Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 5, Pages 2322-2329Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202010596
Keywords
fill factor; morphology; organic solar cells; power conversion efficiency; terpolymers
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51773142, 51973146]
- Jiangsu Provincial Natural Science Foundation [BK20190099]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- NSFC project [61774077]
- China Postdoctoral Science Foundation [2020M673054]
- National Natural Science Foundation of China [52073207]
- Peiyang Scholar Program of Tianjin University
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-11]
- U.S. Department of the Navy, Office of Naval Research (ONR) [N000141712204]
- U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Defense (DOD) [N000141712204] Funding Source: U.S. Department of Defense (DOD)
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In this study, a ternary copolymerization approach was used to develop a new terpolymer donor PM6-Tz20 with improved active layer morphology, leading to enhanced PCE in OSCs. By replacing Al with Ag as the cathode, the champion PCE was further improved, demonstrating the effectiveness of molecular design strategy in optimizing OSC performance.
Regulating molecular structure to optimize the active layer morphology is of considerable significance for improving the power conversion efficiencies (PCEs) in organic solar cells (OSCs). Herein, we demonstrated a simple ternary copolymerization approach to develop a terpolymer donor PM6-Tz20 by incorporating the 5,5 '-dithienyl-2,2 '-bithiazole (DTBTz, 20 mol%) unit into the backbone of PM6 (PM6-Tz00). This method can effectively tailor the molecular orientation and aggregation of the polymer, and then optimize the active layer morphology and the corresponding physical processes of devices, ultimately boosting FF and then PCE. Hence, the PM6-Tz20: Y6-based OSCs achieved a PCE of up to 17.1% with a significantly enhanced FF of 0.77. Using Ag (220 nm) instead of Al (100 nm) as cathode, the champion PCE was further improved to 17.6%. This work provides a simple and effective molecular design strategy to optimize the active layer morphology of OSCs for improving photovoltaic performance.
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