Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 12, Pages 5017-5027Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee01828g
Keywords
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Funding
- Swedish Research Council [2015-04853, 2016-06146, 2019-04683]
- Swedish Research Council Formas
- Wallenberg Foundation [2017.0186, 2016.0059]
- Innovation fund Denmark (INKA project)
- Sino-Danish Centre for Education and Research (SDC)
- King Abdullah University of Science and Technology (KAUST) [OSR-2018-CARF/CCF-3079]
- Office of Sponsored Research (OSR) [OSR-2018-CARF/CCF-3079]
- Jinan University Postdoctoral Science Foundation
- China Postdoctoral Science Foundation [2020M673054]
- National Natural Science Foundation of China [22005121, 61805009]
- Vinnova [2019-04683] Funding Source: Vinnova
- Swedish Research Council [2019-04683, 2015-04853] Funding Source: Swedish Research Council
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Obtaining both high open-circuit voltage (V-oc) and short-circuit current density (J(sc)) has been a major challenge for efficient all-polymer solar cells (all-PSCs). Herein, we developed a polymer acceptor PF5-Y5 with excellent optical absorption capability (onset extending to similar to 880 nm and maximum absorption coefficient exceeding 105 cm(-1) in a film), high electron mobility (3.18 x 10(3) cm(2) V-1 s(-1)) and high LUMO level (-3.84 eV) to address such a challenge. As a result, the PBDB-T:PF5-Y5-based all-PSCs achieved a high power conversion efficiency of up to 14.45% with both a high Voc (0.946 V) and a high Jsc (20.65 mA cm(-2)), due to the high and broad absorption coverage, small energy loss (0.57 eV) and efficient charge separation and transport in the device, which are among the best values in the all-PSC field. In addition, the all-PSC shows a similar to 15% improvement in PCE compared to its counterpart small molecule acceptor (Y5)-based device. Our results suggest that PF5-Y5 is a very promising polymer acceptor candidate for applications in efficient all-PSCs.
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