Photodetecting Heterostructures from Graphene and Encapsulated Colloidal Quantum Dot Films.
ACS Omega
; 4(14): 15824-15828, 2019 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-31592149
ABSTRACT
Heterostructure devices consisting of graphene and colloidal quantum dots (QDs) have been remarkably successful as photodetectors and have opened the door to technological applications based on the combination of these low-dimensional materials. This work explores the photodetection properties of a heterostructure consisting of a graphene field effect transistor covered by a film of silica-encapsulated colloidal QDs. Defects at the surface of the silica shell trap optically excited charge carriers, which simultaneously enables photodetection via two mechanisms photogating, resulting in a net p-doping of the device, and Coulombic scattering of charge carriers in the graphene, producing an overall decrease in the current magnitude.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
ACS Omega
Año:
2019
Tipo del documento:
Article
País de afiliación:
España