Fast and Efficient Photodetection in Nanoscale Quantum-Dot Junctions

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....

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Veröffentlicht in:	Nano letters 2012-11, Vol.12 (11), p.5740-5743
Hauptverfasser:	Prins, Ferry, Buscema, Michele, Seldenthuis, Johannes S, Etaki, Samir, Buchs, Gilles, Barkelid, Maria, Zwiller, Val, Gao, Yunan, Houtepen, Arjan J, Siebbeles, Laurens D. A, van der Zant, Herre S. J
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Bridges (structures) Charge Colloids - chemistry Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Electrodes Electronics Electrons Exact sciences and technology Extraction Gain Light Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Materials science Microscopy, Confocal - methods Molecular electronics, nanoelectronics Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Nanostructure Nanotechnology - methods Optics and Photonics Photochemistry - methods Photodetectors Physics Quantum Dots Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Thin films Time Factors
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Beschreibung
Zusammenfassung:	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.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl303008y