Vinylidenedithiophenmethyleneoxindole-based donor-acceptor copolymers with 1D and 2D conjugated backbones: Synthesis, characterization, and their photovoltaic properties. (September 2017)

• Record Type: Journal Article
• Authors: Zhang, Weifeng; Sun, Yuqian; Wei, Congyuan; Lin, Zuzhang; Li, Hao; Zheng, Naihang; Li, Fenghong; Yu, Gui
• Is Part Of: Dyes and pigments. Volume 144(2017)
• Page Start: 1
• Page End: 8
• Publication Date: 2017-09
• Subjects: Vinylidenedithiophenmethyleneoxindoles -- Donor-acceptor copolymers -- Benzodithiophenes -- Photovoltaic properties -- Polymer solar cells; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.04.056
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Herein, π-extended vinylidenedithiophenmethyleneoxindole (VTI) unit has been incorporated to polymeric conjugated backbones affording two donor-acceptor copolymers such as one-dimensional (1D) copolymerP1 and two-dimensional (2D) copolymerP2 . TheVTI unit owns S⋯OC intramolecular noncovalent interactions, which is favorable for acquiring planar conjugated backbone, thus leading to enhanced semiconducting properties. BothVTI -based copolymers exhibit broad absorption profiles in the visible region. The highest occupied molecular orbital/the lowest unoccupied molecular orbital energy levels ofP1 andP2 are located at −5.21/–3.50 eV, and −5.33/–3.67 eV, respectively. Bulk heterojunction solar cell-basedP2 and [6, 6]-phenyl-C71-butyric acid methyl ester (PC71 BM) blend afforded an improved power conversion efficiency (PCE) value of 4.75%. These results show that the 2DVTI -based copolymers have greater application prospect than 1D ones, and highlight the great potential ofVTI unit as a building blocks for constructing high performance polymer semiconductors for PSCs. Graphical abstract: Highlights: Two planar VTI-based donor−acceptor 1D or 2D copolymers were designed and synthesized. Polymer solar cells-based 1D or 2D copolymers were successfully fabricated. A promising power conversion efficiency of 4.75% in 2D copolymer-based PSC device.