Photoelectric Properties of InAs/GaAs Quantum Dot Photoconductive Antenna Wafers


In this paper, the study of the photoconductivity in self-assembled InAs/GaAs quantum dot photoconductive antenna in the wavelength region between 1140 nm and 1250 nm at temperatures ranging from 13 to 400 K is reported. These antennas are aimed to work in conjunction with quantum dot semiconductor lasers to effectively generate pulsed and continuous wave terahertz radiation. For the efficient operation, laser wavelengths providing the highest photocurrent should be determined. To study the interband photoconductivity of quantum dot photoconductive antennas, at room and cryogenic temperatures, we employed a broadly-tunable InAs/GaAs quantum dot based laser providing a coherent pump with power exceeding 20 mW over a 100 nm tunability range. The quantum dot antenna structure revealed sharp temperature-dependent photoconductivity peaks in the vicinity of wavelengths, corresponding to the ground and excited states of InAs/GaAs quantum dots. The ground state photoconductivity peak vanishes with a temperature drop, whereas the excited state peak persists. We associate this effect with different mechanisms of photoexcited carriers extraction from quantum dots.

Publication DOI:
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Funding: EU FP7-ICT FAST-DOT; EU FP7-ICT NEXPRESSO program; 10.13039/501100000266-EPSRC.
Uncontrolled Keywords: photoconductivity,Quantum dots,semiconductors,Ceramics and Composites,Materials Chemistry
Publication ISSN: 0792-1233
Last Modified: 27 Jun 2024 09:17
Date Deposited: 30 Oct 2017 08:21
Full Text Link: http://eprints. ...
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2018-03
Published Online Date: 2017-04-04
Accepted Date: 2017-03-29
Authors: Gorodetsky, Andrei (ORCID Profile 0000-0001-5440-2185)
Yadav, Amit (ORCID Profile 0000-0001-7865-6905)
Avrutin, Eugene
Fedorova, Ksenia A. (ORCID Profile 0000-0002-2765-9951)
Rafailov, Edik U. (ORCID Profile 0000-0002-4152-0120)



Version: Accepted Version

| Preview

Export / Share Citation


Additional statistics for this record