Abstract:
In this research 7on polymer solar cells Were fabricated to determine their efficiency and energy gaps The polymer was deposited solution on the ITO glass was are deposited with concentration of ITO , and deposited another layer of dye concentration was are deposited with concentration of ITO , 3 mg in 1 mL of ethanol and making the electrode is made from silver “anode” ,ITO glass represent the “cathode” . The area of all cells equal 0.26 cm2. Absorbance was measured dye for (Rohdamin B, Coumarin 500, Lawsonia ,Blue 8GX , Roselle, DDTTC and Ero-Chrom black T ) and polymer (MEH-PPV) with UV-Ultra violet device were found Spectra the energy gaps and levels were determined .The relation between current and voltage was displayed also and the fill factor and efficiency of cells. . Based on transmittance and photoluminescence., the composition and the morphology of the samples were investigated using the X-ray diffraction analysis and field emission scanning electron microscopy.
The energy Levels and energy gaps for Semiconductors, doner. And acceptors In polymer Solar Cells Were found four polymer doped with Coumarin, Lawsonia, Rohdamin B, Blue 8GX, Roselle, DDTTC and Ero-Chrom black, by means of the values of absorption and transmission spectra, beside values of absorption coefficient- intensity relations of them. The results obtained for shows that the absorption spectra which relates intensity and emitted wave lengths for them gives the values of donor and acceptor levels which are 5.07 , 4.41 , 5.08 5.12 4.57 4.88 5.54 respectively 2.43 2.25 2.45 2.84 2.32 , 2.41 2.33 respectively. The transmission spectra for Coumarin, Lawsonia, Rohdamin B, Blue 8GX, Roselle, DDTTC and Ero-Chrom black is closely related to their energy gaps which were found to be these values are in conformity with the results obtained by the absorption coefficient - intensity relations which predicts the energy gaps , and which are in agreement with the standard values .The efficiencies of these cells , were found to be Strongly dependent on the width of energy gaps and energy gaps and energy Levels Locations
