Negatively Charged and Dark Excitons in CsPbBr3 Perovskite Nanocrystals Revealed by High Magnetic Fields

被引:108
作者
Canneson, Damien [1 ]
Shornikova, Elena V. [1 ,2 ]
Yakovlev, Dmitri R. [1 ,3 ]
Rogge, Tobias [1 ]
Mitioglu, Anatolie A. [4 ]
Ballottin, Mariana V. [4 ]
Christianen, Peter C. M. [4 ]
Lhuillier, Emmanuel [5 ]
Bayer, Manfred [1 ,3 ]
Biadala, Louis [6 ]
机构
[1] Tech Univ Dortmund, Expt Phys 2, D-44227 Dortmund, Germany
[2] Russian Acad Sci, Rzhanov Inst Semicond Phys, Siberian Branch, Novosibirsk 630090, Russia
[3] Russian Acad Sci, Ioffe Inst, St Petersburg 194021, Russia
[4] Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, NL-6525 ED Nijmegen, Netherlands
[5] UPMC Univ Paris 06, Sorbonne Univ, CNRS UMR 7588, Inst NanoSci Paris, F-75005 Paris, France
[6] CNRS, UMR 8520, Inst Elect Microelect & Nanotechnol, Villeneuve Dascq, France
关键词
Perovskite; CsPbBr3; dark exciton; trion; time-resolVed photoluminescence; high magnetic fields; SINGLE-PHOTON EMISSION; BAND-EDGE EXCITON; QUANTUM DOTS; FINE-STRUCTURE; COLLOIDAL NANOCRYSTALS; RECOMBINATION DYNAMICS; HALIDE PEROVSKITES; EFFECTIVE MASSES; BINDING-ENERGY; SEMICONDUCTORS;
D O I
10.1021/acs.nanolett.7b02827
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The optical properties of colloidal cesium lead halide perovskite (CsPbBr3) nanocrystals are examined by time-resolved and polarization-resolved spectroscopy in high, magnetic fields up to 30 T. We unambiguously show that at cryogenic temperatures the emission is dominated by recombination of negatively charged excitons with radiative decay time of 300 ps. The additional long-lived emission; which decay time shortens from 40 down to 8 ns and in which the decay time shortens and relative amplitude increases in high magnetic fields, evidences the presence of a dark exciton. We evaluate g-factors of the bright,exciton g(x) = +2,4, the electron g(e) = +2.18, and the hole g(h) = 0.22.
引用
收藏
页码:6177 / 6183
页数:7
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