Study the With Different Precursor Molarities the Calculation the Urbach Energy in the Undoped ZnO Thin Films

Abstract

The ZnO thin films were prepared with different precursor molarities by ultrasonic spray method on glass substrate at 350 °C. This paper is to present a new approach to the description of correlation between Urbach energy and optical gap energy with precursor molaritie. This correlation based on experimental data of our study published previously in the international journal. The measurement of the Urbach energy of undoped ZnO thin films were realized at different model proposals; these measurements shows that the Urbach energy of the films can be estimated by varying the optical gap energy and the concentration of ZnO solution. The best estimated results are measured by Eq. (1) with minimum relative errors values were limited to 2 %. Thus results indicate that the ZnO thin films are chemically purer and have many fewer defects and less disorder owing to an almost complete chemical decomposition