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Fast and efficient photodetection in nanoscale quantum-dot junctions

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arxiv 1211.0456 v1 pith:WIIPOZX5 submitted 2012-11-02 cond-mat.mes-hall cond-mat.mtrl-sci

Ferry Prins , Michele Buscema , Johannes S. Seldenthuis , Samir Etaki , Gilles Buchs , Maria Barkelid , Val Zwiller , Yunan Gao
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Arjan J. Houtepen Laurens D. A. Siebbeles Herre S. J. van der Zant
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classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords quantum-dotchargeefficientjunctionsphotodetectoranotherbandwidthbridge
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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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