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题名: All-small-molecule organic solar cells based on an electron donor incorporating binary electron-deficient units
作者: Feng, Guitao1, 2; Xu, Yunhua1; Zhang, Jianqi3; Wang, Zhaowei4; Zhou, Yi4; Li, Yongfang2, 4; Wei, Zhixiang3; Li, Cheng2; Li, Weiwei2
刊名: JOURNAL OF MATERIALS CHEMISTRY A
发表日期: 2016
卷: 4, 期:16, 页:6056-6063
收录类别: SCI
英文摘要: In this work, solution-processed organic solar cells with conjugated small molecules both as electron donors and electron acceptors were studied, where the influence of the chemical structures of the donor and acceptor on the device performance was systematically investigated. A small molecular donor incorporating binary electron-deficient units, diketopyrrolopyrrole and pentacyclic aromatic bislactam, was synthesized to provide a low band gap of 1.65 eV and low-lying energy levels. Three molecules, from a fullerene derivative to non-fullerene perylene bisimide-based acceptors, were selected as electron acceptors to construct organic solar cells. The results showed that fullerene-based solar cells provided power conversion efficiencies (PCEs) of up to 4.8%, while the non-fullerene solar cells also exhibited promising PCEs of 2.4% and 3.5%, with a photoresponse of up to 750 nm. Further analysis of the bulk-heterojunction systems between donors and acceptors revealed that the relatively low carrier mobilities of the non-fullerene acceptors and the large phase separations are mainly responsible for the less efficient solar cells. Our results demonstrate that molecules containing several electron-deficient units can effectively reduce the band gap of small molecules, and thus offer great potential for realizing high performance fullerene and non-fullerene solar cells.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/36065
Appears in Collections:有机固体实验室_期刊论文

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作者单位: 1.Beijing Jiaotong Univ, Sch Sci, Dept Chem, Beijing 100044, Peoples R China
2.Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China
4.Soochow Univ, Coll Chem Chem Engn & Mat Sci, Lab Adv Optoelect Mat, Suzhou 215123, Jiangsu, Peoples R China
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