Excitation of size selected nanocrystallites in porous silicon
- 18 May 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 72 (20) , 2556-2558
- https://doi.org/10.1063/1.121416
Abstract
We prepared silicon that exhibits green-to-red rainbow luminescence along the sample, reflecting gradients in the crystallite size. The excitation has a size-dependent feature, riding a smooth bulklike continuum. For the size-dependent contribution, we measured absorption band edges of 3.75 and 3.0–3.25 eV at the meniscus and opposite end. Excitation in the meniscus, monitored at the edge of the blue emission, isolates ultrasmall sizes, with “excitation coefficients” quadratic with energy, and emission encompassing much of the visible spectrum. Results are discussed in terms of quantum-confinement-induced restructuring of the diamondlike bonds to form radiative Si–Si surface states.Keywords
This publication has 12 references indexed in Scilit:
- Red to green rainbow photoluminescence from unoxidized silicon nanocrystallitesJournal of Applied Physics, 1998
- Photoexcitation of Si-Si surface states in nanocrystallitesPhysical Review B, 1997
- Ideal anodization of siliconApplied Physics Letters, 1997
- Electronic Structure of Amorphous Silicon NanoclustersPhysical Review Letters, 1997
- Porous Silicon: From Luminescence to LEDsPhysics Today, 1997
- Nature of Luminescent Surface States of Semiconductor NanocrystallitesPhysical Review Letters, 1996
- Behavior of porous silicon emission spectra during quenching by immersion in metal ion solutionsApplied Physics Letters, 1994
- Theoretical aspects of the luminescence of porous siliconPhysical Review B, 1993
- Intense photoluminescence from laterally anodized porous SiApplied Physics Letters, 1991
- Silicon quantum wire array fabrication by electrochemical and chemical dissolution of wafersApplied Physics Letters, 1990