Journal
NANO LETTERS
Volume 12, Issue 11, Pages 5740-5743Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl303008y
Keywords
Colloidal quantum dots; nanogap electrodes; nanoscale photodetectors; photoconductive gain
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Funding
- Stichting FOM under the program 86
- FOM projectruimte, through the FP7-framework program ELFOS
- Marie Curie Intra European Fellowship
- Stichting FOM under the program 111
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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.
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