Chemical bath deposited n-ZnO nanostructures on p-Si substrate for photo-detecting applications: Impact of annealing temperature

Abstract

In this current work, the zinc oxide (ZnO) nanostructures are grown by employing chemical bath deposition (CBD) method. The as grown samples are annealed at 400°C and 600°C for 30 min in argon environment. A comparative study has been performed to study the systematic change of nanostructure morphology, chemical composition, crystallite structure and photo-sensing effects due to thermal annealing of the CBD grown ZnO nanostructure. The 400°C annealed sample exhibit nanosphere structure with significant enhancement in photo responsivity under UV illumination of 13mW/cm2 at 365 nm. The present study suggests that the responsivity of the CBD grown ZnO nanostructure can be improved by thermal annealing at 400°C.