5 years ago

PEDOT:PSS-Assisted Exfoliation and Functionalization of 2D Nanosheets for High-Performance Organic Solar Cells

PEDOT:PSS-Assisted Exfoliation and Functionalization of 2D Nanosheets for High-Performance Organic Solar Cells
Liqiu Yang, Xiaozhou Xu, Xiaoxi Wu, Qingyu Guo, Pan Ye, Ting Zhu, Weiwei Li, Hui Huang, Wang Xing, Yusheng Chen
Here, a facial and scalable method for efficient exfoliation of bulk transition metal dichalcogenides (TMD) and graphite in aqueous solution with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) to prepare single- and few-layer nanosheets is demonstrated. Importantly, these TMD nanosheets retain the single crystalline characteristic, which is essential for application in organic solar cells (OSCs). The hybrid PEDOT:PSS/WS2 ink prepared by a simple centrifugation is directly integrated as a hole extraction layer for high-performance OSCs. Compared with PEDOT:PSS, the PEDOT:PSS/WS2-based devices provide a remarkable power conversion efficiency due to the “island” morphology and benzoid–quinoid transition. This study not only demonstrates a novel method for preparing single- and few-layer TMD and graphene nanosheets but also paves a way for their applications without further complicated processing. A novel PEDOT:PSS/2D nanosheets ink as hole extraction layer is used to fabricate high-performance organic solar cells. 2D nanosheets with single- and few-layer structure exist stably in the ink because of PEDOT:PSS exfoliation and functionalization. The enhanced power conversion efficiency arises from the “island” morphology and benzoid–quinoid transition upon addition of 2D nanosheets.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201701622

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