期刊
APPLIED PHYSICS LETTERS
卷 98, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3567526
关键词
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资金
- NSFC [91027041, 61007020, 61036009, 60937001]
- 863 Program [20 08AA03A327]
- 973 Program [2011CB808404, 2010CB934502]
- Research Fund for the Doctoral Program of Higher Education of China [20093201120019, 20103201120019]
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]
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