Stress-induced indirect to direct band gap transition in β -FeSi2 nanocrystals embedded in Si

A. V. Shevlyagin, D. L. Goroshko, E. A. Chusovitin, S. A. Balagan, S. A. Dotsenko, K. N. Galkin, N. G. Galkin, T. S. Shamirzaev, A. K. Gutakovskii, M. Iinuma, Y. Terai

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

Embedded in silicon β-FeSi2 nanocrystals (NCs) were grown on Si(111) by solid phase epitaxy of a thin iron film followed by Si molecular beam epitaxy. After solid phase epitaxy, a mixture of β-FeSi2 and ϵ-FeSi nanocrystals is formed on the surface, sometimes β and ϵ phases coexist inside one nanocrystal. During initial stage of Si molecular beam epitaxy all ϵ-FeSi transforms into β-FeSi2. β-FeSi2 nanocrystals tend to move following Si growth front. By adjusting growth condition, we manage to prevent the nanocrystals from moving and to fabricate 7-layer n-Si(111)/β-FeSi2-NCs/p+-Si silicon heterostructure with embedded β-FeSi2 NCs. An epitaxial relationship and a stress induced in the nanocrystals by silicon matrix were found to be suitable for indirect to direct band gap transition in β-FeSi2. Of the heterostructure, a n-i-p avalanche photodetector and a light-emitting diode were formed. They have shown relatively good performance: ultrabroadband photoresponse from the visible (400 nm) to short-wavelength infrared (1800 nm) ranges owing to quantum-confined Stark effect in the nanocrystals and optical emission power of up to 25 μW at 9 A/cm2 with an external quantum efficiency of 0.009% at room temperature owing to a direct fundamental transition in stressed β-FeSi2 nanocrystals.

Original languageEnglish
Title of host publicationProceedings of International Conference on Metamaterials and Nanophotonics, METANANO 2017
PublisherAmerican Institute of Physics Inc.
Number of pages5
Volume1874
ISBN (Electronic)9780735415546
DOIs
Publication statusPublished - 14 Sep 2017
EventInternational Conference on Metamaterials and Nanophotonics, METANANO 2017 - Vladivostok, Russian Federation
Duration: 18 Sep 201722 Sep 2017

Publication series

NameAIP Conference Proceedings
PublisherAMER INST PHYSICS
Volume1874
ISSN (Print)0094-243X

Conference

ConferenceInternational Conference on Metamaterials and Nanophotonics, METANANO 2017
CountryRussian Federation
CityVladivostok
Period18.09.201722.09.2017

Keywords

  • SI(001)

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