WFRF:(Zhang Yongqiang)
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A Narrow-Bandgap n-Type Polymer with an Acceptor-Acceptor Backbone Enabling Efficient All-Polymer Solar Cells
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- Sun, Huiliang (author)
- Southern Univ Sci & Technol SUSTech, Peoples R China; Hong Kong Univ Sci & Technol HKUST, Peoples R China; Hong Kong Univ Sci & Technol HKUST, Peoples R China
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- Yu, Han (author)
- Hong Kong Univ Sci & Technol HKUST, Peoples R China; Hong Kong Univ Sci & Technol HKUST, Peoples R China
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- Shi, Yongqiang (author)
- Southern Univ Sci & Technol SUSTech, Peoples R China
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- (creator_code:org_t)
- 2020-09-21
- 2020
- English.
- In: Advanced Materials. - : WILEY-V C H VERLAG GMBH. - 0935-9648 .- 1521-4095. ; 32
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Narrow-bandgap polymer semiconductors are essential for advancing the development of organic solar cells. Here, a new narrow-bandgap polymer acceptor L14, featuring an acceptor-acceptor (A-A) type backbone, is synthesized by copolymerizing a dibrominated fused-ring electron acceptor (FREA) with distannylated bithiophene imide. Combining the advantages of both the FREA and the A-A polymer, L14 not only shows a narrow bandgap and high absorption coefficient, but also low-lying frontier molecular orbital (FMO) levels. Such FMO levels yield improved electron transfer character, but unexpectedly, without sacrificing open-circuit voltage (V-oc), which is attributed to a small nonradiative recombination loss (E-loss,E-nr) of 0.22 eV. Benefiting from the improved photocurrent along with the high fill factor andV(oc), an excellent efficiency of 14.3% is achieved, which is among the highest values for all-polymer solar cells (all-PSCs). The results demonstrate the superiority of narrow-bandgap A-A type polymers for improving all-PSC performance and pave a way toward developing high-performance polymer acceptors for all-PSCs.
Subject headings
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
Keyword
- acceptor-acceptor polymers; all-polymer solar cells; narrow bandgap; nonradiative recombination loss; polymer acceptors
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Sun, Huiliang
- Yu, Han
- Shi, Yongqiang
- Yu, Jianwei
- Peng, Zhongxiang
- Zhang, Xianhe
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- Liu, Bin
- Wang, Junwei
- Singh, Ranbir
- Lee, Jaewon
- Li, Yongchun
- Wei, Zixiang
- Liao, Qiaogan
- Kan, Zhipeng
- Ye, Long
- Yan, He
- Gao, Feng
- Guo, Xugang
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- About the subject
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Linköping University
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