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.
Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS) , Ningbo 315201, China.
ACS Appl Mater Interfaces. 2016 Oct 12;8(40):26916-26923. doi: 10.1021/acsami.6b06081. Epub 2016 Sep 28.
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 MoS quantum dots (QDs) combined with UV-ozone (UVO) treatment. The optophysical properties and morphology of MoS QDs and their photovoltaic performance are investigated. The results showed that MoS QDs 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-MoS QDs). The solar cells based on O-MoS QDs yield a power conversion efficiency (PCE) of 8.66%, which is 71% and 12% higher than those of the OSCs with pristine MoS QD and O-MoS nanosheets, respectively, and the highest PCEs for OSCs containing MoS materials. Furthermore, the stability of solar cells based on MoS QDs is greatly improved in comparison with state-of-the-art PEDOT:PSS. These results demonstrate the great potential of O-MoS QDs as an efficient HEL for high-performance OSCs.
高效的空穴提取层（HEL）对于实现高性能有机太阳能电池（OSCs）至关重要。在本研究中，我们开发了一种无针孔且高效的 HEL，基于 MoS 量子点（QD）与 UV-臭氧（UVO）处理相结合。研究了 MoS QD 的光电性质和形态及其光伏性能。结果表明，MoS QD 可以形成均匀的薄膜，并可作为界面层，不仅适用于最高占据分子轨道（HOMO）较浅的给体，也适用于 HOMO 能级较深的给体，经过 UVO 处理后（O-MoS QD）。基于 O-MoS QD 的太阳能电池的功率转换效率（PCE）为 8.66%，分别比具有原始 MoS QD 和 O-MoS 纳米片的 OSCs 的 PCE 高 71%和 12%，并且是包含 MoS 材料的 OSCs 中最高的 PCE。此外，与最先进的 PEDOT:PSS 相比，基于 MoS QD 的太阳能电池的稳定性大大提高。这些结果表明，O-MoS QD 作为高效 HEL 对于高性能 OSCs 具有巨大的潜力。
