Long-wave bilayer graphene/HgCdTe based GBp type-II superlattice unipolar barrier infrared detector

• DOI: 10.1016/j.rio.2023.100425
• Publication Date: 2023-04-10T15:57:05Z
• Authors: Shonak Bansal
• Keywords: Infrared detector; Bilayer graphene

Type-II superlattice (T2SL) material is used to design highly efficient next-generation infrared (IR) detectors. The flexibility of the allows integration unipolar barrier IR detector architecture suppress generation-recombination currents by blocking majority charge carriers and improve device performance. This paper presents a self-powered T2SL that operates in long-wave regime. It comprises contact layer made p+-bilayer graphene (G) p–-Hg1–xCdx=0.41Te (B) placed over p+-Hg1–xCdx=0.2217Te absorber (p) known as GBp detector. optoelectronic characterization carried out using Silvaco Atlas TCAD software. Under mode operation, proposed exhibits an improvement photocurrent density about 108 times. dark current 0.4nA/cm2, responsivity 7.82 A/W, quantum efficiency 91.44%, detectivity 4.48 × 1014 cmHZ1/2/W are found at liquid nitrogen temperature with bias –0.5 V. A dichroic ratio 249 response time less than 1 ps likewise exhibited substantial electric field contact/barrier heterointerface high height conduction band, which result increased photodetection response, attributed this improved