@article{1f626731ad034ff2b4a37b32192e5bf9,
title = "Resolving the Mechanisms of Photocurrent Improvement in Ternary Organic Solar Cells",
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 presence of the EIECO-4 provides additional channels for ultrafast charge transfer and transport compared to binary systems. The optimum ternary blend formulations required to improve device efficiencies are reported. This work provides new insights into the fabrication of high-performance ternary OSCs.",
author = "Bi, {Peng Qing} and Hall, {Christopher R.} and Hang Yin and So, {Shu Kong} and Smith, {Trevor A.} and Ghiggino, {Kenneth P.} and Hao, {Xiao Tao}",
note = "Funding Information: 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. Funding Information: 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*%blankline%**%blankline%*",
year = "2019",
month = aug,
day = "1",
doi = "10.1021/acs.jpcc.9b06267",
language = "English",
volume = "123",
pages = "18294--18302",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "30",
}
