Room temperature photocurrent spectroscopy of single zincblende and wurtzite InP nanowires

Simple photolithographic techniques are used to fabricate single InP nanowire devices with back-to-back Schottky barriers. Direct imaging of the photoresponse shows that the active regions of the device are spatially localized near the reverse-biased Schottky barrier. By tuning the laser excitation energy from below to well above the energy gap, photocurrent spectroscopy can illuminate the zincblende or wurtzite nature of the nanowire device even at room temperature.