Structural, optical and electrical characterizations of ZnO/PS

Abstract

This work reported on solar cell ZnO/PS heterojunction fabricated from Zinc nitrate with molar concentrations 0.05M and 0.2M using spray pyrolysis technique, to study the effect of high and low molar concentration of Zn precursor on structural, optical and electrical properties. The structural analyse showed that the obtained thin films deposited on glass substrate were polycrystalline with a hexagonal wurtzite structure and preferentially oriented along the c-axis direction, while structural properties enhanced with higher morality 0.2M. Roughness surface of ZnO/PS HJ increased widely with higher morality. Through I-V characteristics, the enhancement of electrical properties with higher molarity has been achieved. Isc get augment from 23mA/cm2, to 27mA/cm2, and Voc from 551mV to 554mV when molarity has taken values 0.05M and 0.2M respectively. Ideality factor has influenced by molarity variance too. The impact of solar irradiance G and temperature T on solar cell fabricated from 0.2M molarity has been investigated. The current density increased from 13.53 mA/cm2 to 27mA/cm2, the voltage from 525mV to 546mV, and the efficiency from 5.2% to 10.9% when the solar irradiance have increased from 500 to 1000W/m2. The temperature also influences on the solar cell behaviours, especially the voltage is enhanced by temperature increasing.