title: MoS2Quantum Dots with a Tunable Work Function for High-Performance Organic Solar Cells.
abstract: An efficient hole extraction layer (HEL) is critical to achieve high-performance organic solar cells (OSCs). In this study, we developed a pinhole-free and efficient HEL based on MoS2quantum dots (QDs) combined with UV-ozone (UVO) treatment. The optophysical properties and morphology of MoS2QDs and their photovoltaic performance are investigated. The results showed that MoS2QDs can form homogeneous films and can be applied as an interfacial layer not only for donors with shallow highest occupied molecular orbital (HOMO) but also for those with deep HOMO energy levels after UVO treatment (O-MoS2QDs). The solar cells based on O-MoS2QDs yield a power conversion efficiency (PCE) of 8.66%, which is 71% and 12% higher than those of the OSCs with pristine MoS2QD and O-MoS2nanosheets, respectively, and the highest PCEs for OSCs containing MoS2materials. Furthermore, the stability of solar cells based on MoS2QDs is greatly improved in comparison with state-of-the-art PEDOT:PSS. These results demonstrate the great potential of O-MoS2QDs as an efficient HEL for high-performance OSCs.
authors.affiliation: College of Materials Science and Optoelectronic Technology & CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences , Yanqi Lake, Huairou District, Beijing 101408, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Xing
authors.affiliation: College of Materials Science and Optoelectronic Technology & CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences , Yanqi Lake, Huairou District, Beijing 101408, China.
authors.forename: Yusheng
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Materials Science and Optoelectronic Technology & CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences , Yanqi Lake, Huairou District, Beijing 101408, China.
authors.forename: Xinlong
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Materials Science and Optoelectronic Technology & CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences , Yanqi Lake, Huairou District, Beijing 101408, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Lv
authors.affiliation: Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS) , Ningbo 315201, China.
authors.forename: Xinhua
authors.initials: X
authors.lastname: Ouyang
authors.affiliation: Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS) , Ningbo 315201, China.
authors.forename: Ziyi
authors.initials: Z
authors.lastname: Ge
authors.affiliation: College of Materials Science and Optoelectronic Technology & CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences , Yanqi Lake, Huairou District, Beijing 101408, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Huang
keywords: MoS2 quantum dots; UV−ozone treatment; hole extraction layer; organic solar cells; pinhole free; tunable work function