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

[21] Thermal annealing-induced vertical phase separation of copper phthalocyanine: Fullerene bulk heterojunction in organic photovoltaic cells [J].