الفهرس 
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Abstract
A great increase in demand for low cost, high effect solar cell has intensified research into improving current technology and developing cutting-edge next generation photovoltaic devices. The fabrication of even the simplest semiconductor cell is a complex process that has to take place under tightly controlled conditions, and for this reason researchers have long considered organic alternatives. Organic semiconductors can often be made a flexible, lightweight and inexpensive form of solar cells. Thin films of nanocrystalline 3,4,9,10-perylene-tetracarboxylic-diimide were prepared on quartz substrates by thermal evaporation technique. The structural properties were identified by transmission electron microscopy (TEM) and the X-ray diffraction (XRD). The optical properties were investigated using spectrophotometric measurements. Organic–inorganic solar cell was also fabricated p-type Si substrates using the conventional thermal evaporation technique. Under illumination, the cell exhibits photovoltaic characteristics with an open circuit voltage (Voc) of 0.4 V, a short circuit current (Isc) of 1 mA, and a power conversion efficiency of 6%. These parameters have been estimated at room temperature and under illumination of 50 mW/cm2. Additionally the effect of different temperatures and illuminated powers on the performance of PTCDI/Si solar cell were illustrated and discussed.