Highly Dense ZnO Nanowires Grown on Graphene Foam for Ultraviolet Photodetection.
Growth of highly dense ZnO nanowires (ZnO NWs) is demonstrated on three-dimensional graphene foam (GF) using resistive thermal evaporation technique. Photoresponse of the as-grown hybrid structure of ZnO NWs on GF (ZnO NWs/GF) is evaluated for ultraviolet (UV) detection. Excellent photoresponse with fast response and recovery times of 9.5 and 38 s with external quantum efficiency of 2490.8% is demonstrated at low illumination power density of 1.3 mW/cm(2). In addition, due to excellent charge carrier transport, mobility of graphene reduces the recombination rate of photogenerated charge carriers, hence the lifetime of photogenerated free charge carriers enhances in the photodetectors.
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka, India 560012.
Buddha Deka
BD
Boruah
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka, India 560012.
Anwesha
A
Mukherjee
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka, India 560012.
S
S
Sridhar
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka, India 560012.
Abha
A
Misra
Zinc oxide; graphene foam; heterostructure; nanowire; photodetector