有机-无机共添加增强柔性钙钛矿太阳能电池机械弯曲及环境稳定性能OA北大核心CSTPCD

Recently,perovskite solar cells have developed marvelously of which power conversion efficiency(PCE)achieved 26.1％,but the mechanical bending and environmental stability of flexible perovskite solar cells(F-PSCs)have remained major obstacles to their commercialization.In this study,the quality and crystallization of perovskite thin films were enhanced by adding agarose(AG).The interaction mechanism,PCE,mechanical bending and environmental stability of the assembled F-PSCs were investigated.It was found that the perovskite films modified by the optimal concentration of AG(3 mmol/L)exhibited denser and smoother morphology,higher crystallinity and absorbance,the lowest defect state density,and lower charge transfer resistance of 2191 Ω.Based on the optimal photoelectric properties,PCE increased from 15.17％to 17.30％.TiO2 nanoparticles(0.75 mmol/L)were further introduced to form a synergistic interaction with AG(3 mmol/L),which provided a rigid backbone structure,and thus enhanced the mechanical and environmental stability of perovskite layers.After 1500 cycles of bending(3 mm in radius),the AG/TiO2 co-modified F-PSCs maintained 84.73％of initial PCE,much higher than the blank device(9.32％).After 49 d in the air,the optimal F-PSCs still maintained 83.27％of initial PCE,superior than the blank device(62.21％).This work provides possibility for preparing highly efficient and stable F-PSCs.