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Effect of heteroepitaxial growth on LT-GaAs: ultrafast optical properties
dc.contributor.author | Afalla, Jessica | |
dc.contributor.author | Prieto, Elizabeth Ann | |
dc.contributor.author | Husay, Horace Andrew | |
dc.contributor.author | Gonzales, Cedric | |
dc.contributor.author | Catindig, Gerald | |
dc.contributor.author | Abulikemu, Aizitiaili | |
dc.contributor.author | Somintac, Armando | |
dc.contributor.author | Salvador, Arnel | |
dc.contributor.author | Estacio, Elmer | |
dc.contributor.author | Tan, Masahiko | |
dc.contributor.author | Hase, Muneaki | |
dc.date.accessioned | 2022-02-14T13:33:34Z | |
dc.date.available | 2022-02-14T13:33:34Z | |
dc.date.issued | 2021-06-16 | |
dc.identifier.citation | AFALLA, Jessica, et al. Effect of heteroepitaxial growth on LT-GaAs: ultrafast optical properties. Journal of Physics: Condensed Matter, 2021, vol. 33, no 31, p. 315704. | ca_CA |
dc.identifier.issn | 0953-8984 | |
dc.identifier.issn | 1361-648X | |
dc.identifier.uri | http://hdl.handle.net/10234/196749 | |
dc.description.abstract | Epitaxial low temperature grown GaAs (LT-GaAs) on silicon (LT-GaAs/Si) has the potential for terahertz (THz) photoconductive antenna applications. However, crystalline, optical and electrical properties of heteroepitaxial grown LT-GaAs/Si can be very different from those grown on semi-insulating GaAs substrates ('reference'). In this study, we investigate optical properties of an epitaxial grown LT-GaAs/Si sample, compared to a reference grown under the same substrate temperature, and with the same layer thickness. Anti-phase domains and some crystal misorientation are present in the LT-GaAs/Si. From coherent phonon spectroscopy, the intrinsic carrier densities are estimated to be 1015 cm−3 for either sample. Strong plasmon damping is also observed. Carrier dynamics, measured by time-resolved THz spectroscopy at high excitation fluence, reveals markedly different responses between samples. Below saturation, both samples exhibit the desired fast response. Under optical fluences ⩾54 μJ cm−2, the reference LT-GaAs layer shows saturation of electron trapping states leading to non-exponential behavior, but the LT-GaAs/Si maintains a double exponential decay. The difference is attributed to the formation of As–As and Ga–Ga bonds during the heteroepitaxial growth of LT-GaAs/Si, effectively leading to a much lower density of As-related electron traps. | ca_CA |
dc.format.extent | 8 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | IOP Publishing | ca_CA |
dc.relation.isPartOf | Jessica Afalla et al 2021 J. Phys.: Condens. Matter 33 315704 | ca_CA |
dc.relation.uri | https://doi.org/10.1088/1361-648X/ac04cc | ca_CA |
dc.rights | © 2021 IOP Publishing Ltd Printed in the UK | ca_CA |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | ca_CA |
dc.subject | heteroepitaxy | ca_CA |
dc.subject | low temperature growth | ca_CA |
dc.subject | GaAs | ca_CA |
dc.subject | terahertz | ca_CA |
dc.subject | coherent phonon | ca_CA |
dc.title | Effect of heteroepitaxial growth on LT-GaAs: ultrafast optical properties | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | https://doi.org/10.1088/1361-648X/ac04cc | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_CA |
dc.type.version | info:eu-repo/semantics/acceptedVersion | ca_CA |
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