Graphene Nanoribbon Quantum-Well Interband and Intersubband Photodetector

1-D quantum-well (QW) formation and energy state confinement in armchair graphene nanoribbon (A-GNR) heterostructures have been studied. A photodetector device structure based on A-GNR-QWs has been proposed to incorporate both interband and intersubband optical transition using a back-gate potential. Photocurrent, dark current, and quantum efficiency of different A-GNR-QW photodetector structures are studied using self-consistent simulation between nonequilibrium Green's function formalism including electron-photon interaction and Poisson's equation. Optical detection from short-wavelength infrared to ultraviolet range has been observed having a tunable feature, which makes our device a promising candidate for future optoelectronics.