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
TL;DR
This paper introduces a nanoscale quantum-dot junction photodetector that achieves high efficiency and fast response times by leveraging a unique charge extraction mechanism, potentially advancing photodetector technology.
Contribution
It presents a novel quantum-dot junction design that bypasses charge mobility limitations, enabling high efficiency and rapid response in photodetectors.
Findings
External quantum efficiency of 38 electrons-per-photon
Response time faster than 300 nanoseconds
Charge extraction via two tunnel events
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.
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