Graphene-based infrared sensors

Abstract

Graphene is a carbon-based, atomically thin, two-dimensional material that exhibits remarkable optical and electronic properties that have not been demonstrated by conventional bulk materials. In particular, its broadband photodetection capability, high carrier mobility, and low environmental impact are advantageous for infrared (IR) sensor applications. This paper discusses the prospects and challenges of graphene-based optical sensors. In addition, the photodetection mechanism of graphene-based optical sensors is explained. Subsequently, a promising optical-sensor performance-enhancing method of photogating is discussed. Finally, graphene-photogated diodes (GPDs), which exhibit high responsivity and low dark current, and graphene-based IR image sensors using an array format of such GPDs are reviewed.