Long-Lived Exciton Coherence in Mixed-Halide Perovskite Crystals

被引：5
|
作者：
Grisard, Stefan [1 ]
Trifonov, Artur V. V. [1 ]
Solovev, Ivan A. A. [1 ,2 ]
Yakovlev, Dmitri R. R. [1 ]
Hordiichuk, Oleh [3 ,4 ]
Kovalenko, Maksym V. V. [3 ,4 ]
Bayer, Manfred [1 ]
Akimov, Ilya A. A. [1 ]
机构：
[1] Tech Univ Dortmund, Expt Phys 2, D-44221 Dortmund, Germany
[2] Carl von Ossietzky Univ Oldenburg, Inst Phys, D-26129 Oldenburg, Germany
[3] Swiss Fed Inst Technol, Dept Chem & Appl Biosci, Lab Inorgan Chem, CH-8093 Zurich, Switzerland
[4] Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, CH-8600 Dubendorf, Switzerland
来源：
NANO LETTERS | 2023年 / 23卷 / 16期
基金：
瑞士国家科学基金会;
关键词：
Photon echo; four-wave mixing; lead halideperovskite semiconductor; FAPbI(3); excitoncoherence time; T (2); LOCALIZED EXCITONS; PHOTON-ECHO; BINDING-ENERGY; QUANTUM; SPECTROSCOPY;
D O I：
10.1021/acs.nanolett.3c01817
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Compositionalengineering of the optical properties ofhybrid organic-inorganiclead halide perovskites is crucial for the realization of efficientsolar cells and light-emitting devices. We study the effect of bandgap fluctuations on coherent exciton dynamics in a mixed FA(0.9)Cs(0.1)PbI(2.8)Br(0.2) perovskite crystalby using photon echo spectroscopy. We reveal a narrow homogeneousexciton line width of 16 & mu;eV at a temperature of 1.5 K. Thecorresponding exciton coherence time T (2) = 83 ps is exceptionally long due to the localization of excitonsat the scale of tens to hundreds of nanometers. From spectral andtemperature dependences of the two- and three-pulse photon echo decay,we conclude that for low-energy excitons pure decoherence associatedwith elastic scattering on phonons is comparable with the excitonlifetime, while for excitons with higher energies, inelastic scatteringto lower energy states via phonon emission dominates.
引用
收藏
页码：7397 / 7403
页数：7
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