KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Simple near-Infrared Nonfullerene Acceptors Enable Organic Solar Cells with >9% Efficiency | |
Wang, Kaili1,2; Lv, Jie1,4; Duan, Tainan1 ; Li, Zhefeng1; Yang, Qianguang4; Fu, Jiehao3; Meng, Wei1; Xu, Tongle1; Xiao, Zeyun1; Kan, Zhipeng1
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| 2019-02-20 | |
| 摘要 | Nonfullerene acceptors (NFAs) based on calamitic-shaped small molecules are being developed rapidly to improve the photoelectron conversion efficiencies (PCEs) of organic solar cells. NFAs with light absorption extended to the near-infrared (NIR) region are of interest because they play a pivotal role in both organic tandem cells and semitransparent devices. In this work, two simple acceptor-donor-acceptor-structured NFAs (CPDT-4Cl and CPDT-4F) have been designed and synthesized. Featured with dimerized 4H-cyclopenta[1,2-b:5,4-b']dithiophene (CPDT) as the electron-donating core and Cl- or F-substituted 2-(3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile as the electron-accepting unit, the absorption spectra of two NFAs are extended to the NIR region with an absorption edge at approximately 910 nm. In conjunction with the polymer donor material PBDB-T, a PCE of 9.47% was achieved by using a CPDT-4F-based device with a short-circuit current density of up to 20.1 mA/cm(2), which slightly outperforms its counterpart CPDT-4Cl (PCE = 9.28%) under the same condition. This work broadens the scope of developing new NIR NFAs with both high efficiency and easy accessibility. |
| 关键词 | organic solar cell nonfullerene near-infrared A-D-A structure easy synthesis post-treatment |
| DOI | 10.1021/acsami.8b20567 |
| 发表期刊 | ACS APPLIED MATERIALS & INTERFACES
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| ISSN | 1944-8244 |
| 卷号 | 11期号:7页码:6717-6723 |
| 收录类别 | SCI |
| WOS记录号 | WOS:000459642200004 |
| 语种 | 英语 |
