The adsorption of Cs and residual gases on Ga0.5Al0.5As (001) β2 (2 x 4) surface: A first principles research

被引：15

作者：

Yu, Xiaohua ^{[1
]}

Du, Yujie ^{[1
]}

Chang, Benkang ^{[1
]}

Wang, Honggang ^{[1
,2
]}

Wang, Meishan ^{[2
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Jiangsu, Peoples R China

[2] Ludong Univ, Sch Informat & Elect Engn, Yantai 264025, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2014年 / 290卷

基金：

中国国家自然科学基金;

关键词：

Ga0.5Al0.5As beta(2) (2 x 4) surface; Adsorption; First principles; Work function; Absorption coefficient;

D O I：

10.1016/j.apsusc.2013.11.016

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：

Using quadrupole mass spectrometer (QMS), the residual gases in the ultra-high vacuum system used for photocathodes activation are detected. The adsorption of Cs atom and residual gases molecules on Ga0.5Al0.5As beta(2) (2 x 4) surface are investigated by density functional theory. Results show that Cs lowers the work function while residual gases enhance the work function. The changes of the work function are caused by the electron offsets between the adsorbates and the surface. Cs atom improves the absorption properties while residual gases molecules harm the absorption properties. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：142 / 147

页数：6

共 26 条

[1] EVOLUTION OF ELECTRONIC-PROPERTIES AT THE P-GAAS(CS,O) SURFACE DURING NEGATIVE ELECTRON-AFFINITY STATE FORMATION
ALPEROVICH, VL
PAULISH, AG
SCHEIBLER, HE
TEREKHOV, AS
[J]. APPLIED PHYSICS LETTERS, 1995, 66 (16) : 2122 - 2124
[2] High-efficiency photocathodes on the NEA-GaAs basis
Antonova, LI
Denissov, VP
[J]. APPLIED SURFACE SCIENCE, 1997, 111 : 237 - 240
[3] First-principles study of boron, carbon and nitrogen adsorption on WC(100) surface
Bi, Kai
Liu, Jun
Dai, Qixun
[J]. APPLIED SURFACE SCIENCE, 2012, 258 (10) : 4581 - 4587
[4] Theoretical study of Cs adsorption on GaN(0001) surface
Du Yujie
Chang Benkang
Wang Xiaohui
Zhang Junju
Li Biao
Wang Meishan
[J]. APPLIED SURFACE SCIENCE, 2012, 258 (19) : 7425 - 7429
[5] Zn-induced features at the GaAs(110) surface: a first-principles study
Ferraz, AC
Miotto, R
[J]. VACUUM, 2002, 67 (01) : 31 - 35
[6] INTERACTION OF CS WITH THE GAAS(100) SURFACE
KAMARATOS, M
BAUER, E
[J]. JOURNAL OF APPLIED PHYSICS, 1991, 70 (12) : 7564 - 7572
[7] On the nature of Surface States Stark Effect at clean GaN(0001) surface
Kempisty, Pawel
Krukowski, Stanislaw
[J]. JOURNAL OF APPLIED PHYSICS, 2012, 112 (11)
[8] Correlations in coverage-dependent atomic adsorption energies on Pd(111)
Kitchin, John R.
[J]. PHYSICAL REVIEW B, 2009, 79 (20)
[9] Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set
Kresse, G
Furthmuller, J
[J]. PHYSICAL REVIEW B, 1996, 54 (16): : 11169 - 11186
[10] ABINITIO MOLECULAR-DYNAMICS FOR LIQUID-METALS
KRESSE, G
HAFNER, J
[J]. PHYSICAL REVIEW B, 1993, 47 (01): : 558 - 561

← 1 2 3 →