Molecularly Controlled Metal−Semiconductor Junctions on Silicon Surface: A Dipole Effect

Molecularly Controlled Metal−Semiconductor Junctions on Silicon Surface: A Dipole Effect

Silicon surface was chemically modified by covalent attachment of homologous organic molecules having different dipole moments. Surface photovoltage measurements clearly confirm that organic molecules have a profound effect on surface band bending of semiconductor. Metal-molecules−silicon junctions...

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Veröffentlicht in:Langmuir 2008-10, Vol.24 (19), p.11300-11306
Hauptverfasser: Hiremath, R. K, Rabinal, M. K, Mulimani, B. G, Khazi, I. M
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Sprache:eng
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Chemistry
Colloidal state and disperse state
Devices and Applications: Sensors, Fluidics, Patterning, Catalysis, Photonic Crystals
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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container_issue 19
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container_title Langmuir
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creator Hiremath, R. K
Rabinal, M. K
Mulimani, B. G
Khazi, I. M
description Silicon surface was chemically modified by covalent attachment of homologous organic molecules having different dipole moments. Surface photovoltage measurements clearly confirm that organic molecules have a profound effect on surface band bending of semiconductor. Metal-molecules−silicon junctions were constituted for molecules belonging to ethynylbenzene series using soft mercury contact. These junctions show a systematic change in the electrical charge transport with dipole moment of molecules. Parameters such as ideality factor, barrier height, and density of interface states of various junctions are estimated to understand the role of organic molecules. These studies offer the prospect to develop molecular electronics, which may find potential applications in solar cells and chemical and biological sensors.
doi_str_mv 10.1021/la800882e
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subjects Chemistry
Colloidal state and disperse state
Devices and Applications: Sensors, Fluidics, Patterning, Catalysis, Photonic Crystals
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
title Molecularly Controlled Metal−Semiconductor Junctions on Silicon Surface: A Dipole Effect
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