Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells

Hang Wang; Hao Lu; Ya-Nan Chen; Andong Zhang; Yuqiang Liu; Cai'e Zhang; Yahui Liu; Xinjun Xu; Zhishan Bo

doi:10.1007/s10118-022-2796-z

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Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells

RESEARCH ARTICLE | Updated：2022-07-21

- Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells
- Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells
- Chinese Journal of Polymer Science 2022年40卷第8期页码：996-1002
- Affiliations：
  
  a.College of Textiles & Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao 266071, China
  b.Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China
  c.College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
- Author bio：
  
  liuyh@qdu.edu.cn (Y.L)
  zsbo@bnu.edu.cn (Z.B)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 51933001 and 22109080).
- DOI：10.1007/s10118-022-2796-z
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Hang Wang, Hao Lu, Ya-Nan Chen, 等. Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):996-1002.

Hang Wang, Hao Lu, Ya-Nan Chen, et al. Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):996-1002.
Hang Wang, Hao Lu, Ya-Nan Chen, 等. Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):996-1002. DOI： 10.1007/s10118-022-2796-z.

Hang Wang, Hao Lu, Ya-Nan Chen, et al. Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells[J]. Chinese Journal of Polymer Science, 2022,40(8):996-1002. DOI： 10.1007/s10118-022-2796-z.

摘要

The BDT based regio-regular polymer ,reg-PTF, and the corresponding random polymer ,ran-PTF, are developed as donor materials. Acceptors with different energy level are severally match with the two polymers can give the significant different PCE due to the different energy level offset between the donor and acceptor materials.

Abstract

In this work, regio-regular and random polymers (,reg-PTF, and ,ran-PTF,) comprising benzodithiophene and 3-fluorothiophene units are developed to investigate the influence of polymer chain regularity on the photovoltaic performance. Interestingly,reg-PTF, exhibits higher HOMO energy level (~0.2 eV) than that of ,ran-PTF, due to the more ordered molecular structure and higher crystallization. As the result, the HOMO energy level offset between donor and acceptor can be well controlled by selecting different acceptors. Using BTP-ec9-4F with a much deep HOMO energy level as acceptor,reg-PTF,-based devices display an inferior PCE of 7.66% compared with ,ran-PTF, based ones (11.78%) due to the too large HOMO energy levels offset. When blending with Y18-1F, the PCE of ,reg-PTF,-based devices is increased to 13.23% due to the appropriate energy level. In comparison, the ,ran-PTF,-based devices nearly do not work because of the negative HOMO energy levels offset. This work indicates that both the polymer chain regularity and the energy level offset between the donor and acceptor material are important to the performance of organic solar cells.

关键词

Keywords

Organic solar cellsPolymer donorRegio-regular polymerRandom polymerEnergy level offset

references

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