Journal
SCIENCE CHINA-CHEMISTRY
Volume 65, Issue 2, Pages 309-317Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-021-1140-x
Keywords
all-polymer solar cells; polymer acceptors; asymmetrical selenophene-fused backbone; power conversion efficiencies; stability
Categories
Funding
- APRC Grant of the City University of Hong Kong [9380086]
- Innovation and Technology Fund [ITS/497/18FP, GHP/021/18SZ]
- Office of Naval Research [N00014-20-1-2191]
- GRF grant from the Research Grants Council of Hong Kong [11307621]
- National Natural Science Foundation of China [21905103]
- Natural Science Foundation of Guangdong Province [2019A1515010761, 2019A1515011131]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- Shenzhen Science and Technology Innovation Committee [JCYJ20180507181718203]
- US Office of Naval Research [N00014-20-1-2116]
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A novel polymer acceptor, PYT-1S1Se, designed with an asymmetrical selenophene-fused framework, has been shown to optimize optical absorption and electronic properties in all-polymer solar cells. Compared with other analogs, all-PSCs derived from PYT-1S1Se demonstrate improved J(sc) and V-oc metrics, resulting in a record-high power conversion efficiency of 16.3%.
Despite the significant progress made recently in all-polymer solar cells (all-PSCs), it is still quite challenging to achieve high open-circuit voltage (V-oc) and short-circuit current density (J(sc)) simultaneously in order to further improve their performance. The recent strategy of using selenophene to replace thiophene on the Y6 based polymer acceptors has resulted in significantly improved J(sc)s of the resulting all-PSCs. However, such modifications have also depressed V-oc, which compromises the overall performance of the devices. Herein, we present the design and synthesis of a novel polymer acceptor, PYT-1S1Se, created by inserting an asymmetrical selenophene-fused framework to precisely manipulate optical absorption and electronic properties. Compared with the selenium-free analog, PYT-2S, and symmetrical selenium-fused analog, PYT-2Se, the PYT-1S1Se derived all-PSCs not only deliver optimized J(sc) (24.1 mA cm(-2)) and V-oc (0.926 V) metrics, but also exhibit a relatively low energy loss of 0.502 eV. Consequently, these devices obtain a record-high power conversion efficiency (PCE) of 16.3% in binary all-PSCs. This work demonstrates an effective molecular design strategy for balancing the trade-off between V-oc and J(sc) to achieve high-efficiency all-PSCs.
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