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Solvent mixtures for improving device efficiency of polymer photovoltaic devices
8.V. D. Mihailetchi, H. X. Xie, B. de Boer, L. M. Popescu, J. C. Hummelen, P. W. M. Blom, and L. J. A. Koster, Appl. Phys. Lett. 89, 043504 (2006).
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In this work, we used solvent mixtures, consisting of 1-chloronaphthalene (Cl-naph), one solvent with a high boiling point, and -dichlorobenzene, to prepare the polymer films for polymerphotovoltaic devices. Because of the lower vapor pressure of the solvent mixtures, the polymer films dried slower. With higher Cl-naph concentration in the organic solvent, the polymer chains had longer time to self-organize themselves. As a result, the higher degree of crystalline led to lower device series resistance, thereby increasing the performance of the photovoltaic devices.
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