Electronic Structure and Exciton-Phonon Interaction in Two-Dimensional Colloidal CdSe Nanosheets

被引：230

作者：

Achtstein, Alexander W. ^{[1
]}

Schliwa, Andrei ^{[2
]}

Prudnikau, Anatol ^{[3
]}

Hardzei, Marya ^{[3
]}

Artemyev, Mikhail V. ^{[3
]}

Thomsen, Christian ^{[2
]}

Woggon, Ulrike ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Opt & Atom Phys, D-10623 Berlin, Germany

[2] Tech Univ Berlin, Inst Solid State Phys, D-10623 Berlin, Germany

[3] Belarusian State Univ, Inst Physicochem Problems, Minsk 220080, BELARUS

来源：

NANO LETTERS | 2012年 / 12卷 / 06期

关键词：

Colloidal platelets; colloidal quantum well; electronic structure; exciton phonon coupling; zinc-blende CdSe; INTERBAND CRITICAL-POINTS; TEMPERATURE-DEPENDENCE; QUANTUM DOTS; PHOTOLUMINESCENCE; NANOCRYSTALS; GROWTH;

D O I：

10.1021/nl301071n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We study the electronic structure of ultrathin zinc-blende two-dimensional (2D)-CdSe nanosheets both theoretically, by Hartree-renormalized k.p calculations including Coulomb interaction, and experimentally, by temperature-dependent and time-resolved photoluminescence measurements. The observed 2D-heavy hole exciton states show a strong influence of vertical confinement and dielectric screening. A very weak coupling to phonons results in a low phonon-contribution to the homogeneous line-broadening. The 2D-nanosheets exhibit much narrower ensemble absorption and emission linewidths as compared to the best colloidal CdSe nanocrystallites ensembles. Since those nanoplatelets can be easily stacked and tend to roll up as they are large, we see a way to form new types of multiple quantum wells and II-VI nanotubes, for example, for fluorescence markers.

引用

页码：3151 / 3157

页数：7

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