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4 January 2008 Organic photovoltaic devices from discotic materials
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Disk-shaped molecules can be self-assembled into columns, which may exhibit one-dimensional charge transporting properties within well-oriented domains. They are promising materials to choose in fabrication of organic photovoltaic device and to improve photovoltaic responses. In this work, a discotic triphenylene derivative 2,3,6,7,10,11-hexapentyloxytriphenylene (HAT5) was investigated and used in fabrication of organic photovoltaic devices. The device have a double-layered structure of ITO/HAT5/PTCDI-C13/Al, in which HAT5 acts as an acceptor and hole transporting layer and N,N'-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C13) acts as a donor and electron transporting layer. The device demonstrated an open circuit voltage up to 0.7V, which depended strongly on the thickness of the PTCDI-C13 layer. Function of organic/organic interface to the generation of photovoltaic effect was observed experimentally through a comparison of device made with HAT5 layers of different molecular arrangement. A higher ordered morphology obtained through annealing led to a substantial improvement in the fill factor of the device. A distinct change in open circuit voltage was also observed upon the molecular orientation though it was not what we anticipated. This work demonstrated a useful route to tune the performance of photovoltaic response of organic devices through manipulating molecular orientation and organization in the device.
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Junjie Wang, Zhiqun He, Chunxiu Zhang, Jianyuan Sun, and Guanbao Hui "Organic photovoltaic devices from discotic materials", Proc. SPIE 6841, Solid State Lighting and Solar Energy Technologies, 68411I (4 January 2008);

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