This work is devoted to see how the magnetic field flux affects the value of the energy gap of impurity (Fe) Light Dependent resistance (LDR). This effect is studied at different − wave lengths. The variation of the energy gap values with the − wavelengths is also studied. In this study the dependence of the energy gap on the magnetic field is discussed. We show that the gap width decreases with magnetic field approaching the critical value when a high voltage with minimum value is applied. The decrease in gap width value has been calculated for (5) Light Dependent Resistance (LDR) with different concentration( ). From the results, it’s clear that the impurity (Fe) light dependent resistance (LDR) is quite sensitive to the applied magnetic field. Also the results indicate that the energy gap in impurity (Fe) light dependent resistance depends not only on the magnetic field but also on the donor’s concentration, and the wave lengths of − . The result of this work should provide useful guidance for the optical absorption in semiconductors.
