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Field emission and photo-enhanced field emission investigations of CdS nanowires array

The CdS nanowires array were grown by thermal evaporation technique on Au patterned silicon substrate. The SEM and TEM are used to analyze surface morphology as well as crystallinity of the as-synthesized CdS nanowires film. The field emission properties of CdS nanowires array were investigated in a parallel plate diode configuration. A high current density of ∼ 68 µA/cm2 has been drawn at the applied electric field of ∼ 5.2 V/μm. The field emission current-time stability measurements depict that the emission current is stable over the period of measurement (3h). The photo-enhanced field emission study shows the photo-switching behavior with rise in the current level to ∼ 3μA for the preset value of ∼ 1μA repetitively.