期刊
ACS NANO
卷 8, 期 9, 页码 9173-9180出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn502794z
关键词
molecular dipole; self-assembled monolayer; injection barrier; organic electronics; work function; interface dipole
类别
资金
- FP7 project MMM@HPC EC
The alignment of the electrode Fermi level with the valence or conduction bands of organic semiconductors is a key parameter controlling the efficiency of organic light-emitting diodes, solar cells, and printed circuits. Here, we introduce a class of organic molecules that form highly robust dipole layers, capable of shifting the work function of noble metals (Au and Ag) down to 3.1 eV, that is, similar to 1 eV lower than previously reported self-assembled monolayers. The physics behind the considerable interface dipole is elucidated by means of photoemission spectroscopy and density functional theory calculations, and a polymer diode exclusively based on the surface modification of a single electrode in a symmetric, two-terminal Au/poly(3-hmIthiophene)/Au junction is presented. The diode exhibits the remarkable rectification ratio of similar to 2 center dot 10(3) showing high reproducibility, durability (>3 years), and excellent electrical stability. With this evidence, noble metal electrodes with work function values comparable to that of standard cathode materials used in optoelectronic applications are demonstrated.
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