Photodetecting Heterostructures from Graphene and Encapsulated Colloidal Quantum Dot Films

Black, Andrés and Urbanos, Fernando and Roberts, Jonathan and Acebron, Maria and Bernardo Gavito, Ramon and Juarez, Beatriz H. and Robinson, Benjamin and Young, Robert and Vazquez de Parga, Amadeo and Granados, Daniel (2019) Photodetecting Heterostructures from Graphene and Encapsulated Colloidal Quantum Dot Films. ACS Omega, 4 (14). pp. 15824-15828. ISSN 2470-1343

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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.

Item Type:
Journal Article
Journal or Publication Title:
ACS Omega
ID Code:
136759
Deposited By:
Deposited On:
23 Sep 2019 15:00
Refereed?:
Yes
Published?:
Published
Last Modified:
26 May 2020 08:15