Hybrid graphene-quantum dot phototransistors with ultrahigh gain.

By Gerasimos Konstantatos, M. Badioli, L. Gaudreau, J. Osmond, M. Bernechea, P. G. D. Arquer, F. Gatti, F H L Koppens. Nature Nanotechnology, 2011

2,131 citations recorded by the source corpus.

Graphene is an attractive material for optoelectronics and photodetection applications because it offers a broad spectral bandwidth and fast response times. However, weak light absorption and the absence of a gain mechanism that can generate multiple charge carriers from one incident photon have limited the responsivity of graphene-based photodetectors to ∼10(-2) A W(-1). Here, we demonstrate a gain of ∼10(8) electrons per photon and a responsivity of ∼10(7) A W(-1) in a hybrid photodetector that consists of monolayer or bilayer graphene covered with a thin film of colloidal quantum dots. Strong and tunable light absorption in the quantum-dot layer creates electric charges that are transferred to the graphene, where they recirculate many times due to the high charge mobility of graphene and long trapped-charge lifetimes in the quantum-dot layer. The device, with a specific detectivity of 7 × 10(13) Jones, benefits from gate-tunable sensitivity and speed, spectral selectivity from the short-wavelength infrared to the visible, and compatibility with current circuit technologies.

Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/e822e81b531bb211747529540ec27d0b3df06fd1

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

In Biomedical Engineering

In Materials Chemistry

Citations in the corpus

Few-Layer MoS2 with high broadband Photogain and fast optical switching for use in harsh environments. (2013, methodology): “org 3906 photogating effect, which is not achievable for pristine graphene.(17) Atomic layered molybdenum disulfide (MoS2), a newly emerging 2D nanomaterial with a direct and finite band gap, may provide a possible solution to surpass the shortages belonging to graphene.”