Size-dependent intrinsic radiative decay rates of silicon nanocrystals at large confinement energies

被引：137

作者：

Sykora, Milan ^{[1
]}

Mangolini, Lorenzo ^{[2
]}

Schaller, Richard D. ^{[1
]}

Kortshagen, Uwe ^{[2
]}

Jurbergs, David ^{[3
]}

Klimov, Victor I. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA

[2] Univ Minnesota, Dept Mech Engn, High Temperature & Plasma Lab, Minneapolis, MN 55444 USA

[3] Innovalight Inc, Santa Clara, CA 95054 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.100.067401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study ultrafast photoluminescence (PL) dynamics of Si nanocrystals (NCs). The early-time PL spectra (< 1 ns), which show strong dependence on NC size, are attributed to emission involving NC quantized states. The PL spectra recorded for long delays (> 10 ns) are almost independent of NC size and are likely due to surface-related recombination. Based on instantaneous PL intensities measured 2 ps after excitation, we determine intrinsic radiative rate constants for NCs of different sizes. These constants sharply increase for confinement energies greater than similar to 1 eV indicating a fast, exponential growth of the oscillator strength of zero-phonon, pseudodirect transitions.

引用

页数：4

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