Negative Differential Conductance in Polyporphyrin Oligomers with Nonlinear Backbones

Guowen Kuang, Shi Zhang Chen, Linghao Yan, Ke Qiu Chen*, Xuesong Shang, Pei Nian Liu, Nian Lin

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

57 Citations (Scopus)

Abstract

We study negative differential conductance (NDC) effects in polyporphyrin oligomers with nonlinear backbones. Using a low-temperature scanning tunneling microscope, we selectively controlled the charge transport path in single oligomer wires. We observed robust NDC when charge passed through a T-shape junction, bistable NDC when charge passed through a 90° kink and no NDC when charge passed through a 120° kink. Aided by density functional theory with nonequilibrium Green's functions simulations, we attributed this backbone-dependent NDC to bias-modulated hybridization of the electrode states with the resonant transport molecular orbital. We argue this mechanism is generic in molecular systems, which opens a new route of designing molecular NDC devices.

Original languageEnglish
Pages (from-to)570-573
Number of pages4
JournalJournal of the American Chemical Society
Volume140
Issue number2
DOIs
Publication statusPublished - 17 Jan 2018
MoE publication typeA1 Journal article-refereed

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