Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets

被引：91

作者：

Shornikova, Elena V. ^{[1
,2
]}

Biadala, Louis ^{[1
,3
]}

Yakovlev, Dmitri R. ^{[1
,4
]}

Sapega, Victor F. ^{[4
]}

Kusrayev, Yuri G. ^{[4
]}

Mitioglu, Anatolie A. ^{[5
]}

Ballottin, Mariana V. ^{[5
]}

Christianen, Peter C. M. ^{[5
]}

Belykh, Vasilii V. ^{[1
,6
]}

Kochiev, Mikhail V. ^{[6
]}

Sibeldin, Nikolai N. ^{[6
]}

Golovatenko, Aleksandr A. ^{[4
]}

Rodina, Anna V. ^{[4
]}

Gippius, Nikolay A. ^{[7
]}

Kuntzmann, Alexis ^{[8
]}

Jiang, Ye ^{[8
]}

Nasilowski, Michel ^{[8
]}

Dubertret, Benoit ^{[8
]}

Bayer, Manfred ^{[1
,4
]}

机构：

[1] Tech Univ Dortmund, Expt Phys 2, D-44221 Dortmund, Germany

[2] Russian Acad Sci, Rzhanov Inst Semicond Phys, Siberian Branch, Novosibirsk 630090, Russia

[3] CNRS, Inst Elect Microelect & Nanotechnol, F-59652 Villeneuve Dascq, France

[4] Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia

[5] Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, NL-6525 ED Nijmegen, Netherlands

[6] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia

[7] Skolkovo Inst Sci & Technol, Moscow 143026, Russia

[8] ESPCI, CNRS, Lab Phys & Etud Mat, F-75231 Paris, France

来源：

NANOSCALE | 2018年 / 10卷 / 02期

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

THRESHOLD STIMULATED-EMISSION; QUANTUM-WELLS; MAGNETIC POLARON; DARK-EXCITON; DOTS; RECOMBINATION; NANOSHEETS; THICKNESS; NANOSTRUCTURES; ABSORPTION;

D O I：

10.1039/c7nr07206f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We study the band-edge exciton fine structure and in particular its bright-dark splitting in colloidal semiconductor nanocrystals by four different optical methods based on fluorescence line narrowing and time-resolved measurements at various temperatures down to 2 K. We demonstrate that all these methods provide consistent splitting values and discuss their advances and limitations. Colloidal CdSe nanoplatelets with thicknesses of 3, 4 and 5 monolayers are chosen for experimental demonstrations. The bright-dark splitting of excitons varies from 3.2 to 6.0 meV and is inversely proportional to the nanoplatelet thickness. Good agreement between experimental and theoretically calculated size dependence of the bright-dark exciton splitting is achieved. The recombination rates of the bright and dark excitons and the bright to dark relaxation rate are measured by time-resolved techniques.

引用

页码：646 / 656

页数：11

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