Architectural Engineering of Rod-Coil Compatibilizers for Producing Mechanically and Thermally Stable Polymer Solar Cells

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While most high-efficiency polymer solar cells (PSCs) are made of bulk heterojunction (BHJ) blends of conjugated polymers and fullerene derivatives, they have a significant morphological instability issue against mechanical and thermal stress. Herein, we developed an architecturally engineered compatibilizer, poly(3-hexylthiophene)-graft-poly(2-vinylpyridine) (P3HT-g-P2VP), that effectively modifies the sharp interface of a BHJ layer composed of a P3HT donor and various fullerene acceptors, resulting in a dramatic enhancement of mechanical and thermal stabilities. We directly measured the mechanical properties of active layer thin films without a supporting substrate by floating a thin film on water, and the enhancement of mechanical stability without loss of the electronic functions of PSCs was successfully demonstrated. Supramolecular interactions between the P2VP of the P3HT-g-P2VP polymers and the fullerenes generated their universal use as compatibilizers regardless of the type of fullerene acceptors, including mono- and bis-adduct fullerenes, while maintaining their high device efficiency. Most importantly, the P3HT-g-P2VP copolymer had better compatibilizing efficiency than linear type P3HT-b-P2VP with much enhanced mechanical and thermal stabilities. The graft architecture promotes preferential segregation at the interface, resulting in broader interfacial width and lower interfacial tension as supported by molecular dynamics simulations.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-10
Language
English
Article Type
Article
Keywords

DIBLOCK COPOLYMER; BLOCK-COPOLYMERS; HIGH-EFFICIENCY; PHOTOVOLTAIC APPLICATIONS; ORGANIC PHOTOVOLTAICS; MOLECULAR DESIGN; HIGHLY EFFICIENT; FULLERENE; PERFORMANCE; MORPHOLOGY

Citation

ACS NANO, v.8, no.10, pp.10461 - 10470

ISSN
1936-0851
DOI
10.1021/nn503823z
URI
http://hdl.handle.net/10203/194779
Appears in Collection
ME-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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