通讯机构:
[Zhao, Z.] A;All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province, College of Information and Electronic Engineering, Hunan City University, Yiyang, China
通讯机构:
[Tian, Ye] H;[Tian, Ye] U;Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Peoples R China.;Univ Ghent, Dept Informat Technol, Photon Res Grp, IMEC, B-9000 Ghent, Belgium.
关键词:
Meyer-Neldel rule;persistent photocurrent;trap-limited current
摘要:
A theoretical model is established to describe the emergence of the Meyer-Neldel rule (MNR) based on trap-limited current (TLC) theory. The model produces both MNR and anti-MNR behavior, and is available to various trap distributions. Moreover, TLC-based MNR is connected to persistent photocurrent (PPC) phenomenon. The information from MNR and PPC as well as their connection can be used to probe the distribution of the traps in materials.
期刊:
材料导报,2016年30(5):148-151 and 155 ISSN:1005-023X
作者机构:
[张学军; 蒋练军; 张光富] School of Communication and Electronic Engineering, Hunan City University, Yiyang, 413000, China;[张光富] School of Physics and Electronics, Central South University, Changsha, 410083, China
通讯机构:
[Tian, Ye] H;Hunan City Univ, Sch Commun & Elect Engn, Yiyang 413000, Hunan, Peoples R China.
关键词:
Effective refractive index;Near ultraviolet;Numerical simulation;Physical vapor deposition;Raman scattering;Thin films
摘要:
Hybrid nanostructures composed of plasmonic metal and semiconductor are receiving increasing attentions, owing to their unique optical features that are induced by the co-existence of localized surface plasmon resonance (SPR) and semiconduction as well as the synergistic interactions between these two components. Other than the structures based on conventional noble metals, a cost-effective structure based on non-noble metal is studied in this work. Utilizing the surface dewetting in Bi-Si system, the Bi-nanorod/Si-nanodots hybrid structure (BSHS) is prepared by alternated sputtering of Bi and Si at low rate. The shift, split, and high order excitation of SPRs in BSHS are studied combining numerical and theoretical simulation. Calculations of the optical extinction performed as a function of the size of BSHS show a guideline to tune its spectra.
摘要:
We study the physical-vapor-deposition of 1D bismuth nanostructures. Bi nanowire elongating along [012] and/or [110] direction as well as anisotropic Bi nano-columns are physical-vapor-deposited successfully. The coexistence and competition of surface diffusion and geometric shielding are critical to their formation as well as growth mode transition among them. Since physical-vapor-deposition is a vacuum process, we make use of it to fabricate the ohmic contact to prevent the damage to the bismuth nanostructures brought by the etching to their thick surface oxide layer.
作者:
Jiasheng, Li;Weichu, Xiao;Xuejun, Zhang;Wenguo, Li;Saichun, Hu
期刊:
Information Technology Journal,2012年11(11):1632-1637 ISSN:1812-5638
通讯作者:
Jiasheng, L.
作者机构:
[Xuejun, Zhang; Wenguo, Li; Jiasheng, Li; Saichun, Hu; Weichu, Xiao] College of Communication and Electronic Engineering, Hunan City University, Yiyang, Hunan, 413000, China
通讯机构:
[Jiasheng, L.] C;College of Communication and Electronic Engineering, Hunan City University, China
作者机构:
[高攀; 周文芳; 柳清菊; 吴晶] Yunnan Key Laboratory of Nanomaterials and Technology, Yunnan University, Kunming 650091, China;[张学军] Department of Physics and Electric Information Engineering, Hunan City University, Yiyang 413000, China
通讯机构:
[Liu, QJ ] ;Yunnan Key Laboratory of Nanomaterials and Technology, Yunnan University, China
关键词:
TiO_2;N+Yb-doped;first-principle
摘要:
Crystal structures, electronic structures and optical properties of nitrogen and ytterbium doping anatase TiO_2 were calculated by first principles with the plane-wave ultrasoft pseudopotential method based on the density functional theory. The calculated results show that the octahedral dipole moments in TiO_2 increase due to the changes in lattice parameters, bond length and charges on atoms, which is very effective for the separation of photoexcited electron-hole pairs and the improvement of the photocatalytic activity of TiO_2. The interband transition between OP_π states and Yb4f states make nitrogen and ytterbium doped TiO_2 manifest greater absorption coefficients in the visible-light region.