Phonon Mode Transformation Across the Orthohombic-Tetragonal Phase Transition in a Lead Iodide Perovskite CH3NH3Pbl3: A Terahertz Time-Domain Spectroscopy Approach

被引：115

作者：

La-o-vorakiat, Chan ^{[1
,2
,8
]}

Xia, Huanxin ^{[3
]}

Kadro, Jeannette ^{[3
,9
]}

Salim, Teddy ^{[4
]}

Zhao, Daming ^{[3
]}

Ahmed, Towfiq ^{[5
]}

Lam, Yeng Ming ^{[4
]}

Zhu, Jian-Xin ^{[5
,7
]}

Marcus, Rudolph A. ^{[3
,6
]}

Michel-Beyerle, Maria-Elisabeth ^{[3
]}

Chia, Elbert E. M. ^{[3
]}

机构：

[1] King Mongkuts Univ Technol Thonburi, Nanosci & Nanotechnol Grad Program, Bangkok 10140, Thailand

[2] King Mongkuts Univ Technol Thonburi, Fac Sci, Theoret & Computat Sci Ctr TaCS, Bangkok 10140, Thailand

[3] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

[4] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[5] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[6] CALTECH, Noyes Lab, Pasadena, CA 91125 USA

[7] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[8] King Mongkuts Univ Technol Thonburi, Fac Sci, Bangkok 10140, Thailand

[9] Ecole Polytech Fed Lausanne, Lab Sci Photomol, CH-1015 Lausanne, Switzerland

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2016年 / 7卷 / 01期

关键词：

ORGANOLEAD HALIDE PEROVSKITE; HIGH-PERFORMANCE; SLOW-ELECTRONS; LOW-COST; MOBILITIES; DISORDER; FILMS;

D O I：

10.1021/acs.jpclett.5b02223

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：

We study the temperature-dependent phonon modes of the organometallic lead iodide perovskite CH3NH3PbI3 thin film across the terahertz (0.5-3 THz) and temperature (20-300 K) ranges. These modes are related to the vibration of the Pb-I bonds. We found that two phonon modes in the tetragonal phase at room temperature split into four modes in the low-temperature orthorhombic phase. By use of the Lorentz model fitting, we analyze the critical behavior of this phase transition. The carrier mobility values calculated from the low-temperature phonon mode frequencies, via two theoretical approaches, are found to agree reasonably with the experimental value (similar to 2000 cm(2) V-1 s(-1)) from a previous time-resolved THz spectroscopy work. Thus, we have established a possible link between terahertz phonon modes and the transport properties of perovskite-based solar cells.

引用

页码：1 / 6

页数：6

共 44 条

[1] Optical properties of organometallic perovskite: An ab initio study using relativistic GW correction and Bethe-Salpeter equation [J].