AUTHOR=Lin Hui , Du Xiaoyang , Li Lijuan , Zheng Caijun , Tao Silu 

TITLE=Pyrene-Imidazole Based Aggregation Modifier Leads to Enhancement in Efficiency and Environmental Stability for Ternary Organic Solar Cells

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 6 - 2018

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00578

DOI=10.3389/fchem.2018.00578

ISSN=2296-2646

ABSTRACT=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.