Bis(4-methylthio)phenyl)amine-based hole transport materials for highly-efficient perovskite solar cells: insight into the carrier ultrafast dynamics and interfacial transport  

作　　者：Xuguang Jia Yi Zhang Jing Zhang Quan Sun Huafei Guo Yikai Wang Shuai Zhang Ningyi Yuan Jianning Ding 

机构地区：[1]School of Materials Science and Engineering,Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering,Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology,Changzhou University,Changzhou 213164,China [2]College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,China [3]Micr/Nano Science and Technology Center,Jiangsu University,Zhenjiang,212013,China

出　　处：《Science China Chemistry》2020年第6期827-832,共6页中国科学（化学英文版）

基　　金：supported by the National Key Research and Development Program of China(2017YFB037001);the National Natural Science Foundation of China(91648109、51603021、51602031、51673139);Jiangsu Provincial“333”High-level Talent Training Project;the Priority Academic Program Development of Jiangsu Higher Education Institutions;the Applied Basic Research Program of Changzhou(CJ20190050)。

摘　　要：Hole transport layers(HTLs)play a significant role in the performance of perovskite solar cells.A new class of linear smallmolecules based on bis(4-methylthio)phenyl)amine as an end group,carbon,oxygen and sulfur as the center atoms for the center unit(denoted as MT-based small-molecule),respectively,have been applied as HTL,and two of them presented the efficiency over 20%in the planar inverted perovskite solar cells(PSCs),which demonstrated a significant improvement in comparison with the widely used HTL,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(known as PEDOT:PSS),in the planar inverted architecture.The ultrafast carrier dynamics show that the excited hot carrier cooling process of MT-based small-molecule HTL samples is faster than that of PEDOT:PSS samples.The kinetic analysis of photo-bleaching peaks of femtosecond transient absorption spectra reveals that the traps at the interface between MT-based small-molecule HTLs and MAPbI3 can be filled much quicker than that at PEDOT/MAPbI3 interfaces.Moreover,the hole injection time from MAPbI3 to MT-based small-molecule HTLs is around 10 times quicker than that to PEDOT:PSS.Such quick trap filling and hole extraction bring a significant enhancement in photovoltaic performances.These findings uncover the carrier transport mechanisms and illuminate a promising approach for the design of new HTLs for highly-efficient perovskite solar cells.

关 键 词：perovskite solar cell hole transport layer ultrafast carrier dynamics 

分 类 号：TM914.4[电气工程—电力电子与电力传动]