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Title: Modulation of End Groups for Low‐Bandgap Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells

Abstract

Abstract The field of nonfullerene organic solar cells (OSCs) has seen an impressive progress, largely due to advances in high‐performance small molecule acceptors (SMAs). As a large portion of the solar energy is located in the near‐infrared region, it is important to develop ultralow‐bandgap SMAs that have extended absorption in the spectral range of 800–1000 nm to maximize light absorption and efficiencies. In this work, three low‐bandgap SMAs, namely, IXIC, IXIC‐2Cl, and IXIC‐4Cl, are designed and synthesized with same fused terthieno[3,2‐ b ]thiophene donor unit and different end groups (EGs). The three SMAs all have low optical bandgap ( E g ) of 1.35, 1.30, and 1.25 eV, respectively. The chlorination on EGs can lower the energy level and broaden absorption range of the SMAs. As a result, the V oc of the devices is reduced but the J sc is significantly increased. In addition, the addition of chlorine atoms can enhance π–π stacking and crystallinity of the SMAs, which result in high fill factors. Overall, the optimum EGs are monochlorine‐substituted IC and OSCs based on PBDB‐T:IXIC‐2Cl that can achieve remarkable power conversion efficiencies (PCEs) of 12.2%, which is one of the highest PCEs for nonfullerene organic solar cells basedmore » on low‐bandgap SMAs.« less

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [1];  [1];  [2];  [1]
  1. HKUST‐Shenzhen Research Institute No. 9 Yuexing 1st Road, Hi‐tech Park Nanshan Shenzhen 518057 China, Department of Chemistry and Energy Institute Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration &, Reconstruction The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong
  2. Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1463199
Grant/Contract Number:  
DE‐AC02‐05CH11231
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Name: Advanced Energy Materials Journal Volume: 8 Journal Issue: 27; Journal ID: ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Chen, Yuzhong, Liu, Tao, Hu, Huawei, Ma, Tingxuan, Lai, Joshua Yuk Lin, Zhang, Jianquan, Ade, Harald, and Yan, He. Modulation of End Groups for Low‐Bandgap Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells. Germany: N. p., 2018. Web. doi:10.1002/aenm.201801203.
Chen, Yuzhong, Liu, Tao, Hu, Huawei, Ma, Tingxuan, Lai, Joshua Yuk Lin, Zhang, Jianquan, Ade, Harald, & Yan, He. Modulation of End Groups for Low‐Bandgap Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells. Germany. https://doi.org/10.1002/aenm.201801203
Chen, Yuzhong, Liu, Tao, Hu, Huawei, Ma, Tingxuan, Lai, Joshua Yuk Lin, Zhang, Jianquan, Ade, Harald, and Yan, He. Mon . "Modulation of End Groups for Low‐Bandgap Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells". Germany. https://doi.org/10.1002/aenm.201801203.
@article{osti_1463199,
title = {Modulation of End Groups for Low‐Bandgap Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells},
author = {Chen, Yuzhong and Liu, Tao and Hu, Huawei and Ma, Tingxuan and Lai, Joshua Yuk Lin and Zhang, Jianquan and Ade, Harald and Yan, He},
abstractNote = {Abstract The field of nonfullerene organic solar cells (OSCs) has seen an impressive progress, largely due to advances in high‐performance small molecule acceptors (SMAs). As a large portion of the solar energy is located in the near‐infrared region, it is important to develop ultralow‐bandgap SMAs that have extended absorption in the spectral range of 800–1000 nm to maximize light absorption and efficiencies. In this work, three low‐bandgap SMAs, namely, IXIC, IXIC‐2Cl, and IXIC‐4Cl, are designed and synthesized with same fused terthieno[3,2‐ b ]thiophene donor unit and different end groups (EGs). The three SMAs all have low optical bandgap ( E g ) of 1.35, 1.30, and 1.25 eV, respectively. The chlorination on EGs can lower the energy level and broaden absorption range of the SMAs. As a result, the V oc of the devices is reduced but the J sc is significantly increased. In addition, the addition of chlorine atoms can enhance π–π stacking and crystallinity of the SMAs, which result in high fill factors. Overall, the optimum EGs are monochlorine‐substituted IC and OSCs based on PBDB‐T:IXIC‐2Cl that can achieve remarkable power conversion efficiencies (PCEs) of 12.2%, which is one of the highest PCEs for nonfullerene organic solar cells based on low‐bandgap SMAs.},
doi = {10.1002/aenm.201801203},
journal = {Advanced Energy Materials},
number = 27,
volume = 8,
place = {Germany},
year = {Mon Aug 06 00:00:00 EDT 2018},
month = {Mon Aug 06 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1002/aenm.201801203

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