Studies On Nanocomposites Of Zno And Conducting Polymer For Hybrid Solar Cell Application

Abstract

Materials for Hybrid solar cells based on green synthesized ZnO and environmental newlinestable Polypyrrole was studied systemically in this dissertation. The chemicals used to newlinesynthesize nanoparticles are toxic to human as well as to environment. So, a green newlinesynthetic approach was followed in this study in order to eliminate the noxious effect newlineof toxins to the society. All the synthesized materials are systemically characterized newlinefor its morphological, structural, Optical and electrical properties. newlinePolypyrrole(PPy) was chosen as P-type material as it is economically stable low newlinebandgap conjugated polymer. An eco-friendly friendly dopant was chosen for newlinePolpyrrole to enhance the optical and electrical property of the polymer. newlinePolypyrrole(PPy) and doped PPy thin film were synthesized by a facile Simple newlineSuccessive ionic layer adsorption and reaction (SILAR) method. Among various newlineorganic and inorganic acid dopants Sodium Iodide (NaI) doped PPy thin film newlineexhibited narrow band gap of 1.75eV and had excellent ability to absorb light in red newlineregion of the spectrum. NaI doped PPy thin film showed higher conductivity due to newlinecharge transfer mechanism. ZnO which is a n-type material was synthesized by using newlineeco-friendly solvent from cucum sativa fruit pulp which acts as reducing and masking newlineagent. In order to enhance the optical and electrical properties of ZnO, the newlinesemiconductor is doped with Aluminium and Manganese which have the similar ionic newlinesize of the host material. A reduction in band gap was observed for higher newlineconcentration of dopants. The bandgap of NaI doped PPy falls in the higher range of visible region, hence it was taken further to make nanocomposite thin film by dip coating method with spherical shape ZnO and doped ZnO nanoparticles. The photoluminescence intensity (Pl) of the nanocomposite thin film got reduced drastically suggesting a stronger interaction between semiconducting material and the polymer which may produce the better electrons holes separation efficiency in the nanocomposite. Further , Pulse laser depos