Journal
JOULE
Volume 5, Issue 6, Pages 1548-1565Publisher
CELL PRESS
DOI: 10.1016/j.joule.2021.04.007
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [51773157, 52061135206]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
- Key Laboratory of Materials Processing and Mold
- Beijing National Laboratory for Molecular Sciences [BNLMS201905]
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The study focuses on developing high-performance all-polymer solar cells by designing a novel polymer acceptor PY2F-T and enhancing efficiency through ternary blend with PYT in the PM6: PY2F-T host system. This approach significantly improves power conversion efficiency and stability, marking a promising future for the application of all-PSCs.
The field of all-polymer solar cells (all-PSCs) has experienced rapid development during the past few years, mainly driven by the design of efficient polymer acceptors (P(A)s). However, the polymer/polymer blend systems still lag far behind polymer/small molecule acceptor counterparts in power conversion efficiencies (PCEs). Here, we designed a near-infrared P-A PY2F-T and paired it with polymer donor PM6 to fabricate all-PSCs with 15.0% PCE. Afterwards, PYT as the third component was introduced into the PM6: PY2F-T host system. Because of the complementary absorption bands and finely tuned microstructures of the ternary blend, the PCE is improved up to 17.2%, with the external quantum efficiency over 80% in visible and near-infrared spectral regions. Impressively, the ternary blend exhibited less energy loss, better light- soaking and photo-thermal stabilities than did the corresponding binary systems. This work promotes the development of high-performance ternary all-polymer systems and heralds a brighter future for accelerating the possible applications of all-PSCs.
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