Effect of As flux on InAs submonolayer quantum dot formation for infrared photodetectors

A. Alzeidan (Corresponding author), T.F. Cantalice, K.D. Vallejo, R.S.R. Gajjela, A.L. Hendriks, P.J. Simmonds, P.M. Koenraad, A. A. Quivy

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Samenvatting

The performance of infrared photodetectors based on submonolayer quantum dots was investigated as a function of the arsenic flux. All the devices showed similar figures of merit and a very high specific detectivity above 1 × 1011 cm Hz1/2/W at 12 K, despite the fact that cross-sectional scanning tunneling microscopy images pointed out a strong reduction in the density of such nanostructures with decreasing arsenic flux. This contrast is a consequence of the small size and low In content of the submonolayer quantum dots that lead to a strong delocalization of the electrons wave function and, therefore, reduce the advantage of samples having a very high density of quantum dots. A simple strain model showed that the properties of these nanostructures are limited by the lack of vertical alignment of the small two-dimensional InAs islands resulting from the strong segregation of In atoms. We have proposed some ways to improve the growth of submonolayer quantum dots and believe that, after further optimization, such nanostructures might provide devices with superior performance.

Originele taal-2Engels
Artikelnummer113357
Aantal pagina's8
TijdschriftSensors and Actuators, A: Physical
Volume334
DOI's
StatusGepubliceerd - 1 feb. 2022

Bibliografische nota

Funding Information:
This study was financed in part by the Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - Brasil (CAPES) - Finance Code 001, by CNPq (grant 311687/2017-2), and by European Union's Horizon 2020 research and innovation program under the Marie Sk?odowska-Curie project 4PHOTON grant agreement No 721394.

Funding Information:
Kevin Vallejo is a Ph.D. student at Boise State University scheduled to graduate in the Fall of 2021. He obtained a Bachelor of Science degree from The University of Texas at El Paso in 2016, and a Master´s degree in Engineering from Boise State University in 2020. During the Spring 2015 semester, Kevin received the US Department of State Benjamin A. Gilman scholarship to study at Åbo Akademi University in Finland. In 2019, he received the US National Nuclear Science Foundation Graduate Fellowship, the US Intelligence Community Postdoctoral Fellowship, and Dean's Scholar award from Boise State University for outstanding scholarship.

Funding Information:
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil ( CAPES ) - Finance Code 001 , by CNPq (grant 311687/2017-2 ), and by European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie project 4PHOTON grant agreement No 721394 .

Publisher Copyright:
© 2021 Elsevier B.V.

Financiering

Kevin Vallejo is a Ph.D. student at Boise State University scheduled to graduate in the Fall of 2021. He obtained a Bachelor of Science degree from The University of Texas at El Paso in 2016, and a Master´s degree in Engineering from Boise State University in 2020. During the Spring 2015 semester, Kevin received the US Department of State Benjamin A. Gilman scholarship to study at Åbo Akademi University in Finland. In 2019, he received the US National Nuclear Science Foundation Graduate Fellowship, the US Intelligence Community Postdoctoral Fellowship, and Dean's Scholar award from Boise State University for outstanding scholarship. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil ( CAPES ) - Finance Code 001 , by CNPq (grant 311687/2017-2 ), and by European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie project 4PHOTON grant agreement No 721394 . This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001, by CNPq (grant 311687/2017-2), and by European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie project 4PHOTON grant agreement No 721394.

FinanciersFinanciernummer
US Intelligence Community Postdoctoral Fellowship
US National Nuclear Science Foundation
Boise State University
European Union’s Horizon Europe research and innovation programme
H2020 Marie Skłodowska-Curie Actions721394
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Conselho Nacional de Desenvolvimento Científico e Tecnológico311687/2017-2
Horizon 2020

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