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- Title
High-Performance Thick-Film All-Polymer Solar Cells Created Via Ternary Blending of a Novel Wide-Bandgap Electron-Donating Copolymer.
- Authors
Fan, Baobing; Zhu, Peng; Xin, Jingming; Li, Ning; Ying, Lei; Zhong, Wenkai; Li, Zhenye; Ma, Wei; Huang, Fei; Cao, Yong
- Abstract
A novel wide-bandgap electron-donating copolymer containing an electrondeficient, difluorobenzotriazole building block with a siloxane-terminated side chain is developed. The resulting polymer, poly{(4,8-bis(4,5-dihexylthiophen- 2-yl)benzo[1,2-b:4,5-b']dithiophene-co-4,7-di(thiophen-2-yl)-5,6-difluoro-2-(6- (1,1,1,3,5,5,5-heptamethyltri-siloxan-3-yl)hexyl)-2H-benzo[d][1,2,3]triazole} (PBTA-Si), is used to successfully fabricate high-performance, ternary, all-polymer solar cells (all-PSCs) insensitive to the active layer thickness. An impressively high fill factor of ≈76% is achieved with various ternary-blending ratios. The optimized all-PSCs attain a power conversion efficiency (PCE) of 9.17% with an active layer thickness of 350 nm and maintain a PCE over 8% for thicknesses over 400 nm, which is the highest reported efficiency for thick all-PSCs. These results can be attributed to efficient charge transfer, additional energy transfer, high and balanced charge transport, and weak recombination behavior in the photoactive layer. Moreover, the photoactive layers of the ternary all-PSCs are processed in a nonhalogenated solvent, 2-methyltetrahydrofuran, which greatly improves their compatibility with large-scale manufacturing.
- Subjects
POLYMERS; SOLAR cells; THICK films; BAND gaps; SILOXANES
- Publication
Advanced Energy Materials, 2018, Vol 8, Issue 14, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201703085