Structural and electronic characteristics of CdS – wurtzoid for tandem solar cells window: Experimental and simulation

Abstract

One of the most frequently asked questions in photovoltaics is about efficiencies. Wurtzite Cadmium sulfide (CdS) thin films have properties that are suitable for solar cell fabrication especially in tandem solar cells. According to the start point of nanostructure using in solar cells like tandem, we have gone to use the wurtzoid instead of wurtzite structure for CdS as a window in tandem solar cell. Simulation of nanostructure parameters of CdS in wurtzoid structure have been performed with Gaussian 09 program with its view. For simulation study; optimization of structure, total energy, energy gap, potential of ionization, electron affinity, work function, electronegativity, chemical potential (Fermi energy), electrophilicity, chemical hardness, softness, and amount of charge transport have been investigated. For experimental work CdS in wurtzoid structure as a window was produced by pulse laser deposition (PLO) onto perovskites thin films which are prepared by solution processing drop casting in tandem solar cell. The analysis provides: the fill factor and the power conversion efficiency. The energy gap of the CdS wurtzoid molecule is 3.190eV. The efficiency of tandem perovskite solar cell with CdS wurtzoid window was reached 22.3 %.One of the most frequently asked questions in photovoltaics is about efficiencies. Wurtzite Cadmium sulfide (CdS) thin films have properties that are suitable for solar cell fabrication especially in tandem solar cells. According to the start point of nanostructure using in solar cells like tandem, we have gone to use the wurtzoid instead of wurtzite structure for CdS as a window in tandem solar cell. Simulation of nanostructure parameters of CdS in wurtzoid structure have been performed with Gaussian 09 program with its view. For simulation study; optimization of structure, total energy, energy gap, potential of ionization, electron affinity, work function, electronegativity, chemical potential (Fermi energy), electrophilicity, chemical hardness, softness, and amount of charge transport have been investigated. For experimental work CdS in wurtzoid structure as a window was produced by pulse laser deposition (PLO) onto perovskites thin films which are prepared by solution processing drop casting in tandem...