Original Research ARTICLE
Pyrene-imidazole based aggregation modifier leads to enhancement in efficiency and environmental stability for ternary organic solar cells
- 1University of Electronic Science and Technology of China, China
A novel pyrene-imidazole derivative (PyPI), which can form effcient π-π stacking in solid film, has been utilized in organic solar cells (OSCs). The stacking of small molecule PyPI can facilitate charge transfer and suppress fullerene aggregation. As a result, PTB7-Th: PyPI: PC71BM based ternary OSC exhibits a high PCE of 10.36%, which presents 15.88% enhancement than the binary device (8.94%). Concurrently, the ternary OSC shows much better thermal and light illumination stability. Under continuous 60 oC annealing for 3 hours in atmosphere, the device still remains 94.13% efficiency than the pristine state, while the control device only keeps 52.47% PCE. In the condition of constant illuminating under AM 1.5G irradiation (100 mW cm-2) in atmosphere, the PCE of OSC keeps at 72.50%. The high conversion efficiency and excellent environmental stability of PyPI based ternary OSC narrowed the gap between laboratory investigation and industrial production.
Keywords: pyrene-imidazole, Π-Π stacking, Organic Solar Cells, fullerene aggregation, environmental stability
Received: 14 Sep 2018;
Accepted: 06 Nov 2018.
Edited by:Chuanlang Zhan, Institute of Chemistry (CAS), China
Reviewed by:Zhan'Ao Tan, North China Electric Power University, China
In Hwan Jung, Kookmin University, South Korea
Copyright: © 2018 Lin, Du, Li, Zheng and Tao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Prof. Silu Tao, University of Electronic Science and Technology of China, Chengdu, China, firstname.lastname@example.org