期刊
SCIENCE CHINA-CHEMISTRY
卷 64, 期 8, 页码 1380-1388出版社
SCIENCE PRESS
DOI: 10.1007/s11426-021-1020-7
关键词
all-polymer solar cells; morphology; non-fully conjugated polymer acceptors; energy loss; power conversion efficiency
资金
- Swedish Research Council [2015-04853, 2016-06146, 2019-04683]
- Swedish Research Council Formas
- Knut and Alice Wallenberg Foundation [2017.0186, 2016.0059]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-07]
- Swedish Energy Council [48598-1]
- China Postdoctoral Science Foundation [2020M673054]
- Postdoctoral Fund of Jinan University
- National Natural Science Foundation of China [61774077, 22005121]
- Sino-Danish Centre for Education and Research
- Science and Technology Program of Shanxi Province [2019JQ-244]
- Swedish Research Council [2015-04853, 2019-04683] Funding Source: Swedish Research Council
- Vinnova [2019-04683] Funding Source: Vinnova
A novel non-fully conjugated polymer acceptor PFY-2TS with a low bandgap was developed and showed improved performance in all-polymer solar cells with a PCE of 12.31% and reduced energy loss. This study demonstrated that non-fully conjugated polymers as a new class of acceptor materials are very promising for the development of high-performance all-polymer solar cells.
Anon-fully conjugated polymer as a new class of acceptor materials has shown some advantages over its small molecular counterpart when used in photoactive layers for all-polymer solar cells (all-PSCs), despite a low power conversion efficiency (PCE) caused by its narrow absorption spectra. Herein, a novel non-fully conjugated polymer acceptor PFY-2TS with a low bandgap of similar to 1.40 eV was developed, via polymerizing a large pi-fused small molecule acceptor (SMA) building block (namely YBO) with a non-conjugated thioalkyl linkage. Compared with its precursor YBO, PFY-2TS retains a similar low bandgap but a higher LUMO level. Moreover, compared with the structural analog of YBO-based fully conjugated polymer acceptor PFY-DTC, PFY-2TS shows similar absorption spectrum and electron mobility, but significantly different molecular crystallinity and aggregation properties, which results in optimal blend morphology with a polymer donor PBDB-T and better device physical processes in all-PSCs. As a result, PFY-2TS-based all-PSCs achieved a PCE of 12.31% with a small energy loss of 0.56 eV enabled by the reduced non-radiative energy loss (0.24 eV), which is better than that of 11.08% for the PFY-DTC-based ones. Our work clearly demonstrated that non-fully conjugated polymers as a new class of acceptor materials are very promising for the development of high-performance all-PSCs.
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