Enhanced UV photoresponse with Au nanoparticles incorporated rGO/Si heterostructure

In this work, we demonstrated Au nanoparticles incorporated reduced graphene oxide (rGO)/Si heterostructure based UV photodetector. The pristine and Au nanoparticles incorporated heterostructure was analyzed and characterized by x-ray photo electron spectroscopy (XPS), Current- Voltage (I-V) characteristics and UV photo detective properties were examined by using UV light emitting diode (LED) with 382 nm wavelengths. The UV photoresponse properties revealed that the Au-rGO/Si heterostructure showed much better photoresponse activity toward UV light than pristine rGO/Si. The experimental results clearly revealed that the photoresponse of Au-rGO/Si heterostructure can be effectively enhanced by 30 times at 382 nm wavelength over pristine rGO/Si. The effect of rGO thickness on performance of UV photodetector was also examined. The improved photoresponse was attributed to localized surface plasmon resonance, in addition high electron transport capability of rGO number of photoexcited electrons collected at interface.