Polymerizing Ladder-type Heteroheptacene-Cored Small-Molecule Acceptors for Efficient All-Polymer Solar Cells

Peng Wang; Yu-Hang Zhu; Hong-Xin Tao; Yun-Long Ma; Dong-Dong Cai; Qi-Sheng Tu; Ruo-Chuan Liao; Qing-Dong Zheng

doi:10.1007/s10118-023-2909-3

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Polymerizing Ladder-type Heteroheptacene-Cored Small-Molecule Acceptors for Efficient All-Polymer Solar Cells

RESEARCH ARTICLE | Updated：2023-06-14

- Polymerizing Ladder-type Heteroheptacene-Cored Small-Molecule Acceptors for Efficient All-Polymer Solar Cells
  Enhanced Publication
- Chinese Journal of Polymer Science Vol. 41, Issue 7, Pages: 1018-1026(2023)
- Affiliations：
  
  a.State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
  b.School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
  c.State Key Laboratory of Coordination Chemistry, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, China
- Author bio：
  
  mayunlong@fjirsm.ac.cn (Y.L.M.)
  qingdongzheng@fjirsm.ac.cn (Q.D.Z.)
- Funds：
- DOI：10.1007/s10118-023-2909-3
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Peng Wang, Yu-Hang Zhu, Hong-Xin Tao, et al. Polymerizing Ladder-type Heteroheptacene-Cored Small-Molecule Acceptors for Efficient All-Polymer Solar Cells. [J]. Chinese Journal of Polymer Science 41(7):1018-1026(2023)
DOI：

Peng Wang, Yu-Hang Zhu, Hong-Xin Tao, et al. Polymerizing Ladder-type Heteroheptacene-Cored Small-Molecule Acceptors for Efficient All-Polymer Solar Cells. [J]. Chinese Journal of Polymer Science 41(7):1018-1026(2023) DOI： 10.1007/s10118-023-2909-3.

摘要

Two near-infrared absorbing copolymers were designed and synthesized by using ladder-type heteroheptacene-cored small-molecule acceptors as the key building blocks and thiophene as the co-monomer. All-polymer solar cells based on these polymer acceptors yield a best power conversion efficiency of 9.12%.

Abstract

One important subject in the field of all-polymer solar cells (all-PSCs) is the exploration of electron-deficient building blocks with optimized physicochemical properties to promote the performance of polymer acceptors. Here, two ladder-type heteroheptacene-containing small-molecule acceptors with branched 2-octyldodecyl or 2-hexyldecyl side-chains are synthesized and polymerized with the thiophene co-monomer to afford polymer acceptors (PW-OD and PW-HD) with strong near-infrared absorption. Experimental results reveal that the alkyl chain length has a large impact on the molecular packing behavior of the resulting polymers, which in turn affects their light-absorbing and charge transport properties, and thus the photovoltaic performance of the final devices. When blended with the polymer donor PM6, PW-HD-based all-PSCs deliver a higher power conversion efficiency (PCE) of 9.12% compared to the PCE of 6.47% for the PW-OD-based all-PSCs, mainly due to its more ordered inter-chain packing and more favorable blend morphology. This work provides a promising building block for the development of high-performance narrow-bandgap polymer acceptors and highlights the importance of side-chain substitution in optimizing the photovoltaic performance of polymer acceptors.

关键词

Keywords

All-polymer solar cellsPolymer acceptorsLadder-type heteroheptacenePower conversion efficiency

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