On the origin of photoluminescence in silicon nanocrystals: Pressure-dependent structural and optical studies

Daniel C. Hannah; Jihua Yang; Paul Podsiadlo; Maria K Y Chan; Arnaud Demortière; David J. Gosztola; Vitali B. Prakapenka; George C. Schatz; Uwe Kortshagen; Richard D. Schaller

doi:10.1021/nl301787g

On the origin of photoluminescence in silicon nanocrystals: Pressure-dependent structural and optical studies

Daniel C. Hannah, Jihua Yang, Paul Podsiadlo, Maria K Y Chan, Arnaud Demortière, David J. Gosztola, Vitali B. Prakapenka, George C. Schatz, Uwe Kortshagen, Richard D. Schaller

Mechanical Engineering

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132 Scopus citations

Abstract

A lack of consensus persists regarding the origin of photoluminescence in silicon nanocrystals. Here we report pressure-dependences of X-ray diffraction and photoluminescence from alkane-terminated colloidal particles. We determine the diamond-phase bulk modulus, observe multiple phase transitions, and importantly find a systematic photoluminescence red shift that matches the X _conduction-to-Λ _valence transition of bulk crystalline silicon. These results, reinforced by calculations, suggest that the efficient photoluminescence, frequently attributed to defects, arises instead from core-states that remain highly indirect despite quantum confinement.

Original language	English (US)
Pages (from-to)	4200-4205
Number of pages	6
Journal	Nano letters
Volume	12
Issue number	8
DOIs	https://doi.org/10.1021/nl301787g
State	Published - Aug 8 2012

Keywords

Quantum dot
X-ray diffraction
diamond anvil cell
nanocrystal
photoluminescence
pressure
silicon

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AU - Demortière, Arnaud

AU - Gosztola, David J.

AU - Prakapenka, Vitali B.

AU - Schatz, George C.

AU - Kortshagen, Uwe

AU - Schaller, Richard D.

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On the origin of photoluminescence in silicon nanocrystals: Pressure-dependent structural and optical studies

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