典型文献
Signatures for Coexistence of Monoclinic and Hexagonal Phases in GaTe Nanoflakes
文献摘要：
The burgeoning two-dimensional(2D)layered materials provide a pow-erful strategy to realize efficient light-emitting de-vices.Among them,gallium telluride(GaTe)nanoflakes,showing strong photolumi-nescence(PL)emission from multilayer to bulk crystal,relax the stringent fabrication requirements of nanodevices.However,detailed knowledge on the optical properties of GaTe varies as layer thickness is still missing.Here we perform thickness-dependent PL and Raman spectra,as well as temperature-dependent PL spectra of GaTe nanoflakes.Spectral analysis reveals a spectroscopic signature for the coexistence of both the monoclinic and hexagonal phases in GaTe nanoflakes.To understand the experimental results,we propose a crystal structure where the hexagonal phase is on the top and bottom of nanoflakes while the monoclinic phase is in the middle of the nanoflakes.On the basis of temperature-dependent PL spectra,the optical gap of the hexagonal phase is determined to be 1.849 eV,which can only survive under temperature higher than 200 K with the increasing phonon population.Furthermore,the strength of exciton-phonon interaction of the hexagonal phase is estimated to be 1.24 meV/K.Our results prove the coexistence of dual crystalline phases in multilayer GaTe nanoflakes,which may provoke further exploration of phase transformation in GaTe materials,as well as new applications in 2D light-emitting diodes and heterostructure-based optoelectronics.
文献关键词：
中图分类号：
作者姓名：
Hong-yan Yan;Cheng-bing Qin;Lian-tuan Xiao
作者机构：
State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spec-troscopy Shanxi University Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China
文献出处：
引用格式：
[1]Hong-yan Yan;Cheng-bing Qin;Lian-tuan Xiao-.Signatures for Coexistence of Monoclinic and Hexagonal Phases in GaTe Nanoflakes)[J].化学物理学报（英文版）,2022(06):893-899
A类：
GaTe,Nanoflakes
B类：
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AB值：
0.552414
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