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Proceedings Paper

A resonant tunneling CdSe quantum dot photodetector for spectral resolution in the visible region
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Paper Abstract

A spectrally resolving quantum dot photodetector has been designed and fabricated which is able to discriminate wavelengths in the visible region. The device consists of a monolayer of 5.4 nm diameter CdSe nanoparticles that have been sandwiched between two organic layers of Hexanedithiol, all on a highly doped p-type InP substrate. A thin, semitransparent layer of gold deposited on the top of the device made the second contact. The two layers of Hexanedithiol act as tunnel barriers for electrons inside the nanoparticles. Changing the bias voltage across the device, causes specific energy states inside the quantum dot to align with the conduction band edge of the InP. Any excited carriers in these energy levels will tunnel trough the organic barrier and be collected as photocurrent. By changing the wavelength of the incident light, the device shows a wavelength dependent I-V spectrum with jumps in the current at specific voltages. Comparing which peaks in different wavelengths are present, shows that the device has a spectrally dependent response to the incident light.

Paper Details

Date Published: 2 February 2007
PDF: 8 pages
Proc. SPIE 6479, Quantum Sensing and Nanophotonic Devices IV, 64790U (2 February 2007); doi: 10.1117/12.700376
Show Author Affiliations
Amir Dindar, Univ. of Massachusetts, Lowell (United States)
Joel Therrien, Univ. of Massachusetts, Lowell (United States)

Published in SPIE Proceedings Vol. 6479:
Quantum Sensing and Nanophotonic Devices IV
Manijeh Razeghi; Gail J. Brown, Editor(s)

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