Band-gap engineering by molecular mechanical strain-induced giant tuning of the luminescence in colloidal amorphous porous silicon nanostructures

Handle URI:
http://hdl.handle.net/10754/563257
Title:
Band-gap engineering by molecular mechanical strain-induced giant tuning of the luminescence in colloidal amorphous porous silicon nanostructures
Authors:
Mughal, Asad Jahangir; El Demellawi, Jehad K.; Chaieb, Sahraoui ( 0000-0002-8053-3610 )
Abstract:
Nano-silicon is a nanostructured material in which quantum or spatial confinement is the origin of the material's luminescence. When nano-silicon is broken into colloidal crystalline nanoparticles, its luminescence can be tuned across the visible spectrum only when the sizes of the nanoparticles, which are obtained via painstaking filtration methods that are difficult to scale up because of low yield, vary. Bright and tunable colloidal amorphous porous silicon nanostructures have not yet been reported. In this letter, we report on a 100 nm modulation in the emission of freestanding colloidal amorphous porous silicon nanostructures via band-gap engineering. The mechanism responsible for this tunable modulation, which is independent of the size of the individual particles and their distribution, is the distortion of the molecular orbitals by a strained silicon-silicon bond angle. This mechanism is also responsible for the amorphous-to-crystalline transformation of silicon. This journal is
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Phys. Chem. Chem. Phys.
Issue Date:
2014
DOI:
10.1039/c4cp02966f
Type:
Article
ISSN:
14639076
Sponsors:
We would like to thank Qingxiao (Vincent) Wang for his help on the STEM and EELS and Dr Dalaver Anjum for acquiring the HRTEM images. We also thank King Abdullah University of Science and Technology (KAUST) for financial support.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorMughal, Asad Jahangiren
dc.contributor.authorEl Demellawi, Jehad K.en
dc.contributor.authorChaieb, Sahraouien
dc.date.accessioned2015-08-03T11:44:15Zen
dc.date.available2015-08-03T11:44:15Zen
dc.date.issued2014en
dc.identifier.issn14639076en
dc.identifier.doi10.1039/c4cp02966fen
dc.identifier.urihttp://hdl.handle.net/10754/563257en
dc.description.abstractNano-silicon is a nanostructured material in which quantum or spatial confinement is the origin of the material's luminescence. When nano-silicon is broken into colloidal crystalline nanoparticles, its luminescence can be tuned across the visible spectrum only when the sizes of the nanoparticles, which are obtained via painstaking filtration methods that are difficult to scale up because of low yield, vary. Bright and tunable colloidal amorphous porous silicon nanostructures have not yet been reported. In this letter, we report on a 100 nm modulation in the emission of freestanding colloidal amorphous porous silicon nanostructures via band-gap engineering. The mechanism responsible for this tunable modulation, which is independent of the size of the individual particles and their distribution, is the distortion of the molecular orbitals by a strained silicon-silicon bond angle. This mechanism is also responsible for the amorphous-to-crystalline transformation of silicon. This journal isen
dc.description.sponsorshipWe would like to thank Qingxiao (Vincent) Wang for his help on the STEM and EELS and Dr Dalaver Anjum for acquiring the HRTEM images. We also thank King Abdullah University of Science and Technology (KAUST) for financial support.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleBand-gap engineering by molecular mechanical strain-induced giant tuning of the luminescence in colloidal amorphous porous silicon nanostructuresen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.identifier.journalPhys. Chem. Chem. Phys.en
kaust.authorMughal, Asad Jahangiren
kaust.authorChaieb, Sahraouien
kaust.authorEl Demellawi, Jehad K.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.