Frontiers in Energy Research (May 2021)

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

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

DOI
https://doi.org/10.3389/fenrg.2021.692059
Journal volume & issue
Vol. 9

Abstract

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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 (SrCl2 and NiCl2) to optimize CsPbI2Br 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 SrCl2–doped CsPbI2Br film achieved a power conversion efficiency (PCE) of 16.07% with a high open voltage (VOC) of 1,322 mV, which is about 18% higher than that of the pristine device.

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