How do electronic carriers cross Si-bound alkyl monolayers?

Details How do electronic carriers cross Si-bound alkyl monolayers? How do electronic carriers cross Si-bound alkyl monolayers?

2005-09-26

arxiv.org/abs/cond-mat/0509640v1

Physics

Condensed Matter

Materials Science

13 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.266807

Electron transport through Si-C bound alkyl chains, sandwiched between n-Si and Hg, is characterized by two distinct types of barriers, each dominating in a different voltage range. At low voltage, current depends strongly on temperature but not on molecular length, suggesting transport by thermionic emission over a barrier in the Si. At higher voltage, the current decreases exponentially with molecular length, suggesting tunneling through the molecules. The tunnel barrier is estimated, from transport and photoemission data, to be ~1.5 eV with a 0.25me effective mass.

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