Photoresponse of double-stacked graphene to Infrared radiation.
We report the photoresponse of stacked graphene layers towards infrared radiation. Graphene is stacked in two configurations, namely, crossed and parallel layers. Raman analysis demonstrated a strong interaction among the stacked graphene layers. Graphene in the crossed configuration exhibited the presence of both negative and positive conductivities; however, other configurations of graphene exhibited positive conductivity only. The presence of negative photoconductivity is proposed to be due to oxygen or oxygen-related functional group absorbents that are trapped in between two monolayers of graphene and act as scattering centers for free carriers. An interesting trend is reported in differential conductivity when stacked layers are compared with multilayers and parallel-stacked graphene layers.
Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka 560012, India. abha.misra1@gmail.com.
Prarthana
P
Gowda
Dipti R
DR
Mohapatra
Abha
A
Misra