Fabrication and Characterization of GaN-Based Two Terminal Devices for Liquid Sensing

Gallium Nitride (GaN) based materials are highly suitable for liquid-phase sensor applications due to their chemical stability and high internal piezoelectric polarization. The sensitivity of GaN surfaces in aqueous solutions and polar liquids has been investigated. For this purpose, two terminal de...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011-02, Vol.17 (1), p.012024-9
Main Authors: Jeat, Wang Soo, Abidin, Mastura Shafinaz Zainal, Hashim, Abdul Manaf, Rahman, Shaharin Fadzli Abd, Sharifabad, Maneea Eizadi, Mustafa, Farahiyah, Rahman, Abdul Rahim Abdul, Qindeel, Rabia, Omar, Nurul Afzan
Format: Article
Language:English
Subjects:
Aluminum gallium nitrides
Aqueous solutions
Current voltage characteristics
Devices
Dipole moment
Dipole moments
Drains
Gallium nitrides
Heterostructures
Liquid phases
Liquids
Piezoelectricity
Sensitivity analysis
Terminals
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Summary:Gallium Nitride (GaN) based materials are highly suitable for liquid-phase sensor applications due to their chemical stability and high internal piezoelectric polarization. The sensitivity of GaN surfaces in aqueous solutions and polar liquids has been investigated. For this purpose, two terminal devices fabricated on bulk Si doped-GaN structures and undoped-AlGaN/GaN heterostructures with unpassivated open area are used to measure the responses to the changes of the H+ concentration in aqueous solutions and the dipole moment in polar liquids. The I–V characteristics show that the devices are able to distinguish the variations of pH. It is observed that the drain current decreases linearly with pH for both device structures. Evaluating the sensitivity in aqueous solutions at VDS 2V, a quite large current change is obtained for both structures. For the response to polar liquids, it is also found that the drain current decreases with the dipole moments. The results indicate that both devices are capable of distinguishing molecules with different dipole moments.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/17/1/012024