Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells

Meng-Han Wang; Zhong-Yuan Xue; Zhi-Wei Wang; Wei-Hua Ning; Yu Zhong; Ya-Nan Liu; Chun-Feng Zhang; Sven Huettner; You-Tian Tao

doi:10.1007/s10118-018-2128-5

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Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells

ARTICLE | Updated：2021-02-18

- Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells
- Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells
- Chinese Journal of Polymer Science 2018年36卷第10期页码：1129-1138
- Affiliations：
  
  a.Key Lab for Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing 211816, China
  b.National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
  c.Macromolecular Chemistry I, Universität Bayreuth, 30 Universitätsstr, 95447, Bayreuth, Germany
- Author bio：
  
  iamyttao@njtech.edu.cn
- Funds：
  
  This work was financially supported by the the National Natural Science Foundation of China (No. 61761136013) and the Natural Science Foundation of Jiangsu Province (Nos. BK20160042 and BK20160990). S.H. is thankful to DFG (392306670) and Y.Z. is thankful to the CSC for financial support. Parts of this research were undertaken at the SAXS/WAXS beamline of the Australian Synchrotron.
- DOI：10.1007/s10118-018-2128-5
  中图分类号：
- 收稿：2018-01-17，
  
  录用：2018-2-14，
  
  网络首发：2018-03-29，
  
  纸质出版：2018-10
- Accepted：
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Citation: Wang, M. H.; Xue, Z. Y.; Wang, Z. W.; Ning, W. H.; Zhong, Y.; Liu, Y. N.; Zhang, C. F.; Huettner, S.; Tao, Y. T. Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells. Chinese J. Polym. Sci. 2018, 36(10), 1129–1138.

Meng-Han Wang, Zhong-Yuan Xue, Zhi-Wei Wang, et al. Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2018, 36(10): 1129-1138.
Citation: Wang, M. H.; Xue, Z. Y.; Wang, Z. W.; Ning, W. H.; Zhong, Y.; Liu, Y. N.; Zhang, C. F.; Huettner, S.; Tao, Y. T. Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells. Chinese J. Polym. Sci. 2018, 36(10), 1129–1138. DOI： 10.1007/s10118-018-2128-5.

Meng-Han Wang, Zhong-Yuan Xue, Zhi-Wei Wang, et al. Slight Structural Disorder in Bithiophene-based Random Terpolymers with Improved Power Conversion Efficiency for Polymer Solar Cells[J]. Chinese Journal of Polymer Science, 2018, 36(10): 1129-1138. DOI： 10.1007/s10118-018-2128-5.

摘要

Abstract

A series of random terpolymers

−

were designed and synthesized by randomly embedding 5 mol%

10 mol%

15 mol% and 25 mol% feed ratios of low cost 2

2-bithiophene as the third monomer to the famous donor-acceptor (D-A) type copolymer

PTB7-Th

(

). All polymers showed similar molecular weight with number-average molecular weight (

) and weight-average molecular weight (

) in the range of (59−74) and (93−114) kg·mol

−1

respectively

to ensure a fair comparison on the structure-property relationships. Compared with the control copolymer

PTB7-Th

the random terpolymers exhibited enhanced absorption intensity in a wide range from 400 nm to 650 nm in both solution and film as well as in polymer/PC

BM blends. From grazing incident wide-angle X-ray diffraction (GIWAXS)

compared with the regularly alternated copolymer

PTB7-Th

the random terpolymers demonstrated mild structural disorder with reduced (100) lamellar stacking and slightly weakened (010)

stacking for the polymers as well as slightly reduced PC

BM aggregation in polymer/PC

BM blends. However

the measured hole mobility for terpolymers ((1.20−3.73) × 10

−4

·V

−1

·s

−1

) was evaluated to be comparable or even higher than 1.35 × 10

−4

·V

−1

·s

−1

of the alternative copolymer. Enhanced average power conversion efficiency (PCE) from 7.35% to 8.11% and 7.79% to 8.37% was observed in both conventional and inverted device architectures from copolymer

to terpolymers

while further increasing the 2

2-bithiophene feed ratio decreased the PCE.

关键词

Keywords

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