This work reports the synthesis, characterization, photophysical, and photovoltaic properties of five new thieno[3,2-b]benzothiophene isoindigo (TBTI)-containing low bandgap donor-acceptor conjugated polymers with a series of comonomers and different side chains. When TBTI is combined with different electron-rich moieties, even small structural variations can have significant impact on thin film morphology of the polymer:phenyl C70 butyric acid methyl ester (PCBM) blends. More importantly, high-resolution electron energy loss spectroscopy is used to investigate the phase-separated bulk heterojunction domains, which can be accurately and precisely resolved, enabling an enhanced correlation between polymer chemical structure, photovoltaic device performance, and morphology.
|Original language||English (US)|
|Journal||Macromolecular Rapid Communications|
|State||Published - Mar 5 2018|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thank the financial support by Marie Curie Intra-European Fellowship with the 7th European Community Framework Programme (No. FP7-PEOPLE-2013-IEF-622187), the Young National 1000-Talents Program of China, National Natural Science Foundation of China (Grant No. 21702240), EC FP7 SC2 (No. 610115), EC H2020 (No. 643791), and EPSRC Project Nos. EP/G037515/1 P/M024873/1 and EP/M005143/1.