الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Non-renewable energy comes from sources that will eventually run out, solar energy which is one source of renewable energy is one of these alternatives and the only one that can in principle power all of our society. Organic solar cells (OSC) which are made from organic materials have great potential for providing inexpensive and more flexible energy options. Key for the OSC performance is the micro-structure of the light-absorbing organic bulk heterojunction which is the active layer containing both the donor and the acceptor. To study this, Organic solar films composed of both fullerene C60 as electron acceptor and different mole percentages of di-[4-(N,N-di-p-tolyl-amino)-phenyl]-cyclohexane (TAPC) as electron donor were evaporated in vacuum in different mixing ratios (5, 50 & 95 mol%) on an ITO-coated glass substrate held at room temperature and at 110°C. The micro-structure of the C60:TAPC heterojunction was studied by grazing incidence wide angle X-ray scattering to understand the effect of substrate heating. By increasing the substrate temperature from ambient to 110°C, it was found that no significant change was observed in the crystal size for the C60:TAPC concentrations studied in this research. In addition to the variation done in the substrate temperature, variation of the mole percent of the donor (TAPC) was studied to conclude the effect of both the substrate temperature and the donor concentration on the microstructure of the OSC films. Bragg peaks were attributed to C60 in the pure C60 sample and in the blend with low donor mole percentage (5%), but the C60 peaks became non-discernible when the donor mole percentage was increased to 50% and above, showing that TAPC interrupted the formation of C60 crystals.