Phonon-Mediated Slow Hot Carrier Dynamics in Lead-Free Cs3Bi2I9 Perovskite Single Crystal

被引：24

作者：

Tailor, Naveen Kumar ^{[1
]}

Maity, Partha ^{[2
]}

Satapathi, Soumitra ^{[1
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Phys, Roorkee 247667, Uttarakhand, India

[2] King Abdullah Univ Sci & Technol KAUST, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2022年 / 13卷 / 22期

关键词：

NEGATIVE PHOTOCONDUCTIVITY; SPECTROSCOPY; IMPACT;

D O I：

10.1021/acs.jpclett.2c01369

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this report, we study the hot carrier cooling mechanism of the Cs3Bi2I9 single crystal by using femtosecond transient reflectance (fs-TR) spectroscopy. We find an unusual slow hot carrier cooling associated with longitudinal optical (LO) and coherent longitudinal acoustic phonons (CLAPs) emission during the deexcitation of the hot carriers. We posit the interplay between the hot-carriers and the LO and CLA phonons in subpicosecond to subnanosecond time scales, respectively, by analyzing the TR kinetics upon perturbation with excess energy. Furthermore, we measured the CLAPs propagation velocity in Cs3Bi2I9 , the crystal, ranging from 1820 to 2000 ms(-1). The elastic constants and frequency of Brillouin oscillations were estimated as 20.08 GPa and 14.66 GHz, respectively. Our discovery delivers new physical insights into how the hot carriers in Cs3Bi2I9 single crystal are coupled with a crystal lattice that controls the hot carrier dynamics.

引用

页码：5260 / 5266

页数：7

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