Zinc and Acetate Co-doping for Stable Carbon-Based CsPbIBr₂ Solar Cells with Efficiency over 10.6%

The all-inorganic CsPbIBr2 perovskite solar cells (PSCs) have been developed quickly in the past few years due to their photoelectric features and excellent stability. However, the disadvantages of high defect density and short carrier lifetime of CsPbIBr2 perovskites result in the inability to improve the power conversion efficiency (PCE) of batteries and hinder their practical application. Here, we prove that doping an appropriate amount of Zn(Ac)2 (0.2%, at.) in CsPbIBr2 PSCs can improve crystal quality, decrease trap density, and optimize charge recombination. Therefore, the PCE of the 0.2 mol % Zn(Ac)2-doped CsPbIBr2 PSC has been improved from 8.23 to 10.65%, and the improvement rate has reached 29%. In addition, the unencapsulated Zn2+ and Ac– co-doped device has better long-term stability in an ambient atmosphere. The method can effectively increase the PCE and stability of carbon-based CsPbIBr2 PSCs, which also provides a reference direction for future commercial applications.