Journal
ACS NANO
Volume 10, Issue 7, Pages 7085-7093Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b03226
Keywords
metal-organic frameworks; thin films; guest loading; TCNQ; electric transport properties; mercury-based tunneling junctions
Categories
Funding
- State of Baden-Wuerttemberg
- China Scholarship Council (CSC)
- European Union [301110]
- Deutsche Forschungsgemeinschaft [ZH 63/14-2]
- STW-DFG project MODEOLED [WE1863/22-1]
- Strukturierung weicher Materie [SFB 1176]
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In the past, nanoporous metal organic frameworks (MOFs) have been mostly studied for their huge potential with regard to gas storage and separation. More recently, the discovery that the electrical conductivity of a widely studied, highly insulating MOF, HKUST-1, improves dramatically when loaded with guest molecules has triggered a huge interest in the charge carrier transport properties of MOFs. The observed high conductivity, however, is difficult to reconcile with conventional transport mechanisms: neither simple hopping nor band transport models are consistent with the available experimental data. Here, we combine theoretical results and new experimental data to demonstrate that the observed conductivity can be explained by an extended hopping transport model including virtual hops through localized MOF states or molecular superexchange. Predictions of this model agree well with precise conductivity measurements, where experimental artifacts and the influence of defects are largely avoided by using well-defined samples and the Hg-drop junction approach.
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