Wideband luminescence from bandgap-matched Mg-based Si core-shell geometry nanocomposite

We use wet treatment to integrate red-luminescent Si nanoparticles with Mg-based wide-bandgap insulators Mg(OH) and MgO (5.7 and 7.3 eV respectively). In the process, Mg2+ is reduced on Si nanoparticle clusters, while suffering combustion in water, producing a spatially inhomogeneous Mg(OH)2/MgO-Si...

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Bibliographic Details
Published inAIP advances Vol. 8; no. 5; pp. 055324 - 055324-11
Main Authors Kocyigit, Adem, Elhalawany, Noha, Bahceci, Ersin, Enders, Brian, Puthalath, Krithik, Abuhassan, Laila, Yamani, Zain, Nayfeh, Munir
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.05.2018
AIP Publishing LLC
Subjects
Broadband
Energy gap
Insulators
Luminescence
Magnesium oxide
Nanocomposites
Nanoparticles
Photonic band gaps
Photonics
Silicon
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Summary:We use wet treatment to integrate red-luminescent Si nanoparticles with Mg-based wide-bandgap insulators Mg(OH) and MgO (5.7 and 7.3 eV respectively). In the process, Mg2+ is reduced on Si nanoparticle clusters, while suffering combustion in water, producing a spatially inhomogeneous Mg(OH)2/MgO-Si nanoparticle composite with an inner material predominantly made of Si, and a coating consisting predominantly of magnesium and oxygen (“core-shell” geometry). The nanocomposite exhibit luminescence covering nearly entire visible range. Results are consistent with formation of Mg(OH)2/MgO phase with direct 3.43-eV bandgap matching that of Si, with in-gap blue-green emitting states of charged Mg and O vacancies. Bandgap match with nanocomposite architecture affords strong enough coupling for the materials to nearly act as a single hybrid material with novel luminescence for photonic and photovoltaic applications.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5019167