Antenna Effect in Large Area Palladium-Coated Electrostatically Formed Silicon Nanowire for Ppb Level Hydrogen Sensing

Idan ShemTov*, Anwesha Mukherjee, Zoe Musafi, Evgeny Pikhay, Doron Greental, Yakov Roizin, Yarden Mazor, Yossi Rosenwaks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

An electrostatically formed nanowire (EFN) with an electrostatically formed channel is a highly sensitive and selective sensor for detecting various gases and volatile organic compounds. We report here on a specially designed large-area sensing antenna EFN that improves the response of the conventional EFN by several orders of magnitude, thus allowing the sensing of very low analyte concentrations. We have fabricated an EFN with a large area (∼3500 μm2) palladium sensing layer and show that its response in a dry air atmosphere to 30 ppb H2 is ∼90% at 60 °C. We show that this unprecedented sensitivity is due to the antenna effect, which causes the charged H2 species to drift to the region right above the EFN transistor channel. Electrostatic modeling shows good agreement with the measured antenna effect and predicts that this design paves the way to an ultrasensitive very-large-scale integration (VLSI) based gas sensing platform.

Original languageEnglish
Pages (from-to)3610-3616
Number of pages7
JournalACS Applied Electronic Materials
Volume6
Issue number5
DOIs
StatePublished - 28 May 2024

Funding

FundersFunder number
Israel Innovation Authority
Office of Naval ResearchN000141912010
Office of Naval Research

    Keywords

    • CMOS compatible sensors
    • antenna effect
    • electrostatically formed nanowire
    • gas sensors
    • hydrogen sensing
    • ppb detection

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