Journal
ORGANIC ELECTRONICS
Volume 33, Issue -, Pages 227-234Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2016.03.032
Keywords
All-polymer solar cells; Alkyl side chain; Fluorination; Synergistic effect; Morphology
Funding
- National Natural Science Foundation of China [61176054, 61222401]
- Natural Science Foundation of Jiangsu Province [BK20130311]
- Postdoctoral Science Foundation [2014M550302, 1302015A]
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We successfully designed and synthesized a series of BDT-Qx-T based polymers as the donor polymer used in all polymer solar cells (all-PSCs). Their properties were finely tuned by side-chain modification and the introduction of electron-withdrawing fluorine atoms to polymer acceptor unit. Then we systematically investigated the effect of molecular structure on the polymer morphology and photovoltaic properties in all-PSCs. We revealed that the fluorination can optimize polymer energy level and improve the polymer coplanarity, leading to enhanced intermolecular packing and balanced carrier transport. Meanwhile, the substitution of dodecyl for 2-ethylhexyl side chains can result in improved film morphology and hole transport. As a result of the synergistic effect between fluorination and side-chain modification, we achieved a high PCE of 5.35% for the optimized all-PSCs. More importantly, our approach may become a general and effective way to tailor the polymer molecular structure for achieving high performance all-PSCs. (C) 2016 Elsevier B.V. All rights reserved.
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