Charge Transport Characteristics of Diarylethene Photoswitching Single-Molecule Junctions
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- 作者：Youngsang Kim ; Thomas J. Hellmuth ; Dmytro Sysoiev ; Fabian Pauly ; Torsten Pietsch ; Jannic Wolf ; Artur Erbe ; Thomas Huhn ; Ulrich Groth ; Ulrich E. Steiner ; Elke Scheer
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：July 11, 2012
- 年：2012
- 卷：12
- 期：7
- 页码：3736-3742
- 全文大小：411K
- 年卷期：v.12,no.7(July 11, 2012)
- ISSN：1530-6992
文摘
We report on the experimental analysis of the charge transport through single-molecule junctions of the open and closed isomers of photoswitching molecules. Sulfur-free diarylethene molecules are developed and studied via electrical and optical measurements as well as density functional theory calculations. The single-molecule conductance and the current鈥搗oltage characteristics are measured in a mechanically controlled break-junction system at low temperatures. Comparing the results with the single-level transport model, we find an unexpected behavior of the current-dominating molecular orbital upon isomerization. We show that both the side chains and end groups of the molecules are crucial to understand the charge transport mechanism of photoswitching molecular junctions.