Energy level alignment between C60 and Al using ultraviolet photoelectron spectroscopy

被引:15
作者
Seo, J. H.
Kang, S. J.
Kim, C-Y
Cho, S. W.
Yoo, K. -H.
Whang, C. N. [1 ]
机构
[1] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea
[2] Univ Illinois, Urbana, IL 61801 USA
关键词
C-60; Al; ultraviolet photoelectron spectroscopy; electronic structure;
D O I
10.1016/j.apsusc.2005.12.095
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
The energy level alignment between C-60 and Al has been investigated by using ultraviolet photoelectron spectroscopy. To obtain the interfacial electronic structure between C-60 and Al, C-60 was deposited on a clean Al substrate in a stepwise manner. The valence-band spectra were measured immediately after each step Of C-60 deposition without breaking the vacuum. The measured onset of the highest occupied molecular orbital energy level was located at 1.59 eV from the Fermi level of Al. The vacuum level was shifted 0.68 eV toward lower binding energy with additional C-60 layers. The observed vacuum level shift means that the interface dipole exists at the interface between C-60 and Al. The barrier height of electron injection from Al to C-60 is 0.11 eV, which is smaller value than that of hole injection. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:8015 / 8017
页数:3
相关论文
共 17 条
[1]   Photovoltaic properties of polymer-based solar cells [J].
Ahn, YJ ;
Kang, GW ;
Lee, CH ;
Yeom, IS ;
Jin, SH .
SYNTHETIC METALS, 2003, 137 (1-3) :1447-1448
[2]   Examination of EL and PL properties of MCHM-PPV and MEH-PPV: a study towards introduction of a new series of thin film EL devices [J].
Choo, DJ ;
Talaie, A ;
Lee, YK ;
Jang, J ;
Park, SH ;
Huh, G ;
Yoo, KH ;
Lee, JY .
THIN SOLID FILMS, 2000, 363 (1-2) :37-41
[3]   Photoelectron spectroscopic investigation of in-vacuum-prepared luminescent polymer thin films directly from solution [J].
Dam, N ;
Beerbom, MM ;
Braunagel, JC ;
Schlaf, R .
JOURNAL OF APPLIED PHYSICS, 2005, 97 (02)
[4]   Metal-dependent charge transfer and chemical interaction at interfaces between 3,4,9,10-perylenetetracarboxylic bisimidazole and gold, silver and magnesium [J].
Hill, I. G. ;
Schwartz, J. ;
Kahn, A. .
ORGANIC ELECTRONICS, 2000, 1 (01) :5-13
[5]   Organic solar cells: An overview [J].
Hoppe, H ;
Sariciftci, NS .
JOURNAL OF MATERIALS RESEARCH, 2004, 19 (07) :1924-1945
[6]  
Ishii H, 1999, ADV MATER, V11, P605, DOI 10.1002/(SICI)1521-4095(199906)11:8<605::AID-ADMA605>3.0.CO
[7]  
2-Q
[8]  
Kang SJ, 2005, J KOREAN PHYS SOC, V46, pL760
[9]  
Kang SJ, 2005, J KOREAN PHYS SOC, V46, P1148
[10]   Fabrication of ambipolar field-effect transistor device with heterostructure of C60 and pentacene [J].
Kuwahara, E ;
Kubozono, Y ;
Hosokawa, T ;
Nagano, T ;
Masunari, K ;
Fujiwara, A .
APPLIED PHYSICS LETTERS, 2004, 85 (20) :4765-4767