Journal
ACS NANO
Volume 8, Issue 10, Pages 10461-10470Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn503823z
Keywords
thermal and mechanical stability of polymer solar cell; rod coil copolymer; graft and block architecture; universal compatibilizer; coarse-grained molecular dynamics simulations
Categories
Funding
- National Research Foundation [2013R1A2A1A03069803]
- Global Frontier R&D Program of Center for Multiscale Energy System - Korean Government [2012M3A6A7055540]
- New & Renewable Energy Program of KETEP Grant - Ministry of Trade, Industry & Energy, Republic of Korea [20133030011330]
- KAIST-KUSTAR
- KAIST EEWS Initiative [EEWSN01140052]
- MEST
- POSTECH
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available