Title :
Graphene Nanoribbon Quantum-Well Interband and Intersubband Photodetector
Author :
Saha, Atanu K. ; Saha, Gobinda ; Rashid, A.B.M.
Author_Institution :
Bangladesh Univ. of Eng. & Technol., Dhaka, Bangladesh
Abstract :
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.
Keywords :
Green´s function methods; Poisson equation; graphene devices; nanoribbons; photodetectors; quantum well devices; 1D QW formation; A-GNR heterostructure; A-GNR-QW; A-GNR-QW photodetector structures; Poisson equation; armchair graphene nanoribbon heterostructure; back-gate potential; dark current; electron-photon interaction; energy state confinement; graphene nanoribbon quantum-well interband photodetector; interband optical transition; intersubband optical transition; intersubband photodetector; nonequilibrium Green function formalism; optical detection; optoelectronics; photocurrent; photodetector device structure; quantum efficiency; self-consistent simulation; short-wavelength; ultraviolet range; Charge carrier processes; Graphene; Photoconductivity; Photodetectors; Photonic band gap; Quantum wells; Graphene nanoribbon (GNR); interband; intersubband; photodetector; quantum well (QW); quantum well (QW).;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2015.2493639
