title: Effect of Magnetic Field on Photoresponse of Cobalt Integrated Zinc Oxide Nanorods.
abstract: Cobalt integrated zinc oxide nanorod (Co-ZnO NR) array is presented as a novel heterostructure for ultraviolet (UV) photodetector (PD). Defect states in Co-ZnO NRs surface induces an enhancement in photocurrent as compared to pristine ZnO NRs PD. Presented Co-ZnO NRs PD is highly sensitive to external magnetic field that demonstrated 185.7% enhancement in response current. It is concluded that the opposite polarizations of electron and holes in the presence of external magnetic field contribute to effective separation of electron-hole pairs that have drifted upon UV illumination. Moreover, Co-ZnO NRs PD shows a faster photodetection speed (1.2 s response time and 7.4 s recovery time) as compared to the pristine ZnO NRs where the response and recovery times are observed as 38 and 195 s, respectively.
authors.affiliation: Department of Instrumentation and Applied Physics, Indian Institute of Science , Bangalore, Karnataka, India 560012.
authors.forename: Buddha Deka
authors.initials: BD
authors.lastname: Boruah
authors.affiliation: Department of Instrumentation and Applied Physics, Indian Institute of Science , Bangalore, Karnataka, India 560012.
authors.forename: Abha
authors.initials: A
authors.lastname: Misra
keywords: cobalt; hybrid heterostructure; nanorods; photodetector; zinc oxide