Effect of A-Site Cation on Photoluminescence Spectra of Single Lead Bromide Perovskite Nanocrystals

被引：39

作者：

Masada, Sojiro ^{[1
]}

Yamada, Takumi ^{[1
]}

Tahara, Hirokazu ^{[1
]}

Hirori, Hideki ^{[1
]}

Saruyama, Masaki ^{[1
]}

Kawawaki, Tokuhisa ^{[1
]}

Sato, Ryota ^{[1
]}

Teranishi, Toshiharu ^{[1
]}

Kanemitsu, Yoshihiko ^{[1
]}

机构：

[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

来源：

NANO LETTERS | 2020年 / 20卷 / 05期

关键词：

Metal halide perovskite; Nanocrystal; Single-dot spectroscopy; Electron-phonon coupling; HALIDE PEROVSKITES; EXCITONS; DYNAMICS; RECOMBINATION; CH3NH3PBI3; BIEXCITONS; ABSORPTION; CHALLENGES; DIFFUSION; EMISSION;

D O I：

10.1021/acs.nanolett.0c01417

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Lead halide perovskite (APbX(3)) nanocrystals exhibit photoluminescence (PL) with both wide wavelength tunability and high quantum efficiency. While the Pb-X-6 octahedra mainly determines the near-band-edge optical properties and the A-site cation affects the structural stability, the role of the A-site cation in determining the optical properties is still unclear. Here, we report the PL properties of three types of lead bromide perovskite APbBr(3) nanocrystals with different cations [A = HC(NH2)(2)(+), CH3NH3+, and Cs+], as revealed by single-dot spectroscopy, and discuss the influence of the A-site cation on the PL spectrum. The nanocrystal size dependences of the PL energy and lifetime show no large variation with the species of the A-site cation. We find that the size of the A-site cation determines the coupling strength between electrons and longitudinal-optical phonons in the nanocrystal and thus affects the PL spectral shape, especially the low-energy tail.

引用

页码：4022 / 4028

页数：7

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