Mechanism of Cs2CO3 as an n-type dopant in organic electron-transport film

被引：70

作者：

Cai, Y. ^{[1
]}

Wei, H. X. ^{[1
]}

Li, J. ^{[1
]}

Bao, Q. Y. ^{[1
]}

Zhao, X. ^{[2
]}

Lee, S. T. ^{[3
]}

Li, Y. Q. ^{[1
]}

Tang, J. X. ^{[1
]}

机构：

[1] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China

[2] Suzhou Univ Sci & Technol, Coll Chem & Biol Engn, Suzhou 215011, Peoples R China

[3] City Univ Hong Kong, Dept Phys & Mat Sci, Ctr Super Diamond & Adv Films COSDAF, Hong Kong, Hong Kong, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2011年 / 98卷 / 11期

基金：

高等学校博士学科点专项科研基金;

关键词：

LIGHT-EMITTING DEVICES; THIN-FILMS; HIGH-EFFICIENCY; CATHODE; PERFORMANCE; IMPROVEMENT; INJECTION; LAYER;

D O I：

10.1063/1.3567526

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electronic structures of cesium carbonate (Cs2CO3) doped 4,7-diphenyl-1,10-phenanthroline (BPhen) films with various doping concentration are characterized by in situ ultraviolet and x-ray photoelectron spectroscopies, in an attempt to understand the mechanism of electron-transport enhancement in Cs2CO3-doped organic electron-transport layer for organic optoelectronic devices. The n-type electrical doping effect is evidenced by the Fermi level shift in the Cs2CO3-doped BPhen films toward unoccupied molecular states with increasing doping concentration, leading to increase in electron concentration in the electron-transport layer and reduction in electron injection barrier height. These findings originate from energetically favorable electron transfer from Cs2CO3 to BPhen. (C) 2011 American Institute of Physics. [doi:10.1063/1.3567526]

引用

页数：3

共 25 条

[1]

[Anonymous], 1995, Handbook of X-ray Photoelectron Spectroscopy. A Reference Book of Standard Spectra for Identification and Interpretation of XPS Data

[2] Electronic structures of MoO3-based charge generation layer for tandem organic light-emitting diodes [J].

Bao, Q. Y. ;

Yang, J. P. ;

Li, Y. Q. ;

Tang, J. X. .

APPLIED PHYSICS LETTERS, 2010, 97 (06)

[3] Decamethylcobaltocene as an efficient n-dopant in organic electronic materials and devices [J].

Chan, Calvin K. ;

Zhao, Wei ;

Barlow, Stephen ;

Marder, Seth ;

Kahn, Antoine .

ORGANIC ELECTRONICS, 2008, 9 (05) :575-581

[4] Cesium carbonate as a functional interlayer for polymer photovoltaic devices [J].

Chen, Fang-Chung ;

Wu, Jyh-Lih ;

Yang, Sidney S. ;

Hsieh, Kuo-Huang ;

Chen, Wen-Chang .

JOURNAL OF APPLIED PHYSICS, 2008, 103 (10)

[5] The roles of thermally evaporated cesium carbonate to enhance the electron injection in organic light emitting devices [J].

Chen, Mei-Hsin ;

Wu, Chih-I .

JOURNAL OF APPLIED PHYSICS, 2008, 104 (11)

[6] Real-time three-dimensional surface measurement by color encoded light projection [J].

Chen, S. Y. ;

Li, Y. F. ;

Guan, Q. ;

Xiao, G. .

APPLIED PHYSICS LETTERS, 2006, 89 (11)

[7] Effect of magnesium oxide buffer layer on performance of inverted top-emitting organic light-emitting diodes [J].

Choi, Ho Won ;

Kim, Soo Young ;

Kim, Woong-Kwon ;

Hong, Kihyon ;

Lee, Jong-Lam .

JOURNAL OF APPLIED PHYSICS, 2006, 100 (06)

[8] Improved performance in n-channel organic thin film transistors by nanoscale interface modification [J].

Chu, Chih-Wei ;

Sung, Chao-Feng ;

Lee, Yuh-Zheng ;

Cheng, Kevin .

ORGANIC ELECTRONICS, 2008, 9 (02) :262-266

[9]

Hasegawa T., 2004, SID Symposium Digest of Technical Papers, V35, P154

[10] Highly efficient p-i-n white organic light emitting devices with tandem structure [J].

Ho, Meng-Huan ;

Chen, Teng-Ming ;

Yeh, Pu-Cheng ;

Hwang, Shiao-Wen ;

Chen, Chin H. .

APPLIED PHYSICS LETTERS, 2007, 91 (23)

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