METHOD FOR SYNTHESIS OF ZINC OXYSULPHIDE ALLOYS NANOCRYSTALS AND COMPOSITION INDUCED ANOMALOUS BAND GAP ENGINEERING FOR OPTOELECTRONIC DEVICES

摘要

This invention claims to be a fast and facile method for the synthesis of nearly monodisperse Zinc oxysulfide alloy nanocrystals with zinc blende (ZB) phase. This chemically formulated solution-combustion method is acclaimed for the first time with cost-effective  potentially safe chemicals having no environmental consequences and without using catalyst. An anomalous band gap bowing with modulation in band gap from 3.93 eV to 3.74 eV was observed with least band gap of 2.7 eV. Such large band gap off-sets between their most cited binary ZnO and ZnS components has made it feasible for their band gap based applications. Theoretical observations have strongly supported its experimental findings and supported the thermodynamic solubility factor for these alloys (30%). Tunable visible range emissions with manifold escalation in emission intensity ascertain it as a potential material for optoelectronic and solar cell applications due to its large band gap offsets.