Ag(110)表面并四苯薄膜生长光电子谱研究  

Photoemission Spectroscopy Studies of Tetracene Overlayer on Ag(110)

作　　者：陶永升[1] 张寒洁[1] 吕斌[1] 黄寒[1] 李海洋[1] 鲍世宁[1] 何丕模[1] 

机构地区：[1]浙江大学物理系,杭州310027

出　　处：《真空科学与技术学报》2005年第1期1-3,17,共4页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金 (No 10 2 740 72 ) ;高校博士点专项科研基金 (No 2 0 0 3 0 3 3 5 0 17)

摘　　要：利用光电子能谱研究了有机半导体并四苯 (tetracene)与金属Ag(110 )界面的相互作用特性和电子性质 ,UPS测量给出tetracene的价带结构 ,其价带顶 (HOS)位于费密能级以下约 2 6eV处。XPS测量显示Ag 3d和C 1s谱峰几乎没有位移 ,表明tetranece与衬底Ag之间相互作用弱。随着tetracene在Ag(110 )表面的沉积 ,功函数在初始阶段快速减小 ,继续沉积te tracene其功函数回升并达到饱和。tetracene沉积初始阶段的功函数减小归结于有机分子在表面的极化 ,而随后增加的起因则是有机分子间的退极化。Photoemission spectroscopy measurements of the tetracene film deposited on the Ag(110) surface were performed. The valence features of tetracene are given with UPS measurements. The highest occupied molecular orbital (HOMO) of tetracene is at 2.6 eV below Fermi level. Both Ag 3 d and C 1s core levels in XPS measurements showed almost no shift, indicating that the interaction between tetracene and the Ag substrate is relatively weak. The work function decreases sharply at the initial tetracene deposition, to a minimum value at about a monolayer of tetracene, and then increases with tetracene thickness to a saturated value. The sharp decrease in work function at the initial tetracene deposition is attributed to the dipole layer formed by the surface polarization of tetracene, and the subsequent increase with tetracene thickness associates with the depolarization among the tetracene molecules.

关 键 词：光电子谱 薄膜生长 价带 带结构 有机分子 电子性质 能级 功函数 有机半导体 极化 

分 类 号：TB82[一般工业技术—摄影技术] O484[理学—固体物理]