Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Organic photovoltaic devices (OPVs) have attracted attention because of their lower cost, lighter weight, easier fabrication, and improved possibility of fabricating flexible devices in comparison with conventional inorganic semiconductor photovoltaic devices. In the bulk heterojunction (BHJ) of the photoactive blend film of OPVs, the polymer electron-donor and the fullerene electron-acceptor materials form an interpenetrating network to optimize the exciton dissociation and charge transport.
In this study, we synthesized some PCBM[1]-like C60 derivatives as well as non-PCBM-type C60 derivatives, such as C60(CH3OCOC6H5)8. We tested OPV performance of the new fullerene electron-acceptor materials fabricated with P3HT (PCE; e.g, 60-MPCM 2.05% , 70-MPPE 2.33% ).
The performance of the novel fullerene PCBM-like C60 derivatives was found to be lower than that of PCBM, although the VOC of the thiophene derivatives 5-EThCEB and 3-MeOThCEB is slightly higher than that of PCBM. The electron-donating property of thiophene might be assumed to increase the VOC. As for non-PCBM-type C60 derivatives, we have succeeded in the regioselective synthesis of octaalkoxyfullerenes, C60(OR)8, from structurally known C60Br8[2] as a starting material. The OPV performance of P3HT/C60(CH3OCOC6H5)8 has demonstrated 0.2% PCE. The LUMO level of this compound is raised to – 3.56 eV compared with C60 (– 3.89 eV); thus, it seems a potential candidate for a new non-PCBM-type acceptor.
This work was supported by the Bilateral International Collaborative R&D Program (GT-2009-CL-OT-0058), Ministry of Knowledge and Economy, Republic of Korea and the MEXT-Supported Program for the Strategic Research Foundation at Private Universities, Japan.
[1] Hummelen, J. C.; Knight, B. W.; LePeq, F.; Wudl, F.; Yao, J.; Wilkins, C. L. J. Org. Chem. 1995, 60, 532–538. [2] Birkett, P. R.; Hitchcock, P. B.; Kroto, H. W.; Taylor, R.; Walton, D. R. M. Nature 1992, 357, 479–481.
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