Abstract:
Gum Arabic doped with CuO based Dye Sensitized Solar Cells (DSSC) with five type of dye (Coumarin 500, Ecrchrom Black, Rhodamin B, DDTTCI and Nile blue) were fabricated on ITO glass and silver.5 additional samples were prepared also by exchanging gum and dye layers. Microstructure and cell performance of the solar cells with (ITO/Gumّ Arabic+CuO/dye/ITO+ graphite and Iodine) structures were investigated. Photovoltaic devices based on the Gum Arabic/dye hetrojunction structures provided photovoltaic properties under illumination. Absorption and energy gap measurement of the (Coumarin 500, Ecrchrom Black Rhodamin B, DDTTCI and Nile blue), were studied by using UV-VS mini 1240 spectrophotometer and light current-voltage characteristics. The five (ITO/Gum Arabic/dye/ITO+ graphite) solar cells were produced and characterized, which provided efficiency (η) and Energy gap are 4.92 % for Eg = 1.436 eV, 1.9 % for Eg = eV, 2.01, 0.44 % for Eg = 2.641 eV and 0.37 % for Eg = 4.197 it is very interesting to note that the efficiency increasy as the energy gap decreases, which agrees with and previous studies. However for Ecrchrom Black the efficiency is high for transparency.ّWhen the gum layer is replaced by dye layer the efficiencies for the samples gum/ Coumarin 500, gum/ DDTTCI, gum/Ecrchrom Black, gum/Rhodamin B, and gum/ Nile blue are 0.38, 5,15, 0.44, 1.9 and 3.29 respectively. This shows that in most cases the efficiency of the solar cells in which gum layer is above the dye is higher this may be attributed to the fact that the gum is more transparent than these dyes except Ecrchrom Black dye. For Ecrchrom Black the results are different. It was observed that its efficiency (0.44) is more than that of coumarin 500 (0.37) although its energy gap is (4.197 eV) is more than that of coumarin 500 (2.641 eV) this may be attributed to the fact that Ecrchrom Black, is more transparent than coumarin 500. Fortunate when gum is replaced by Ecrchrom Black to make Ecrchrom Black above gum the efficiency increase which means that Ecrchrom Black in more transparent than gum. This allows more photons is incident on gum layers this liberate more photons.
