Efficient Ternary Organic Solar Cells with a New Electron Acceptor Based on 3,4-(2,2-Dihexylpropylenedioxy)thiophene
- 5 August 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (36), 40590-40598
- https://doi.org/10.1021/acsami.0c11128
Abstract
In this work, a ternary blend strategy based on PBDB-T and two small molecular acceptors (IDTT-OB and IDT-PDOT-C6) is demonstrated to simultaneously improve the photocurrent and reduce the voltage loss in organic solar cells (OSCs). The improved photocurrent is partially due to a broad absorption spectrum of the active layer. In addition, we find that the ternary system possesses a higher degree of crystallinity, smaller domain size, higher domain purity, and higher and more balanced charge carrier mobilities in comparison with the two corresponding binary systems. The reduced voltage loss in the ternary device is mainly due to a lower energy loss (Eloss) of charge carriers. We achieve a Eloss of only 0.50 eV, which is one of the lowest values reported for the ternary non-fullerene OSCs. Our results have demonstrated that all photovoltaic parameters of ternary OSCs can be simultaneously improved by elaborately selecting the three active layer components.Funding Information
- State Administration of Foreign Experts Affairs (BP2018008)
- Ministry of Education of the People's Republic of China (BP2018008)
- Ministry of Science and Technology of the People's Republic of China (2016YFA0200700)
- Natural Science Foundation of Beijing Municipality (2182030)
- National Natural Science Foundation of China (21421003, 21574013, 21704082, 21734009, 21875182, 21975031, 51933001)
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