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Inactive (PbI2)2RbCl stabilizes perovskite films for efficient solar cells
非活性(PbI2)2RbCl稳定钙钛矿薄膜高效太阳能电池
▲ 作者:YANG ZHAO, FEI MAZIHAN QU, SHIQI YU, TAO SHEN, HUI-XIONG DENG et al.

▲ 链接:
https://www.science.org/doi/10.1126/science.abp8873


▲ 摘要:
在卤化物钙钛矿太阳能电池中,二次相过量碘化铅(PbI2)的形成对功率转换效率(PCE)有一定的积极影响,但会损害器件的稳定性,并在电压扫描时造成较大的滞后效应。


通过RbCl掺杂,我们将PbI2转化为非活性(PbI2)2RbCl化合物,有效地稳定了钙钛矿相。基于此方法,我们获得了FAPbI3钙钛矿太阳能电池,其认证功率转换效率PCE为25.6%。在储存1000小时后,器件保留了96%原始功率转换效率PCE值,在85°C下进行500小时热稳定性测试后,保留了80%原始功率转换效率PCE值。


▲ Abstract:
In halide perovskite solar cells the formation of secondary-phase excess lead iodide (PbI2) has some positive effects on power conversion efficiency (PCE) but can be detrimental to device stability and lead to large hysteresis effects in voltage sweeps. We converted PbI2 into an inactive (PbI2)2RbCl compound by RbCl doping, which effectively stabilizes the perovskite phase. We obtained a certified PCE of 25.6% for FAPbI3 (FA, formamidinium) perovskite solar cells on the basis of this strategy. Devices retained 96% of their original PCE values after 1000 hours of shelf storage and 80% after 500 hours of thermal stability testing at 85°C.
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