Abstract:
The energy problem is one of the long standing problems facing civilization. This problem can be solved mainly using solar cells. Unfortunately, these cells suffer from their low efficiency. To solve this problem many solar cell thin films were fabricated. The aim of this work is to fabricate some solar thin films to study their optical and electrical properties using UV and FTIR spectrometers. Their Nano and crystal structure were studied using XRD technique. To do this five samples of Al2x Fe3(1-x)O4 and five samples of CuxFe1-x O2 were prepared with molar concentration indexes x (0.1, 0.3, 0.5,0.7, 0.9). The preparation technique is called Sol gel method. In this technique Al, Cu and Fe oxides were dissolved separately in distilled water in acidic medium separately. Then Al solution was mixed with Fe and Cu solution was mixed with Fe also separately. The samples are then dried in oven. The results of XRD shows increase of crystal Nano size upon decreasing Al and Cu molar concentrations. The results of UV indicate decrease of energy gap for all samples upon decreasing the Nano crystal size. The increase of Nano crystal size for Al increases the refractive index, optical and electrical conductivity beside the electric permittivity. However, for Cu the increase of the Nano crystal size decreases the refractive index, optical and electrical conductivity, beside the electric permittivity, while it causes the magnetic permeability to increase the FTIR results shows existence of many bonds that can absorb light and vibrate to give charge carriers more energies. This means that CuFe3O2 samples can give more efficient solar cells, since decreasing the Cu Nano size decreases the energy gap and increasing the conductivity in contrast to Al2xFe3(1-x)O4 samples in which the conductivity decreases.
