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

Chen, Yuzhong; Liu, Tao; Hu, Huawei; Ma, Tingxuan; Lai, Joshua Yuk Lin; Zhang, Jianquan; Ade, Harald; Yan, He

doi:10.1002/aenm.201801203

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

Journal Article · Mon Aug 06 00:00:00 EDT 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201801203· OSTI ID:1463199

^[1]; Liu, Tao ^[1]; Hu, Huawei ^[2]; Ma, Tingxuan ^[1]; Lai, Joshua Yuk Lin ^[1]; Zhang, Jianquan ^[1]; Ade, Harald ^[2]; Yan, He ^[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
Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA

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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1463199

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 8 Journal Issue: 27; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 5170 works

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