High Gain and Broadband Absorption Graphene Photodetector Decorated with Bi2Te3 Nanowires
Tae Jin Yoo, Wan Sik Kim, Kyoung Eun Chang, Cihyun Kim, Min Gyu Kwon, Ji Young Jo, Byoung Hun Lee
Abstract
A graphene photodetector decorated with Bi2Te3 nanowires (NWs) with a high gain of up to 3 × 104 and wide bandwidth window (400–2200 nm) has been demonstrated. The photoconductive gain was improved by two orders of magnitude compared to the gain of a photodetector using a graphene/Bi2Te3 nanoplate junction. Additionally, the position of photocurrent generation was investigated at the graphene/Bi2Te3 NWs junction. Eventually, with low bandgap Bi2Te3 NWs and a graphene junction, the photoresponsivity improved by 200% at 2200 nm (~0.09 mA/W).
Topics & Concepts
GraphenePhotodetectorMaterials sciencePhotocurrentOptoelectronicsNanowirePhotoconductivityAbsorption (acoustics)Band gapNanotechnologyComposite materialGraphene research and applicationsNanowire Synthesis and Applications2D Materials and Applications