Improving the performance of arylamine-based hole transporting materials in perovskite solar cells： Extending π-conjugation length or increasing the number of side groups？  

作　　者：Xuepeng Liu Fantai Kong Wangchao Chen Ting Yu Yin Huang Tasawar Hayat Ahmed Alsaedi Hongxia Wang Jian Chen Songyuan Dai 

机构地区：[1]Key Laboratory of Photovolatic and Energy Conservation Materials, CAS, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230088, Anhui, China [2]University of Science and Technology of China, Hefei 230026, Anhui, China [3]NAAM Research Group. Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia [4]School of Chemistry, Physics and Mechanical Engineering. Queensland University of Technology, Brisbane OLD 4001, Australia [5]Beijing Key Laboratory of Novel Thin-Film Solar Cells. North China Electric Power University. Beijing 102206, China

出　　处：《Journal of Energy Chemistry》2018年第5期1409-1414,共6页能源化学（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2015CB932200);the CAS-Iranian Vice Presidency for Science and Technology Joint Research Project (No. 116134KYSB20160130);the Natural Science Foundation of Anhui Province (No. 1508085SMF224);the National Natural Science Foundation of China (No. 51474201);the External Cooperation Program of BIC, Chinese Academy of Sciences (No. GJHZ1607)

摘　　要：In this work, we prepared three simple arylamine-based hole transporting materials from commercially available starting materials. The effect of extending z-conjugation length or increasing the number of side groups compared with reference compound on the photophysical, electrochemical, hole mobility properties and performance in perovskite solar cells were further studied. It is noted that these two kinds of molecular modifications can significantly lower the HOMO level and improve the hole mobility, thus improving the hole injection from valence band of perovskite. On the other hand, the compound with more side groups showed higher hole injection efficiency due to lower HOMO level and higher hole mo- bility compared with the compound with extending π-conjugation length. The perovskite solar cells with the modified molecules as hole transporting materials showed a higher efficiency of 15.40% and 16.95%, respectively, which is better than that of the reference compound （13.18%）. Moreover, the compound with increasing number of side groups based devices showed comparable photovoltaic performance with that of conventional spiro-OMeTAD （16.87%）.In this work, we prepared three simple arylamine-based hole transporting materials from commercially available starting materials. The effect of extending z-conjugation length or increasing the number of side groups compared with reference compound on the photophysical, electrochemical, hole mobility properties and performance in perovskite solar cells were further studied. It is noted that these two kinds of molecular modifications can significantly lower the HOMO level and improve the hole mobility, thus improving the hole injection from valence band of perovskite. On the other hand, the compound with more side groups showed higher hole injection efficiency due to lower HOMO level and higher hole mo- bility compared with the compound with extending π-conjugation length. The perovskite solar cells with the modified molecules as hole transporting materials showed a higher efficiency of 15.40% and 16.95%, respectively, which is better than that of the reference compound （13.18%）. Moreover, the compound with increasing number of side groups based devices showed comparable photovoltaic performance with that of conventional spiro-OMeTAD （16.87%）.

关 键 词：Hole transporting materials PEROVSKITE π-conjugation length Side groups 

分 类 号：TM914.4[电气工程—电力电子与电力传动]