Matrix-Mediated Control of Stochastic Single Molecule Conductance Switching : Review Paper

概要

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We have analyzed the conductance switching of single phenylene ethynylene oligomers embedded in matrices of alkanethiolates. When the molecules are studied using scanning tunneling microscopy, they switch reversibly between discrete states that differ in their apparent height by 〜3 Å. The persistence times for molecules in either state ranges from seconds to tens of hours. We demonstrate several methods to control the defect density and quality of the host alkanethiolate matrix, which in turn affects the rate at which the inserted molecules switch. A vapor annealing procedure is described that increases order in the matrix film and reduces the switching rate. Decreased matrix deposition time results in a less-ordered film that increases the switching rate. Because the molecular switching depends on matrix order, we conclude that the switching is a result of motions of the molecules or bundles, rather than electrostatic effects of charge transfer.
社団法人応用物理学会の論文
2002-07-30