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Tuning the A-site cation and X-site anion composition of CH_3NH_3PbI_3 perovskite material for efficient planar perovskite solar cells

Yangyang Cai  Lai Xie  Sujuan Wu  
【摘要】:In order to optimize microstructure and improve the photoelectric properties of planar perovskite solar cells(PSCs), the Cs~+ and SCN~- are selected to tune the A-site cation and X-site anion composition of CH_3NH_3PbI_3 material with ABX_3 structure, respectively. The effects of Cs~+ and SCN~- addition on the microstructure and photoelectric properties of(CH_3NH_3)_(0.9)Cs_(0.1)Pb(I_(1-x)SCN_x)_3 perovskite films and the performance of PSCs have been systematically investigated. The value of "x" corresponding to the amount of SCN-has been optimized. At the optimum amount of 0.05, the(CH_3NH_3)_(0.9)Cs_(0.1)Pb(I_(0.95)SCN_(0.05))_3(Cs_(0.1)SCN_(0.05)) PSC achieve the champion power conversion efficiency(PCE) of 18.78% and average PCE of 17.66%, being much higher than that of the reference PSCs. The results indicate that the obtained Cs_(0.1)SCN_(0.05) perovskite film shows the improved microstructure, better local electric properties, the reduced trap density and suppressed charge recombination, resulting in the promoted carrier transfer and improved performance in PSCs.

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