Stepwise “Dark Photoswitching” of Photochromic Dimers in a Junction

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• 作者：Stine T. Olsen ; Thorsten Hansen ; Mogens Brøndsted NielsenMark A. Ratner ; Kurt V. Mikkelsen
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：121
• 期：6
• 页码：3163-3170
• 全文大小：527K
• ISSN：1932-7455

文摘

Molecular photoswitches incorporated in a junction present a way to achieve light-controlled conductance switching by photoisomerization. Yet, the two isomers might also interconvert upon charging of the molecule if this results in a change in their relative energies. This behavior (current-induced switching) has been termed dark photoswitching and was observed for the dihydroazulene–vinylheptafulvene couple in a junction. In this theoretical study, we expand this concept to dimeric structures containing two dihydroazulene units linked through meta- or para-phenylene bridges and anchored to the electrodes through different linkers. In particular, we show how stepwise dark photoswitching can be achieved for certain redox states.