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Understanding resonant charge transport through weakly coupled single-molecule junctions
摘要： Off-resonant charge transport through molecular junctions has been extensively studied since the advent of single-molecule electronics and is now well understood within the framework of the non-interacting Landauer approach. Conversely, gaining a qualitative and quantitative understanding of the resonant transport regime has proven more elusive. Here, we study resonant charge transport through graphene-based zinc-porphyrin junctions. We experimentally demonstrate an inadequacy of non-interacting Landauer theory as well as the conventional single-mode Franck–Condon model. Instead, we model overall charge transport as a sequence of non-adiabatic electron transfers, with rates depending on both outer and inner-sphere vibrational interactions. We show that the transport properties of our molecular junctions are determined by a combination of electron–electron and electron-vibrational coupling, and are sensitive to interactions with the wider local environment. Furthermore, we assess the importance of nuclear tunnelling and examine the suitability of semi-classical Marcus theory as a description of charge transport in molecular devices.
关键词： Marcus theory,single-molecule junctions,electron-vibrational coupling,electron transfers,resonant charge transport,Landauer theory,Franck–Condon model,electron–electron interactions
更新于2025-09-19 17:13:59
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Comparative Study of Single Molecular Junctions with <i>Para</i> -Phthalic Acid and <i>Meta</i> -Phthalic Acid Binding to Different Metal Electrodes
摘要： In this paper, single molecular junctions of para-phthalic acid and meta-phthalic acid with Au electrodes were studied by STM break junction approach. Conductance values of 10?3(cid:2)55 G0 and 10?3(cid:2)70 G0 were found for para-phthalic acid and meta-phthalic acid, respectively. The conductance order between para-phthalic acid and meta-phthalic acid with Au is different from that with Cu, which can be contributed to the different coupling between molecules and electrodes; different through-space interaction is proposed for such phenomenon between Cu and Au electrodes. Furthermore, the breaking off distances can re?ect the length of molecules. The current work presents the important role of electrode in single molecular junctions with different position anchoring groups.
关键词： STM-BJ,Meta-Phthalic Acid,Carboxylic Acid,Para-Phthalic Acid,Single-Molecule Junctions
更新于2025-09-04 15:30:14