Abstract
The electrical transport properties of the molecular nanosilver chain have been investigated. We observed the symmetric negative differential resistance (NDR) in the current-voltage characteristics. The peak voltage (VP) increased but the peak current (IP) decreased upon cooling. The self-capacitance effect of the silver chain crystal is suggested to explain this unconventional NDR phenomenon.
Highlights
Negative differential resistance (NDR) has attracted much interest due to its applications for switch, memory, and high-speed logic devices
NDR explained by a resonance tunneling diode has been shown in various materials, such as germanium p-n junction [1], various heterostructures [2,3,4,5,6], semiconductor superlattices [7], self-assembled layered nanostructures [8], carbon atomic wires [9], mesoscopic manganite structures [10], and molecular electronics device systems [11,12,13]
The NDR has been observed in graphene nanoribbon with unsaturated edges due to the strong current polarization [14] and due to the interaction between the narrow density of state of doped sites and the discrete states in the scattering region [15]
Summary
Negative differential resistance (NDR) has attracted much interest due to its applications for switch, memory, and high-speed logic devices. NDR phenomena in general, including those mentioned above, exhibited asymmetric current-voltage (IV) characteristics with respect to the applied voltage. Moon et al reported a stair-shaped Ag0 coordination compound without bridging ligands (nanosilver chain) [17]. This nanosilver chain (NSC) consists of Ag atoms linked by covalent bonds and pyridine molecules. We report the abnormal N-shaped NDR phenomenon of the single crystalline NSC and temperature-dependent NDR behavior that cannot be interpreted by previously reported mechanisms. We suggest that the NDR phenomenon of the NSC may be caused by a capacitance effect of the NSC itself
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