Journal article

Resolving the Mechanisms of Photocurrent Improvement in Ternary Organic Solar Cells

Peng Qing Bi, Christopher R Hall, Hang Yin, Shu Kong So, Trevor A Smith, Kenneth P Ghiggino, Xiao Tao Hao

JOURNAL OF PHYSICAL CHEMISTRY C | AMER CHEMICAL SOC | Published : 2019

Abstract

The ultralow band gap small-molecule IEICO-4F has been employed as a secondary acceptor in both fullerene-based (PTB7-Th:PC71BM) and nonfullerene-based (PBDB-T:ITIC) ternary organic solar cells (OSCs). Structural characterization methods combined with ultrafast spectroscopy have been applied to resolve the mechanisms, leading to the observed improvement in device efficiency upon addition of IEICO-4F. It is shown that IEICO-4F forms ternary mixed domains in the host systems and improves the device efficiency by broadening the absorption spectral range and enhancing both charge separation and charge transport. The enhanced crystallinity of the semiconductor polymer electron donors in the prese..

View full abstract

Grants

Awarded by National Natural Science Foundation of China


Awarded by Research Grant Council of Hong Kong


Awarded by ARC Centre of Excellence in Exciton Science


Funding Acknowledgements

This work was supported by the National Natural Science Foundation of China (61631166001). S.K.S. would like to acknowledge support from the Research Grant Council of Hong Kong under Grant No. N_HKBU202/16. Support from the University of Melbourne International Research and Research Training Fund (IRRTF) and the ARC Centre of Excellence in Exciton Science (CE170100026) are acknowledged. The authors would like to thank the Shanghai Synchrotron Radiation Facility (beam line BL16B1) for providing the beam time for GIXS measurements.