Fast and Efficient Photodetection in Nanoscale Quantum-Dot Junctions

被引：54

作者：

Prins, Ferry ^{[1
]}

Buscema, Michele ^{[1
]}

Seldenthuis, Johannes S. ^{[1
]}

Etaki, Samir ^{[1
]}

Buchs, Gilles ^{[1
]}

Barkelid, Maria ^{[1
]}

Zwiller, Val ^{[1
]}

Gao, Yunan ^{[1
,2
]}

Houtepen, Arjan J. ^{[2
]}

Siebbeles, Laurens D. A. ^{[2
]}

van der Zant, Herre S. J. ^{[1
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, NL-2600 GA Delft, Netherlands

[2] Delft Univ Technol, Dept Chem Engn, NL-2628 BL Delft, Netherlands

来源：

NANO LETTERS | 2012年 / 12卷 / 11期

关键词：

Colloidal quantum dots; nanogap electrodes; nanoscale photodetectors; photoconductive gain; ELECTRON; GENERATION; CONDUCTION; SOLIDS;

D O I：

10.1021/nl303008y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：5740 / 5743

页数：4

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