Photo-induced charge transport in ZnS nanocrystals decorated single walled carbon nanotube field-effect transistor

We describe a photoresponse measurement study on a pyrene linked ZnS nanoparticles decorated single walled carbon nanotube (SWNT) field-effect transistor (FET). We observed that the photocurrent response in the system is based on the semiconducting property of the SWNT. It was found that both the organic molecule linker, pyrene, together with ZnS nanocrystals contributed to the total photoresponse of the ZnS-pyrene/SWNT hybrid device. We demonstrated by FET characteristic studies that the majority charge carriers in the ZnS-pyrene/SWNT device upon UV illumination are positively charged photo-induced holes near the p-type SWNT channel.