Highly Stretchable All-Polymer Solar Cells Enabled by Siloxane-Terminated Side Chains and Molecular Weight Control
Stretchable organic solar cells are promising wearable power generators. Here, we synthesize a series of bithienyl-benzodithiophene- alt -fluorobenzotriazole copolymer (PBZ-2Si) with siloxane-terminated side chains, and compare with J52 analogues to investigate side chain effects on the photovoltaic and mechanical properties. When different molecular weight ( M n ) of PBZ-2Si, denoted as PBZ-2Si L , PBZ-2Si M and PBZ-2Si H , blended with the N2200 acceptor, the PBZ-2Si M based all-polymer solar cell (all-PSC) shows an improved PCE of 7.01% as compared to that of J52 (5.30%). The improved PCE of PBZ-2Si M is attributed to the enhanced molecule aggregation, balanced charge transport and optimal film morphology induced by siloxane side chains. Notably, the PBZ-2Si M :N2200 blend film shows a significantly improved stretchability of 38.4% compared to 19.5% of J52 reference, because the plasticizing effect that extended soft siloxane side chains enlarge interchain distance of polymer backbones and increase the chain rotational free volume. Further increasing M n enhances polymer chain entanglements and boosts the stretchability up to 50.7%, known as the highest stretchability reported to date. Moreover, the PBZ-2Si M -based stretchable OSC showed a high PCE of 6.0% and maintained over 80% of its initial PCE at 50% enormous strain, outperforming the J52 reference. Therefore, our work provides practical guidelines for developing highly efficient and stretchable all-PSC
Year of publication: |
[2022]
|
---|---|
Authors: | Shao, Ming ; Xu, Meichen ; Zhang, Di ; Wang, Zhenye ; Liu, Zhitian ; Gao, Xiang ; He, Jiayi ; Gao, Yerun ; Li, Zhilin |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
Saved in favorites
Similar items by person
-
Renewable energy investment in China : the impact of low oil prices
Alazraque-Cherni, Judith, (2016)
-
Process Reengineering of Cold Chain Logistics of Agricultural Products Based on Low-carbon Economy
Guo, Hong-xia, (2012)
-
Simulation of Longitudinal Exposure Data with VarianceāCovariance Structures Based on Mixed Models
Song, Peng, (2013)
- More ...