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A novel and simple two-step preparation method has been successfully developed to synthesize high quality oxychalcogenide LaCuOS, a direct-gap p-type transparent semiconductor. We first successfully synthesized CuLaO2 using cheap Cu2O and La2O3 via solid state reaction, and then achieved high quality LaCuOS through sulfurization at an optimum temperature of 860°C without using conventional hazardous...
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