摘要
In the past few years, organic-inorganic hybrid perovskite solar cells have received increasing attention.The trap states are one of the key factors limiting further increase of their performance.Therefore it's necessary to develop effective methods to passivate them.In this work, an n-type semiconducting copolymer of perylene diimide and dithienothiophene(PPDIDTT) is used as a dual function interfacial layer to modify the surface of perovskite films in inverted perovskite solar cells.The PPDIDTT layer can remarkably passivate the surface trap states of perovskite through the formation of a Lewis adduct between the under-coordinated Pb in perovskite and S in the dithienothiophene unit of PPDIDTT, and also shows efficient charge extraction and transfer properties.The PPDIDTT modified devices exhibit a maximum power conversion efficiency of 16.5%, superior to that of the control devices without PPDIDTT(15.3%).In addition, the device stability and hysteresis in J–V curves of the modified devices are also improved compared to those of the control devices.
In the past few years, organic-inorganic hybrid perovskite solar cells have received increasing attention.The trap states are one of the key factors limiting further increase of their performance.Therefore it's necessary to develop effective methods to passivate them.In this work, an n-type semiconducting copolymer of perylene diimide and dithienothiophene(PPDIDTT) is used as a dual function interfacial layer to modify the surface of perovskite films in inverted perovskite solar cells.The PPDIDTT layer can remarkably passivate the surface trap states of perovskite through the formation of a Lewis adduct between the under-coordinated Pb in perovskite and S in the dithienothiophene unit of PPDIDTT, and also shows efficient charge extraction and transfer properties.The PPDIDTT modified devices exhibit a maximum power conversion efficiency of 16.5%, superior to that of the control devices without PPDIDTT(15.3%).In addition, the device stability and hysteresis in J–V curves of the modified devices are also improved compared to those of the control devices.
引文
[1]F.Meng,K.Liu,S.Dai,J.Shi,H.Zhang,X.Xu,D.Li,X.Zhan,Mater.Chem.Front.,2017,DOI:10.1039/C6QM00309E.