Lattice Dynamics and Contraction of Energy Bandgap in Photoexcited Semiconducting BN Nanotubes.

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ID: 51088
2019
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Abstract
Structural dynamics and changes in electronic structures driven by photoexcited carriers are critical issues in both semiconducting and optoelectronic nanodevices. Herein, a phase diagram for the transient states and relevant dynamic processes in multi-walled BN nanotubes (BNNTs) has been extensively studied for a full reversible cycle after a fs-laser excitation in ultrafast TEMs, and the significant structural features and evolution of electronic natures have been investigated using pulsed electron diffraction and femtosecond-resolved electron energy-loss spectroscopy (EELS). It is revealed that nonthermal anisotropic alterations of the lattice apparently precede the phonon-driven thermal transients along the radial and axial directions. Ab-initio calculations support these findings and show that electrons excited from the π to π* orbitals in the BN nanotubes weaken the intralayer bonds while strengthening the interlayer bonds along the radial direction. Importantly, time-resolved EELS measurements show remarkable contraction of the energy bandgap after fs-laser excitation associated with nonthermal structural transients. This fact verifies that laser-induced bandgap renormalisation in semiconductors can essentially be correlated with both the rapid processes of excited carriers and nonthermal lattice evolution.
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li2019latticeacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Zhongwen;Xiao, Rui-Juan;Xu, Peng;Zhu, Chunhui;Sun, Shuaishuai;Zheng, Dingguo;Wang, Hong;Zhang, Ming;Tian, Huanfang;Yang, Huai-Xin;Li, Jian-Qi;
Journal acs nano
Year 2019
DOI
10.1021/acsnano.9b05466
URL
Keywords
mxene mxene/s cathodes sodium−sulfur batteries sulfur loading sulfur-doping

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