Fast and efficient photodetection in nanoscale quantum-dot junctions

Ferry Prins; Michele Buscema; Johannes S. Seldenthuis; Samir Etaki; Gilles Buchs; Maria Barkelid; Val Zwiller; Yunan Gao; Arjan J. Houtepen; Laurens D.A. Siebbeles; Herre S.J. Van Der Zant

doi:10.1021/nl303008y

Fast and efficient photodetection in nanoscale quantum-dot junctions

Ferry Prins, Michele Buscema, Johannes S. Seldenthuis, Samir Etaki, Gilles Buchs, Maria Barkelid, Val Zwiller, Yunan Gao, Arjan J. Houtepen, Laurens D.A. Siebbeles, Herre S.J. Van Der Zant

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

We report on a photodetector in which colloidal quantum dots directly bridge nanometer-spaced electrodes. Unlike in conventional quantum-dot thin film photodetectors, charge mobility no longer plays a role in our quantum-dot junctions as charge extraction requires only two individual tunnel events. We find an efficient photoconductive gain mechanism with external quantum efficiencies of 38 electrons-per-photon in combination with response times faster than 300 ns. This compact device-architecture may open up new routes for improved photodetector performance in which efficiency and bandwidth do not go at the cost of one another.

Original language	English
Pages (from-to)	5740-5743
Number of pages	4
Journal	Nano Letters
Volume	12
Issue number	11
DOIs	https://doi.org/10.1021/nl303008y
State	Published - Nov 14 2012
Externally published	Yes

Keywords

Colloidal quantum dots
nanogap electrodes
nanoscale photodetectors
photoconductive gain

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10.1021/nl303008y

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title = "Fast and efficient photodetection in nanoscale quantum-dot junctions",

abstract = "We report on a photodetector in which colloidal quantum dots directly bridge nanometer-spaced electrodes. Unlike in conventional quantum-dot thin film photodetectors, charge mobility no longer plays a role in our quantum-dot junctions as charge extraction requires only two individual tunnel events. We find an efficient photoconductive gain mechanism with external quantum efficiencies of 38 electrons-per-photon in combination with response times faster than 300 ns. This compact device-architecture may open up new routes for improved photodetector performance in which efficiency and bandwidth do not go at the cost of one another.",

keywords = "Colloidal quantum dots, nanogap electrodes, nanoscale photodetectors, photoconductive gain",

author = "Ferry Prins and Michele Buscema and Seldenthuis, {Johannes S.} and Samir Etaki and Gilles Buchs and Maria Barkelid and Val Zwiller and Yunan Gao and Houtepen, {Arjan J.} and Siebbeles, {Laurens D.A.} and {Van Der Zant}, {Herre S.J.}",

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T1 - Fast and efficient photodetection in nanoscale quantum-dot junctions

AU - Prins, Ferry

AU - Buscema, Michele

AU - Seldenthuis, Johannes S.

AU - Etaki, Samir

AU - Buchs, Gilles

AU - Barkelid, Maria

AU - Zwiller, Val

AU - Gao, Yunan

AU - Houtepen, Arjan J.

AU - Siebbeles, Laurens D.A.

AU - Van Der Zant, Herre S.J.

PY - 2012/11/14

Y1 - 2012/11/14

N2 - We report on a photodetector in which colloidal quantum dots directly bridge nanometer-spaced electrodes. Unlike in conventional quantum-dot thin film photodetectors, charge mobility no longer plays a role in our quantum-dot junctions as charge extraction requires only two individual tunnel events. We find an efficient photoconductive gain mechanism with external quantum efficiencies of 38 electrons-per-photon in combination with response times faster than 300 ns. This compact device-architecture may open up new routes for improved photodetector performance in which efficiency and bandwidth do not go at the cost of one another.

AB - We report on a photodetector in which colloidal quantum dots directly bridge nanometer-spaced electrodes. Unlike in conventional quantum-dot thin film photodetectors, charge mobility no longer plays a role in our quantum-dot junctions as charge extraction requires only two individual tunnel events. We find an efficient photoconductive gain mechanism with external quantum efficiencies of 38 electrons-per-photon in combination with response times faster than 300 ns. This compact device-architecture may open up new routes for improved photodetector performance in which efficiency and bandwidth do not go at the cost of one another.

KW - Colloidal quantum dots

KW - nanogap electrodes

KW - nanoscale photodetectors

KW - photoconductive gain

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JO - Nano Letters

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Fast and efficient photodetection in nanoscale quantum-dot junctions

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Keywords

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