期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 23, 页码 13522-13530出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta03161a
关键词
-
资金
- Ministry of Science and Technology of China [2019YFA0705900, 2017YFA0206600]
- National Natural Science Foundation of China [U20A6002, 21875072, 51703172, 51973169]
- Guangdong Innovative and Entrepreneurial Research Team Program [2019ZT08L075]
- Beijing National Laboratory for Molecular Sciences [BNLMS201901]
- Fundamental Research Funds for the Central Universities (South China University of Technology) [D2190310]
The study focuses on reducing the energy loss in organic solar cells (OSCs) by introducing 3,4-dicyanothiophene (DCT), leading to significant efficiency improvement mainly through increasing the open-circuit voltage.
The power conversion efficiencies (PCEs) of organic solar cells (OSCs) based on non-fullerene acceptors are still limited by large energy loss (Delta E-loss). Herein, we report an easy and feasible way to reduce the Delta E-loss, specifically the energy losses caused by non-radiative recombination of OSCs via introducing 3,4-dicyanothiophene (DCT), a structurally simple building block with strong electron-withdrawing ability, into a state-of-the-art donor polymer PBDB-TF to form ternary copolymers. The effects of DCT content in the ternary copolymers on the optical properties, energy levels, film morphology, charge transport, photovoltaic performance, and energy losses are studied comprehensively. Significant efficiency improvement in OSCs has been achieved by the DCT-based ternary copolymers as compared to the benchmark polymer PBDB-TF mainly because of a higher open-circuit voltage enabled by the reduced non-radiative recombination energy loss. A high PCE of 16.6% and a low non-radiative recombination energy loss (0.22 eV) were achieved in ternary OSCs with the DCT-based terpolymer as the electron donor and Y6-BO and PC71BM as the electron acceptors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据