Enhanced excitonic emission efficiency in porous GaN

Abstract We investigate the optical properties of porous GaN films of different porosities, focusing on the behaviors of the excitonic features in time-integrated and time-resolved photoluminescence. A substantial enhancement of both excitonic emission intensity and recombination rate, along with in...

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Autores principales:	Thi Huong Ngo, Bernard Gil, Tatiana V. Shubina, Benjamin Damilano, Stéphane Vezian, Pierre Valvin, Jean Massies
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Exciton Emission Light Extraction Efficiency Nonradiative Recombination Channels Metasurface Enhanced Recombination Rate Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6fb6501d0db34b0280442a5978ce5f1d
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spelling	oai:doaj.org-article:6fb6501d0db34b0280442a5978ce5f1d2021-12-02T15:08:36ZEnhanced excitonic emission efficiency in porous GaN10.1038/s41598-018-34185-12045-2322https://doaj.org/article/6fb6501d0db34b0280442a5978ce5f1d2018-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-34185-1https://doaj.org/toc/2045-2322Abstract We investigate the optical properties of porous GaN films of different porosities, focusing on the behaviors of the excitonic features in time-integrated and time-resolved photoluminescence. A substantial enhancement of both excitonic emission intensity and recombination rate, along with insignificant intensity weakening under temperature rise, is observed in the porous GaN films. These observations are in line with (i) the local concentration of electric field at GaN nanoparticles and pores due to the depolarization effect, (ii) the efficient light extraction from the nanoparticles. Besides, the porosification enlarges the surface of the air/semiconductor interface, which further promotes the extraction efficiency and suppresses non-radiative recombination channels. Our findings open a way to increasing the emission efficiency of nanophotonic devices based on porous GaN.Thi Huong NgoBernard GilTatiana V. ShubinaBenjamin DamilanoStéphane VezianPierre ValvinJean MassiesNature PortfolioarticleExciton EmissionLight Extraction EfficiencyNonradiative Recombination ChannelsMetasurfaceEnhanced Recombination RateMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Exciton Emission Light Extraction Efficiency Nonradiative Recombination Channels Metasurface Enhanced Recombination Rate Medicine R Science Q
spellingShingle	Exciton Emission Light Extraction Efficiency Nonradiative Recombination Channels Metasurface Enhanced Recombination Rate Medicine R Science Q Thi Huong Ngo Bernard Gil Tatiana V. Shubina Benjamin Damilano Stéphane Vezian Pierre Valvin Jean Massies Enhanced excitonic emission efficiency in porous GaN
description	Abstract We investigate the optical properties of porous GaN films of different porosities, focusing on the behaviors of the excitonic features in time-integrated and time-resolved photoluminescence. A substantial enhancement of both excitonic emission intensity and recombination rate, along with insignificant intensity weakening under temperature rise, is observed in the porous GaN films. These observations are in line with (i) the local concentration of electric field at GaN nanoparticles and pores due to the depolarization effect, (ii) the efficient light extraction from the nanoparticles. Besides, the porosification enlarges the surface of the air/semiconductor interface, which further promotes the extraction efficiency and suppresses non-radiative recombination channels. Our findings open a way to increasing the emission efficiency of nanophotonic devices based on porous GaN.
format	article
author	Thi Huong Ngo Bernard Gil Tatiana V. Shubina Benjamin Damilano Stéphane Vezian Pierre Valvin Jean Massies
author_facet	Thi Huong Ngo Bernard Gil Tatiana V. Shubina Benjamin Damilano Stéphane Vezian Pierre Valvin Jean Massies
author_sort	Thi Huong Ngo
title	Enhanced excitonic emission efficiency in porous GaN
title_short	Enhanced excitonic emission efficiency in porous GaN
title_full	Enhanced excitonic emission efficiency in porous GaN
title_fullStr	Enhanced excitonic emission efficiency in porous GaN
title_full_unstemmed	Enhanced excitonic emission efficiency in porous GaN
title_sort	enhanced excitonic emission efficiency in porous gan
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/6fb6501d0db34b0280442a5978ce5f1d
work_keys_str_mv	AT thihuongngo enhancedexcitonicemissionefficiencyinporousgan AT bernardgil enhancedexcitonicemissionefficiencyinporousgan AT tatianavshubina enhancedexcitonicemissionefficiencyinporousgan AT benjamindamilano enhancedexcitonicemissionefficiencyinporousgan AT stephanevezian enhancedexcitonicemissionefficiencyinporousgan AT pierrevalvin enhancedexcitonicemissionefficiencyinporousgan AT jeanmassies enhancedexcitonicemissionefficiencyinporousgan
_version_	1718388064959594496

Enhanced excitonic emission efficiency in porous GaN

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