C70苄基衍生物的合成及其在钙钛矿太阳能电池中的应用

Synthesis of C70 benzyl derivative and its application in perovskite solar cells

富勒烯及其衍生物具有高电子传输效率,是倒置平面异质结钙钛矿太阳能电池器件中优异的电子传输材料(ETMs).其中,富勒烯C 70通常存在众多的异构体产物,通过常规手段难以实现有效分离,因此关于结构明确的富勒烯衍生物对钙钛矿太阳能电池的影响,目前尚缺乏系统的研究和理解.该文成功合成并分离了一种结构明确的C 70衍生物2,5-(PhCH 2)2 C 70,并将其作为ETMs构建倒置平面异质结钙钛矿太阳能电池器件,最终实现了12.77%的光电转换效率,通过对富勒烯衍生物中分子晶体结构堆积的研究,分析了富勒烯衍生物结构对钙钛矿太阳能电池器件性能的影响.

Fullerene and its derivatives are the most efficient electron transport materials(ETMs)in the inverted planar heterojunction perovskite solar cells(PSCs)due to their superior electron transport ability.However,due to enormous obstacles in the separation of C 70 derivative isomers,the influence of fullerene derivatives with different structures on the PSCs has not been systematically explored heretofore.Herein,based on the successful preparation of a C 70 derivative 2,5-(PhCH 2)2 C 70,and subsequent incorporation into the inverted planar heterojunction PSCs as the ETMs,a champion photoelectric conversion efficiency of 12.77%was obtained.Furthermore,the influence of the fullerene derivative structure was figured out through crystallographic understanding of molecular packing.