All‐Polymer Solar Cells Based on a Conjugated Polymer Containing Siloxane‐Functionalized Side Chains with Efficiency over 10

A novel wide‐bandgap conjugated copolymer based on an imide‐functionalized benzotriazole building block containing a siloxane‐terminated side‐chain is developed. This copolymer is successfully used to fabricate highly efficient all‐polymer solar cells (all‐PSCs) processed at room temperature with th...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2017-12, Vol.29 (47), p.n/a
Main Authors: Fan, Baobing, Ying, Lei, Zhu, Peng, Pan, Feilong, Liu, Feng, Chen, Junwu, Huang, Fei, Cao, Yong
Format: Article
Language:English
Subjects:
all‐polymer solar cells
Benzotriazole
Block copolymers
Carrier mobility
Current carriers
Diimide
Efficiency
Energy conversion efficiency
face‐on orientation
green solvent
Naphthalene
Photovoltaic cells
Polymers
siloxane‐functionalized side chains
Solar cells
Tetrahydrofuran
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Summary:A novel wide‐bandgap conjugated copolymer based on an imide‐functionalized benzotriazole building block containing a siloxane‐terminated side‐chain is developed. This copolymer is successfully used to fabricate highly efficient all‐polymer solar cells (all‐PSCs) processed at room temperature with the green‐solvent 2‐methyl‐tetrahydrofuran. When paired with a naphthalene diimide‐based polymer electron‐acceptor, the all‐PSC exhibits a maximum power conversion efficiency (PCE) of 10.1%, which is the highest value so far reported for an all‐PSC. Of particular interest is that the PCE remains 9.4% after thermal annealing at 80 °C for 24 h. The resulting high efficiency is attributed to a combination of high and balanced bulky charge carrier mobility, favorable face‐on orientation, and high crystallinity. These observations indicate that the resulting copolymer can be a promising candidate toward high‐performance all‐PSCs for practical applications. A novel wide‐bandgap conjugated copolymer PTzBI‐Si based on an imide‐functionalized benzotriazole unit containing a siloxane‐terminated side‐chain is developed and used to fabricate all‐polymer solar cells (all‐PSCs). When processed with a green solvent 2‐methyl‐tetrahydrofuran, the all‐PSC exhibits a power conversion efficiency of 10.1%, which represents the highest efficiency ever reported for all‐PSCs.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201703906