Detection of organic compounds based on surface photovoltage inversion of functionalized silicon nanowires

This study aims to provide a qualitative understanding of organic surface modification's effect on silicon nanowires' charge transport mechanisms. The effects of surface binding have been characterized using complementary techniques. Fourier transform infrared spectroscopy (FTIR) is a powe...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2023-07, Vol.129 (7), Article 482
Main Authors: Ennejah, N., Bouzitoun, M., A.Hajjaji, Aouida, S., Bessais, B.
Format: Article
Language:English
Subjects:
Adsorption
Applied physics
Characterization and Evaluation of Materials
Charge efficiency
Charge transfer
Charge transport
Condensed Matter Physics
Fourier transforms
Hall effect
Machines
Manufacturing
Materials science
Nanotechnology
Nanowires
Optical and Electronic Materials
Ozone
Physics
Physics and Astronomy
Processes
Sensors
Silicon
Surface chemistry
Surfaces and Interfaces
Thin Films
Transport properties
VOCs
Volatile organic compounds
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Summary:This study aims to provide a qualitative understanding of organic surface modification's effect on silicon nanowires' charge transport mechanisms. The effects of surface binding have been characterized using complementary techniques. Fourier transform infrared spectroscopy (FTIR) is a powerful protocol to study the functionalization of hydrogen-terminated boron-doped SiNWs with 3-amino propyl triethoxy silane (APTES), resulting in amino-terminated SiNWs. Surface photovoltage (SPV) correlated with Hall effect measurements shows that functionalized SiNWs recognize volatile organic compounds (VOCs) with appreciable sensitivity by changing the conductivity type from p to n. SPV exhibits a conductivity inversion phenomenon during VOC adsorption, generated by surface states, appropriate behaviour for transport properties. The analysis of the measurements led to significant results through the modulation of the surface potential and the inversion of the conductivity during the adsorption of VOCs, which improve the efficiency of charge transfer between the sensors based on SiNWs and VOC targets, providing a powerful approach for sensing applications. SPV results open a new opportunity of application for diagnosing the performance of SiNWs-based sensors.
ISSN:0947-8396
1432-0630
1432-0630
DOI:10.1007/s00339-023-06765-0