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High efficiency organic photovoltaic cells based on a vapor deposited squaraine donor
3.S. J. Chung, S. J. Zheng, T. Odani, L. Beverina, J. Fu, L. A. Padilha, A. Biesso, J. M. Hales, X. W. Zhan, K. Schmidt, A. J. Ye, E. Zojer, S. Barlow, D. J. Hagan, E. W. Van Stryland, Y. P. Yi, Z. G. Shuai, G. A. Pagani, J. L. Bredas, J. W. Perry, and S. R. Marder, J. Am. Chem. Soc. 128, 14444 (2006).
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2,4-bis[4-(-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ) is used as a donor material in vapor deposited organic heterojunctionphotovoltaic cells.Devices with the structure indium tin oxide/SQ /bathocuproine , where , 110, 150, and were compared. Devices with exhibited a power conversion efficiency of 3.1% under , AM1.5G simulated solar irradiation, giving an open circuit voltage of , a short circuit current of , and a fill factor of . Thicker SQ films lead to lower short circuit currents and fill factors, giving conversion efficiencies in the range of 2.6% to 3.2%. The demonstration of sublimable SQ as a donor material opens up a family of compounds for use in small molecule based heterojunctionphotovoltaics.
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