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Title: Overcoming the trade-off between Voc and Jsc: Asymmetric chloro-substituted two-dimensional benzo[1,2-b:4,5-b']dithiophene-based polymer solar cells

Abstract

To achieve the high PCE and simultaneously overcome the trade-off between open circuit voltage (Voc) and short-circuit current density (J(sc), the reasonable design of the donor material is still a great challenge in nonfullerene polymer solar cells (PSCs). In this paper, a pair of asymmetric 2D BDT-based wide band gap polymers, named PBPTBz-1C1 and PRPTBz-2C1, respectively, were designed and synthesized through simultaneously introducing a chloro-substituted thiophene and another alkoxylphenyl groups as side chains onto the same BDT unit. As expected, the polymers PBPTBz-1C1 and PBPTBz-2C1 exhibit the deeper HOMO levels of - 5.32 and - 5.41 eV, respectively, compared with the HOMO value of - 5.27 eV for chlorine -free substituted polymer PBPTBz-OCI. Therefore, the PBPTBz-2Cl:IT-M based PSCs exhibited a higher Voc of 0.99 V, with an enhanced Jsc of 14.92 mA cm-2 and PCE of 7.18%. The Voc, Jsc and PCE were simultaneously enhanced from PEPTBz-OCLIT-M to PBPTBz-1C1:IT-M, then to PBPTBz-2C1:1T-M based PSCs successively. These results demonstrate that the challenge of the trade-off between Voc and Jsc could be overcome through the asymmetric strategy of the chlorosubstituted thiophene and alkylphenyl groups as different side chains onto the same BDT unit. Hence, considering the low cost of starting materials andmore » convenient introduction of chlorine atoms, the asymmetric chlorination of the side chain of BDT unit would be the great potential for achieving the high-performance PSCs.« less

Authors:
 [1];  [2];  [2];  [3];  [4];  [1];  [5];  [2]
  1. Peking University, Shenzhen (China)
  2. Southern University of Science and Technology, Shenzhen (China)
  3. The University of Chicago, IL (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States); The University of Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1493727
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Dyes and Pigments
Additional Journal Information:
Journal Volume: 162; Journal Issue: C; Journal ID: ISSN 0143-7208
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 14 SOLAR ENERGY; asymmetric chloro-substitution; low photon energy loss; polymer solar cells; side-chain engineering

Citation Formats

Chao, Pengjie, Liu, Longzhu, Qu, Jianfei, He, Qiming, Gan, Shenglong, Meng, Hong, Chen, Wei, and He, Feng. Overcoming the trade-off between Voc and Jsc: Asymmetric chloro-substituted two-dimensional benzo[1,2-b:4,5-b']dithiophene-based polymer solar cells. United States: N. p., 2018. Web. doi:10.1016/j.dyepig.2018.10.071.
Chao, Pengjie, Liu, Longzhu, Qu, Jianfei, He, Qiming, Gan, Shenglong, Meng, Hong, Chen, Wei, & He, Feng. Overcoming the trade-off between Voc and Jsc: Asymmetric chloro-substituted two-dimensional benzo[1,2-b:4,5-b']dithiophene-based polymer solar cells. United States. https://doi.org/10.1016/j.dyepig.2018.10.071
Chao, Pengjie, Liu, Longzhu, Qu, Jianfei, He, Qiming, Gan, Shenglong, Meng, Hong, Chen, Wei, and He, Feng. Sun . "Overcoming the trade-off between Voc and Jsc: Asymmetric chloro-substituted two-dimensional benzo[1,2-b:4,5-b']dithiophene-based polymer solar cells". United States. https://doi.org/10.1016/j.dyepig.2018.10.071. https://www.osti.gov/servlets/purl/1493727.
@article{osti_1493727,
title = {Overcoming the trade-off between Voc and Jsc: Asymmetric chloro-substituted two-dimensional benzo[1,2-b:4,5-b']dithiophene-based polymer solar cells},
author = {Chao, Pengjie and Liu, Longzhu and Qu, Jianfei and He, Qiming and Gan, Shenglong and Meng, Hong and Chen, Wei and He, Feng},
abstractNote = {To achieve the high PCE and simultaneously overcome the trade-off between open circuit voltage (Voc) and short-circuit current density (J(sc), the reasonable design of the donor material is still a great challenge in nonfullerene polymer solar cells (PSCs). In this paper, a pair of asymmetric 2D BDT-based wide band gap polymers, named PBPTBz-1C1 and PRPTBz-2C1, respectively, were designed and synthesized through simultaneously introducing a chloro-substituted thiophene and another alkoxylphenyl groups as side chains onto the same BDT unit. As expected, the polymers PBPTBz-1C1 and PBPTBz-2C1 exhibit the deeper HOMO levels of - 5.32 and - 5.41 eV, respectively, compared with the HOMO value of - 5.27 eV for chlorine -free substituted polymer PBPTBz-OCI. Therefore, the PBPTBz-2Cl:IT-M based PSCs exhibited a higher Voc of 0.99 V, with an enhanced Jsc of 14.92 mA cm-2 and PCE of 7.18%. The Voc, Jsc and PCE were simultaneously enhanced from PEPTBz-OCLIT-M to PBPTBz-1C1:IT-M, then to PBPTBz-2C1:1T-M based PSCs successively. These results demonstrate that the challenge of the trade-off between Voc and Jsc could be overcome through the asymmetric strategy of the chlorosubstituted thiophene and alkylphenyl groups as different side chains onto the same BDT unit. Hence, considering the low cost of starting materials and convenient introduction of chlorine atoms, the asymmetric chlorination of the side chain of BDT unit would be the great potential for achieving the high-performance PSCs.},
doi = {10.1016/j.dyepig.2018.10.071},
journal = {Dyes and Pigments},
number = C,
volume = 162,
place = {United States},
year = {2018},
month = {11}
}

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