Hu Zhao, Fu Weifei, Yan Lijia, Miao Jingsheng, Yu Hongtao, He Yaowu, Goto Osamu, Meng Hong, Chen Hongzheng, Huang Wei
School of Advanced Materials , Peking University Shenzhen Graduate School , Shenzhen 518055 , China . Email:
State Key Laboratory of Silicon Materials , MOE Key Laboratory of Macromolecular Synthesis and Functionalization , Department of Polymer Science & Engineering , Zhejiang University , Hangzhou 310027 , China.
Chem Sci. 2016 Aug 1;7(8):5007-5012. doi: 10.1039/c6sc00973e. Epub 2016 May 3.
Three new spirofluorene-based hole transport materials, Spiro-S, Spiro-N, and Spiro-E, are synthesized by replacing the -methoxy substituent in 2,2',7,7'-tetrakis(,-di--methoxyphenylamine)-9,9'-spirobifluorene (Spiro-MeOTAD) with methylsulfanyl, ,-dimethylamino and ethyl groups. Their properties as hole transport materials in perovskite solar cells are investigated. The impact of replacing the -methoxy substituent on bulk properties, such as the photophysical properties, HOMO/LUMO energy level, hole extraction properties and morphologies of perovskite thin films are investigated. Their optoelectronic and charge-transport properties and performance in perovskite solar cells are compared with the current benchmarked and structurally-related hole transport material (HTM) Spiro-MeOTAD. Surprisingly, the methylsulfanyl substituted spirofluorene shows the highest power conversion efficiency of 15.92% among the investigated spirofluorenes, which is an over 38% increase in PCE compared with that of Spiro-MeOTAD under similar device fabrication conditions.
通过用甲硫基、N,N-二甲基氨基和乙基取代2,2',7,7'-四(4-二对甲氧基苯胺基)-9,9'-螺二芴（Spiro-MeOTAD）中的对甲氧基取代基，合成了三种新型的基于螺芴的空穴传输材料Spiro-S、Spiro-N和Spiro-E。研究了它们在钙钛矿太阳能电池中作为空穴传输材料的性能。研究了取代对甲氧基取代基对本体性质的影响，如光物理性质、HOMO/LUMO能级、空穴提取性质以及钙钛矿薄膜的形貌。将它们在钙钛矿太阳能电池中的光电和电荷传输性质及性能与目前作为基准的结构相关的空穴传输材料（HTM）Spiro-MeOTAD进行了比较。令人惊讶的是，在所研究的螺芴中，甲硫基取代的螺芴显示出最高的功率转换效率，为15.92%，与在类似器件制备条件下的Spiro-MeOTAD相比，其功率转换效率提高了38%以上。
