Photoinduced interfacial charging and "explosion" of monolayer pentacene islands

被引:12
作者
Chen, LW [1 ]
Cherniavskaya, O [1 ]
Shalek, A [1 ]
Brus, LE [1 ]
机构
[1] Columbia Univ, Dept Chem, New York, NY 10027 USA
关键词
D O I
10.1021/nl051567m
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Electrostatic force microscopy shows that the electric field gradients above pentacene monoiayer islands on 2-nm SiO2/Si substrates, in a dark, dry nitrogen environment, display a wide distribution of signs and magnitude that is dependent on sample history. Under 12 mW/cm(2) green (532 nm) illumination, pentacene islands accumulate positive charge because of photoexcited electron transfer across the oxide to the Si substrate, At a strong illumination of 60 mW/cm(2), pentacene islands reform into small spherical particles, apparently because the positive charge Coulomb repulsion energy becomes comparable to the cohesive energy of the pentacene monolayer.
引用
收藏
页码:2241 / 2245
页数:5
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