通过在CsPbBr3薄膜上旋涂一次I2的异丙醇溶液以修饰CsPbBr3吸光层，钝化CsPbBr3层表面缺陷，改善CsPbBr3薄膜形貌。同时通过利用环境友好的绿色溶剂水溶解CsBr，显著提高了其溶解度，减少了旋涂次数，简化了电池制备流程。实验结果表明，在CsPbBr3钙钛矿太阳能电池(perovskite solar cells，PSCs)中，使用5 mg·mL-1 I2的异丙醇溶液界面修饰的器件具有最佳光伏性能，其最高开路电压(open-circuit voltage，VOC)为 1。55 V，短路电流密度(short circuit current density，JSC)为7。45 mA·cm-2，填充因子(fill factor，FF)为 85。54％，光电转换效率(photoelectric conversion efficiency，PCE)达到了 9。88％。
Effect of I2 interface modification engineering on the performance of all-inorganic CsPbBr3 perovskite solar cells
The CsPbBr3 absorber layer made from CsBr aqueous solution was modified by spin-coating I2 isopropa-nol solution,which the surface defects of the CsPbBr3 layer were passivated,and the CsPbBr3 film with better mor-phology was obtained.The solar cells were optimized by exploring different spin-coating concentrations of CsBr methanol solution,and when 5 mg·mL-1 I2 isopropanol solution was used for interface modification,the perovskite film was significantly improved in morphology from the result of X-ray diffraction,scanning electron microscope and had the best optoelectronic performance.As a consequence,CsPbBr3-based perovskite solar cells(PSCs)with 5 mg·mL-1 I2 isopropanol solution can reach the best open-circuit voltage(VOC),short circuit current density(JSC),fill factor(FF)of 1.55 V,7.45 mA·cm-2,85.54％,respectively,and the ultimate photoelectric conversion efficiency(PCE)attained 9.88％.
all-inorganic perovskite solar cellCsPbBr3I2 interface modification
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