通过对螺二芴的掺杂有效抑制非辐射复合制备高性能钙钛矿太阳能电池

Suppression of Non-radiative Recombination with Efficient Doping of Spiro-OMeTAD for High-Performance Perovskite Solar Cells

金属卤素钙钛矿太阳能电池由于非辐射复合的损失,导致光电转换效率仍远低于肖克利-奎瑟尔极限.本工作对安赛蜜分子作为空穴传输材料螺芴的掺杂剂进行了研究.研究发现相对于双三氟甲基磺酰亚胺锂12%摩尔比的安赛蜜掺杂时,非辐射复合从86.05%降到了69.23%,电池的开路电压平均增长了0.08伏,最好的电池光电转换效率增长到了21.9%.并且,在相对湿度20%~30%的干燥空气环境下老化720小时后电池的光电转换效率仍大于最初值的84%.

Metal-halide perovskite solar cells(PSCs)have attracted considerable attention during the past decade.However,due to the existence of non-radiative recombination losses,the best power conversion efficiency(PCE)is still lower than the theoretical limit defined by Shockley-Queser theory.In this work,we investigate 1,2,3-oxathiazin-4(3h)-one,6-methyl-2,2-dioxide(acesulfame potassium,abbreviated as AK)as a additional dopant for the 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene(Spiro-OMeTAD)and fabricate PSCs in the air.It is found that 12 mol%fraction of AK relative to lithium bis((trifluoromethyl)sulfonyl)-amide(Li-TFSI)reduces the non-radiative recombination from 86.05%to 69.23%,resulting in an average 0.08 V of Voc enhancement.The champion solar cell gives a perovskite solar cells up to 21.9%and over 84%retention of the initial value during 720 h aging in dry air with 20%−30%humidity.