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Title: Enhanced hindrance from phenyl outer side chains on nonfullerene acceptor enables unprecedented simultaneous enhancement in organic solar cell performances with 16.7% efficiency

Abstract

Inner side-chain engineering on Y6 has been a proven successful in improving short-circuit current density (JSC) through fine-tuning aggregated structures of acceptors. However, it fails in tuning the lowest unoccupied molecular orbital level (LUMO) and open-circuit voltage (VOC). In this paper, we turn to focus on engineering the outer side chains on the flanking thienothiophene units with 4-hexylphenyl (PhC6) and 6-phenylhexyl (C6Ph) chains. Use of PhC6 enhances the steric effect between the attached phenyl and the ending group, which in combination with the additional conjugation effect provided by the linking phenyl leads to upshifted energy levels and increased VOC as a result. Again, substitution with the bulkier PhC6 unprecedentedly improves film-morphology with reduced paracrystalline disorder and long period and increased root-mean-square composition variations as well, leading to increased electron and hole mobilities and suppressed monomolecular recombination with JSC and fill-factor (FF) simultaneously enhanced. The PM6:BTP-PhC6-based devices yield a higher efficiency value of 16.7% than the PM6:BTP-C6Ph-based one (15.5%). Furthermore, this study shows a conceptual advance in materials design towards reducing the conflict between VOC and JSC in binary blended organic solar cells, which can be achieved by introducing bulkier chains to twist the backbone and simultaneously enhance the packing order.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [2];  [4];  [2];  [2];  [5];  [2]; ORCiD logo [5];  [3];  [6]; ORCiD logo [7]
  1. Chang'an Univ., Xi'an (China); Hong Kong Univ. of Science and Technology, Hong Kong (China)
  2. Hong Kong Univ. of Science and Technology, Hong Kong (China)
  3. North Carolina State Univ., Raleigh, NC (United States)
  4. Chang'an Univ., Xi'an (China); Chinese Academy of Sciences (CAS), Beijing (China)
  5. Hong Kong Univ. of Science and Technology, Hong Kong (China); Hong Kong Univ. of Science and Technology-Shenzhen Research Inst., Shenzhen (China)
  6. Chang'an Univ., Xi'an (China)
  7. Chinese Academy of Sciences (CAS), Beijing (China); Inner Mongolia Normal Univ., Huhehot (China)
Publication Date:
Research Org.:
Hong Kong Univ. of Science and Technology, Hong Kong (China)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1635335
Alternate Identifier(s):
OSTI ID: 1635438
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 76; Journal Issue: C; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; fullerene-free; side-chain engineering; organic solar cell; isomerization; aggregated structure

Citation Formats

Chai, Gaoda, Chang, Yuan, Peng, Zhengxing, Jia, Yanyan, Zou, Xinhui, Yu, Dian, Yu, Han, Chen, Yuzhong, Chow, Philip C. Y., Wong, Kam Sing, Zhang, Jianquan, Ade, Harald, Yang, Liwei, and Zhan, Chuanlang. Enhanced hindrance from phenyl outer side chains on nonfullerene acceptor enables unprecedented simultaneous enhancement in organic solar cell performances with 16.7% efficiency. United States: N. p., 2020. Web. doi:10.1016/j.nanoen.2020.105087.
Chai, Gaoda, Chang, Yuan, Peng, Zhengxing, Jia, Yanyan, Zou, Xinhui, Yu, Dian, Yu, Han, Chen, Yuzhong, Chow, Philip C. Y., Wong, Kam Sing, Zhang, Jianquan, Ade, Harald, Yang, Liwei, & Zhan, Chuanlang. Enhanced hindrance from phenyl outer side chains on nonfullerene acceptor enables unprecedented simultaneous enhancement in organic solar cell performances with 16.7% efficiency. United States. doi:10.1016/j.nanoen.2020.105087.
Chai, Gaoda, Chang, Yuan, Peng, Zhengxing, Jia, Yanyan, Zou, Xinhui, Yu, Dian, Yu, Han, Chen, Yuzhong, Chow, Philip C. Y., Wong, Kam Sing, Zhang, Jianquan, Ade, Harald, Yang, Liwei, and Zhan, Chuanlang. Sun . "Enhanced hindrance from phenyl outer side chains on nonfullerene acceptor enables unprecedented simultaneous enhancement in organic solar cell performances with 16.7% efficiency". United States. doi:10.1016/j.nanoen.2020.105087.
@article{osti_1635335,
title = {Enhanced hindrance from phenyl outer side chains on nonfullerene acceptor enables unprecedented simultaneous enhancement in organic solar cell performances with 16.7% efficiency},
author = {Chai, Gaoda and Chang, Yuan and Peng, Zhengxing and Jia, Yanyan and Zou, Xinhui and Yu, Dian and Yu, Han and Chen, Yuzhong and Chow, Philip C. Y. and Wong, Kam Sing and Zhang, Jianquan and Ade, Harald and Yang, Liwei and Zhan, Chuanlang},
abstractNote = {Inner side-chain engineering on Y6 has been a proven successful in improving short-circuit current density (JSC) through fine-tuning aggregated structures of acceptors. However, it fails in tuning the lowest unoccupied molecular orbital level (LUMO) and open-circuit voltage (VOC). In this paper, we turn to focus on engineering the outer side chains on the flanking thienothiophene units with 4-hexylphenyl (PhC6) and 6-phenylhexyl (C6Ph) chains. Use of PhC6 enhances the steric effect between the attached phenyl and the ending group, which in combination with the additional conjugation effect provided by the linking phenyl leads to upshifted energy levels and increased VOC as a result. Again, substitution with the bulkier PhC6 unprecedentedly improves film-morphology with reduced paracrystalline disorder and long period and increased root-mean-square composition variations as well, leading to increased electron and hole mobilities and suppressed monomolecular recombination with JSC and fill-factor (FF) simultaneously enhanced. The PM6:BTP-PhC6-based devices yield a higher efficiency value of 16.7% than the PM6:BTP-C6Ph-based one (15.5%). Furthermore, this study shows a conceptual advance in materials design towards reducing the conflict between VOC and JSC in binary blended organic solar cells, which can be achieved by introducing bulkier chains to twist the backbone and simultaneously enhance the packing order.},
doi = {10.1016/j.nanoen.2020.105087},
journal = {Nano Energy},
number = C,
volume = 76,
place = {United States},
year = {2020},
month = {6}
}

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This content will become publicly available on June 21, 2021
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