Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements

We performed interferometric time-resolved simultaneous reflectance and transmittance measurements to investigate the carrier dynamics in pump-probe experiments on thin porous silicon membranes. The experimental data was analysed by using a method built on the Wentzel-Kramers-Brillouin approximation...

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Autores principales: He, Wei, Wu, Rihan, Yurkevich, Igor V., Canham, Leigh T., Kaplan, Andrey
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6249267/
https://www.ncbi.nlm.nih.gov/pubmed/30464311
http://dx.doi.org/10.1038/s41598-018-35210-z
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author He, Wei
Wu, Rihan
Yurkevich, Igor V.
Canham, Leigh T.
Kaplan, Andrey
author_facet He, Wei
Wu, Rihan
Yurkevich, Igor V.
Canham, Leigh T.
Kaplan, Andrey
author_sort He, Wei
collection PubMed
description We performed interferometric time-resolved simultaneous reflectance and transmittance measurements to investigate the carrier dynamics in pump-probe experiments on thin porous silicon membranes. The experimental data was analysed by using a method built on the Wentzel-Kramers-Brillouin approximation and the Drude model, allowing us to reconstruct the excited carriers’ non-uniform distribution in space and its evolution in time. The analysis revealed that the carrier dynamics in porous silicon, with ~50% porosity and native oxide chemistry, is governed by the Shockley-Read-Hall recombination process with a characteristic time constant of 375 picoseconds, whereas diffusion makes an insignificant contribution as it is suppressed by the high rate of scattering.
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spelling pubmed-62492672018-11-28 Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements He, Wei Wu, Rihan Yurkevich, Igor V. Canham, Leigh T. Kaplan, Andrey Sci Rep Article We performed interferometric time-resolved simultaneous reflectance and transmittance measurements to investigate the carrier dynamics in pump-probe experiments on thin porous silicon membranes. The experimental data was analysed by using a method built on the Wentzel-Kramers-Brillouin approximation and the Drude model, allowing us to reconstruct the excited carriers’ non-uniform distribution in space and its evolution in time. The analysis revealed that the carrier dynamics in porous silicon, with ~50% porosity and native oxide chemistry, is governed by the Shockley-Read-Hall recombination process with a characteristic time constant of 375 picoseconds, whereas diffusion makes an insignificant contribution as it is suppressed by the high rate of scattering. Nature Publishing Group UK 2018-11-21 /pmc/articles/PMC6249267/ /pubmed/30464311 http://dx.doi.org/10.1038/s41598-018-35210-z Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
He, Wei
Wu, Rihan
Yurkevich, Igor V.
Canham, Leigh T.
Kaplan, Andrey
Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
title Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
title_full Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
title_fullStr Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
title_full_unstemmed Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
title_short Reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
title_sort reconstructing charge-carrier dynamics in porous silicon membranes from time-resolved interferometric measurements
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6249267/
https://www.ncbi.nlm.nih.gov/pubmed/30464311
http://dx.doi.org/10.1038/s41598-018-35210-z
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