A Green Antisolvent Strategy for Enhancing the Performance of Carbon-based CsPbIBr2 Solar Cells
AbstractAll-inorganic CsPbIBr2 perovskite materials demonstrated to own a balanceable feature for its acceptable bandgap, good phase stability and excellent thermal stability. Herein, we introduce ethyl acetate (EA) and chlorobenzene (CB) as antisolvent to improve the quality of CsPbIBr2 thin films. Compared with CB, EA is a good green antisolvent, and high-quality CsPbIBr2 thin films with enlarged grain sizes, few grain boundaries as well as improved optical properties were obtained by optimizing EA as antisolvent. Based on a carbon-based and hole-free planar heterojunction structure of FTO/TiO2/CsPbIBr2/Carbon, an optimal power conversion efficiency (PCE) of 4.35% was achieved, 10% enhancement in PCE. This work contributes to selecting nontoxic solvent engineering for realizing the preparation of high-quality CsPbIBr2 thin films and the improved performance of all-inorganic CsPbIBr2 PSCs.
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