Growth and Measurement Of Sno: Zn2+ And Sno:Dye Extract from Green Leaves of Tectonagrandis Thin Films Deposited Using Spray Pyrolysis Techniques

Abstract

Dye-sensitized solar cell has a number of attractive features; it provides flexible solar modules, and can be fabricated using conventional method. Dye-sensitized Nanohybrid Zn_xSn_yO_z thin films were prepared on glass substrates using Master Airbrush Brand-model G25, G255-SET and G266-SET to deposit SnO, SnO: Zn²⁺ and SnO. The concentration of the dopant was varied from 0.1M – 0.5M of Zn²⁺ and 1% - 5% of dye-extract.  The effect of Zn²⁺ and dye ofTectonagrandison optical and structural properties of the films were examined and analysed. The result showed that the absorbance of the undoped SnO thin films at various substrate temperatures vary from 0.1–0.7. The dye doped samples showed an improvement in optical transmission at 625nm. The increase in transmittance could be attributed to the organic content of dye. Peak reflectance was observed at 350nm for un-doped and Zn²⁺ doped samples. The band gap energy of the dye doped sample is lower ranging from: 1.55 – 1.88eV than that of the Zn²⁺ doped samples, 1.60 – 2.22eV. The incorporation of the dyes shifted the fundamental absorption edge of the un-doped SnO thin films thus providing tuning effect of the band gap for solar cells application. The enormous growth of interest in solar energy is the consequence of the need to produce a cleaner energy that is inexpensive and less pollutant to the environment. The solar energy is the most abundant and environmentally friendly renewable energy resource. Photovoltaic’s offers an alternative means of producing essential electrical power without further endangering the delicate balance of our fragile ecosystems. It is the direct means of conversion of solar energy to electricity.