Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 12, Pages 5995-6003Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00520g
Keywords
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Funding
- Swedish Research Council
- Swedish Research Council Formas
- Wallenberg Foundation [2017.0186, 2016.0059]
- National Natural Science Foundation of China [21604021]
- China Scholarship Council (CSC) [201808430041]
- Hunan Provincial Natural Science Foundation [2018JJ3141]
- National Natural Science Foundation of China (NSFC) [51573120, 51773142, 91633301]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- China Scholarship Council [201608440294]
- DFG [BR 4031/13-1, SFB 953, 182849149]
- Innovation fund Denmark (INKA project)
- Sino-Danish Centre for Education and Research (SDC)
- Deutsche Forschungsgemeinschaft (DFG) [INST 90/825-1 FUGG, INST 90/751-1 FUGG, INST 90/827-1 FUGG]
- Cluster of Excellence Engineering of Advanced Materials (EAM)
- research training group GRK 1896 In Situ Microscopy with Electrons, X-rays and Scanning Probes
- research unit FOR 1878 Functional Molecular Structures on Complex Oxide Surfaces
- German Federal Ministry of Education and Research (BMBF) [05K16WEB, 05K16WE1]
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Great attention has been paid to developing low bandgap non-fullerene acceptors (NFAs) for matching wide bandgap donor polymers to increase the photocurrent and therefore the power conversion efficiencies (PCEs) of NFA organic solar cells, while pyrene-core based acceptor-donor-acceptor (A-D-A) NFAs have been mainly reported via the 2,9-position connection due to their bisthieno[3 ',2 '-b']thienyl[a,h]pyrene fused via a five-membered ring bridge at the ortho-position of pyrene as the representative one named FPIC5, which has prohibited further narrowing their energy gap. Herein, an acceptor FPIC6 was exploited by creating the 1,8-position connection through fusing as bisthieno[3 ',2 '-b ']thienyl[f-g,m-n]pyrene linked at the bay-position via a six-membered bridge, with enhanced push-pull characteristics within such A-D-A structure. As a structural isomer of FPIC5, FPIC6 exhibited a much lower bandgap of 1.42 eV (1.63 eV for FPIC5). Therefore, the photocurrent and PCE of PTB7-Th:FPIC6 cells were improved to 21.50 mA cm(-2) and 11.55%, respectively, due to the balanced mobilities, better photoluminescence quenching efficiency and optimized morphology, which are both similar to 40% better than those of PTB7-Th:FPIC5 cells. Our results clearly proved that a pyrene fused core with 1,8-position connection with electron-withdrawing end groups instead of 2,9-position connection is an efficient molecular design strategy to narrow the optical bandgap and improve the photovoltaic performance of NFA based OSCs.
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