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Improvement in open circuit voltage of organic solar cells by inserting a thin phosphorescent iridium complex layer
3.H. Y. Chen, J. H. Hou, S. Q. Zhang, Y. J. Liang, G. W. Yang, Y. Yang, L. P. Yu, Y. Wu, and G. Li, Nat. Photonics 3, 649 (2009).
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17.J. S. Yu, J. Huang, H. Lin, and Y. D. Jiang, Theoretical and experimental analysis of exciton diffusion length of mixed donor materials based on OSCs by doping with phosphorescent iridium complex, J. Appl. Phys. (to be published).
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The authors develop organic solar cells (OSCs) with a multicharge separation (MCS)interface by inserting thin layer of phosphorescent bis(2-(4-tertbutylphenyl) benzothiazolato-) iridium (acetylacetonate) comparing with copper phthalocyanine (CuPc) between pentacene/heterojunction. The result showed that open circuit voltage is remarkably enhanced without obviously changing external quantum efficiency and short-circuit current density. As a result, power conversion efficiency is improved from 1.53% for pentacene/device to 1.83% with sandwich layer and 1.98% with CuPc. Moreover, a suitable equivalent circuit model is proposed to intuitively reveal the inner photogeneration process of OSC with MCSinterface.
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