4b5b29d849332a2fcf7ce4696