AUTHOR=Qiao Hong Wei , Chen Mengjiong , Zhou Ziren , Cheng Qilin , Hou Yu , Yang Hua Gui 

TITLE=Improved Photovoltaic Performance of CsPbI2Br Perovskite Films via Bivalent Metal Chloride Doping

JOURNAL=Frontiers in Energy Research

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.692059

DOI=10.3389/fenrg.2021.692059

ISSN=2296-598X

ABSTRACT=<p>Cesium-based all-inorganic perovskite absorbers have attracted increasing attention due to their superior thermal stability, compared to their organic–inorganic counterparts. Up to now, it is a challenge to fabricate high-efficiency all-inorganic perovskite solar cells (PSCs) with low defect densities. Herein, we used bivalent metal chloride salts (SrCl<sub>2</sub> and NiCl<sub>2</sub>) to optimize CsPbI<sub>2</sub>Br films. The experimental results indicate that this method could deliver high-quality films with improved electronic property. As a result, the champion device based on the 0.01 M SrCl<sub>2</sub>–doped CsPbI<sub>2</sub>Br film achieved a power conversion efficiency (PCE) of 16.07% with a high open voltage (<italic>V</italic><sub>OC</sub>) of 1,322 mV, which is about 18% higher than that of the pristine device.</p>