Abstract
A series of isoindigo-based low-band-gap copolymers (PnTI) containing an extended thiophene unit in the donor segment of the polymer were synthesized. The results show that the extended thiophene unit with centrosymmetric conformation simultaneously broadens the polymer absorption and enhances the crystallinity and, thus, hole mobility. Consequently, with additional improved solubility, the polymer P6TI exhibits the highest PCE of 7.25% (and a high J sc of 16.24 mA cm -2 ) among isoindigo-based low-band-gap copolymers. This work demonstrates that by simply adjusting the donor segment and with relatively simple synthetic schemes, a material for high-performance and scalable PSCs will become available. This journal is
Original language | English |
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Pages (from-to) | 8026-8032 |
Number of pages | 7 |
Journal | Journal of Materials Chemistry A |
Volume | 2 |
Issue number | 21 |
DOIs | |
Publication status | Published - Jun 7 2014 |
Externally published | Yes |
ASJC Scopus subject areas
- General Chemistry
- Renewable Energy, Sustainability and the Environment
- General Materials Science