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Effect of Central Metal Ion on Molecular Dipole in Porphyrin Self-Assembled Monolayers

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Title Effect of Central Metal Ion on Molecular Dipole in Porphyrin Self-Assembled Monolayers
 
Creator KHADERBAD, MA
RAO, M
JINESH, KB
PANDHARIPANDE, R
MADHU, S
RAVIKANTH, M
RAO, VR
 
Subject Work Function Tuning
Porphyrin
High-K
Dipole
Self Assembled Monolayer
FIELD-EFFECT TRANSISTORS
INTERFACES
 
Description The physical and electronic properties of nano-scale semiconductor devices are mainly decided by their surfaces and interfaces. Use of dipolar self-assembled monolayer (SAM) on semiconductor/oxide interfaces has an enormous potential to tailor the behavior of nanoelectronic, optical and biological devices. Among different molecules, porphyrins have been identified to form chemically stable SAMs on different substrates and their dipolar properties can be tuned by incorporating various metal species in them. This allows work-function tuning according to various technological needs. In this paper, we describe the effect of central metal ion (selected period-4 transition metal ions Zn, Cu, Ni, Fe and Co) incorporated in 5-(4-hydroxyphenyl)-10,15,20-tri(p-tolyl)porphyrin (TTPOH) on the surface potential using Kelvin probe microscopy. Density functional theory (DFT) calculations were performed to estimate the magnitude of dipole moments. Also, absorption spectra of TTPOH molecule and its metal derivatives are compared.
 
Publisher AMER SCIENTIFIC PUBLISHERS
 
Date 2014-10-16T06:42:09Z
2014-10-16T06:42:09Z
2012
 
Type Article
 
Identifier NANOSCIENCE AND NANOTECHNOLOGY LETTERS, 4(7)729-732
http://dx.doi.org/10.1166/nnl.2012.1380
http://dspace.library.iitb.ac.in/jspui/handle/100/15461
 
Language en