Facile assembly of n-SnO2 nanobelts–p-NiO heterojunctions with enhanced ultraviolet photoresponse†
Abstract
We present a highly transparent heterojunction photodiode by precisely aligning n-type SnO2 nanobelts on top of a p-type NiO thin film. This p–n junction diode demonstrates stable rectifying characteristics as well as greatly enhanced ultraviolet photoresponse, which exhibits an ultrahigh photosensitivity of up to 105 with accelerated response speed under reverse bias.