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Highly efficient organic optoelectronic conversion induced by electric double layers in ionic liquids
5. X. Gong, M. Tong, Y. Xia, W. Cai, S. M. Ji, Y. Cao, G. Yu, C. L. Shieh, B. Nilsson, and A. J. Heeger, Science 325, 1665 (2009);
19. A. Iwasaki, L. Hu, R. Suizu, K. Nomura, H. Yoshikawa, K. Awaga, Y. Noda, K. Kanai, Y. Ouchi, K. Seki, and H. Ito, Angew. Chem., Int. Ed. 48, 4022 (2009);
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In the present paper, highly efficient organic optoelectronic conversion has been demonstrated, induced by the electric double layers(EDLs) in ionic liquids. For the organic photocell, indium tin oxide/ionic liquid/charge-separation layer (zinc phthalocyanine:fullerene)/aluminum, in which the EDLs enhance the charge separation, a large photocurrent response can be generated. By this method, the internal quantum efficiency can reach 93% and a responsivity of 142 mA/W can be achieved. Since the EDLs show little dependence on the thickness of the ionic liquid, a very large photocurrent can be produced without the electrodes being superimposed along the light path.
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