期刊
DYES AND PIGMENTS
卷 185, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.108892
关键词
Organic solar cells; Nonfullerene acceptors; Naphthalene; Six-member-ring; Power conversion efficiency
资金
- National Natural Science Foundation of China [21604021]
- China Scholarship Council (CSC) [201808430041, 201708370115, 201808620028]
- Hunan Provincial Natural Science Foundation [2018JJ3141]
- School of Materials Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications
- Knut and Alice Wallenberg Foundation [2016.0059]
- Swedish Government Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 200900971]
- Sino-Danish Centre for Education and Research (SDC)
- Hunan Furong Scholarship, China
- China Scholarship Council [201908440047]
- NSFC project [11272093]
- Guangzhou Municipal Science and Technology Bureau [201804010501, 201904010381]
- Department of Education of Guangdong Province [2018GKTSCX041, 2017GKQNCX005]
- Department of Science and Technology of Guangdong Province [2016A010103046]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-07]
- Swedish Research Council [2015-04853, 2016-06146, 2019-04683]
- Swedish Research Council Formas
- Wallenberg Foundation [2016.0059, 2017.0186]
The fusion of ring-shaped donor cores in state-of-the-art A-D-A nonfullerene acceptors has been shown to optimize light-harvesting, molecular orbital levels, and photovoltaic properties, demonstrating great potential for organic photovoltaic applications.
Comprehensive design ideas on the fused-ring donor-core in state-of-the-art acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) are still of great importance for regulating the electron push-pull effect for the sake of optimal light-harvesting, frontier molecular orbital levels, and finally their photovoltaic properties. Herein, thieno[3,2-b]thiophenes were fused in bay-area of naphthalene via six-member-ring connection, resulting in the formation of dihydropyrenobisthieno[3,2-b]thiophene based octacyclic ladder-type donor core, which was flanked by two 1,1-dicyanomethylene-3-indanone (IC) acceptor motifs with and without 5,6-diflourination, namely PTT-IC and PTT-2FIC, respectively, as novel efficient A-D-A fused-ring electron acceptors (FREAs). Compared with PTT-IC, fluorinated PTT-2FIC possesses narrower optical bandgap of 1.48 eV, better pi-pi stacking, and its PBDB-T:PTT-2FIC blend film exhibited better morphology, and better hole and electron mobility. As a result, nonfullerene solar cells using PBDB-T:PTT-2FIC as the active layer achieved a decent PCE of 10.40%, with an open-circuit voltage (V-OC) of 0.87 V, a fill factor (FF) of 0.65, and a much higher short-circuit current (J(SC)) of 18.26 mA/cm(2). Meanwhile, the PBDB-T:PTT-IC cells delivered a lower J(SC) of 12.58 mA/cm(2) but a higher V-OC of 0.99 V, thus resulting in a PCE of 7.39% due to its wider optical bandgap of 1.58 eV and higher LUMO energy level. These results demonstrated that NFAs based on fused-ring donor core from fusing thieno [3,2-b]thiophenes with naphthalene via six-member-ring connection are promising for organic photovoltaic applications.
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