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- Title
The Subtle Structure Modulation of A<sub>2</sub>‐A<sub>1</sub>‐D‐A<sub>1</sub>‐A<sub>2</sub> Type Nonfullerene Acceptors Extends the Photoelectric Response for High‐Voltage Organic Photovoltaic Cells.
- Authors
Dai, Tingting; Tang, Ailing; Wang, Jiacheng; He, Zehua; Li, Xianda; Guo, Qing; Chen, Xingguo; Ding, Liming; Zhou, Erjun
- Abstract
Molecular structural modifications are utilized to improve the short‐circuit current (JSC) of high‐voltage organic photovoltaics (OPVs). Herein, the classic non‐fullerene acceptor (NFA), BTA3, is chosen as a benchmark, with BTA3b containing the linear alkyl chains on the middle core and JC14 fusing thiophene on the benzotriazole (BTA) unit as a contrast. The photovoltaic devices based on J52‐F: BTA3b and J52‐F: JC14 achieve wider external quantum efficiency responses with band edges of 730 and 800 nm, respectively than that of the device based on J52‐F: BTA3 (715 nm). The corresponding JSC increases to 14.08 and 15.78 mA cm−2, respectively, compared to BTA3 (11.56 mA cm−2). The smaller Urbach energy and higher electroluminescence efficiency guarantee J52‐F: JC14 a decreased energy loss (0.528 eV) and a high open‐circuit voltage (VOC) of 1.07 V. Finally, J52‐F: JC14 combination achieves an increased power conversion efficiency (PCE) of 10.33% than that of J52‐F: BTA3b (PCE = 9.81%) and J52‐F: BTA3 (PCE = 9.04%). Overall, the research results indicate that subtle structure modification of NFAs, especially introducing fused rings, is a simple and effective strategy to extend the photoelectric response, boosting the JSC and ensuring a high VOC beyond 1.0 V.
- Subjects
PHOTOVOLTAIC cells; ENERGY dissipation; OPEN-circuit voltage; QUANTUM efficiency; SHORT-circuit currents; THIOPHENES; PHOTOVOLTAIC power systems
- Publication
Macromolecular Rapid Communications, 2022, Vol 43, Issue 22, p1
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.202100810