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Sensor behavior of MoS(2) field-effect transistor with light injection toward chemical recognition

The application of field-effect transistor (FET) devices with atomically thin channels as sensors has attracted significant attention, where the adsorption of atoms/molecules on the channels can be detected by the change in the properties of FET. Thus, to further enhance the chemical sensitivity of...

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Detalles Bibliográficos
Autores principales: Alam, Md Iftekharul, Takaoka, Tsuyoshi, Waizumi, Hiroki, Tanaka, Yudai, Al Mamun, Muhammad Shamim, Ando, Atsushi, Komeda, Tadahiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9037302/
https://www.ncbi.nlm.nih.gov/pubmed/35479991
http://dx.doi.org/10.1039/d1ra03698j
Descripción
Sumario:The application of field-effect transistor (FET) devices with atomically thin channels as sensors has attracted significant attention, where the adsorption of atoms/molecules on the channels can be detected by the change in the properties of FET. Thus, to further enhance the chemical sensitivity of FETs, we developed a method to distinguish the chemical properties of adsorbates from the electric behavior of FET devices. Herein, we explored the variation in the FET properties of an MoS(2)-FET upon visible light injection and the effect of molecule adsorption for chemical recognition. By injecting light, the drain current (I(d)) increased from the light-off state, which is defined as (ΔI(d))(ph). We examined this effect using CuPc molecules deposited on the channel. The (ΔI(d))(ph)vs. wavelength continuous spectrum in the visible region showed a peak at the energy for the excitation from the highest occupied orbital (HOMO) to the molecule-induced state (MIS). The energy position and the intensity of this feature showed a sensitive variation with the adsorption of the CuPc molecule and are in good agreement with previously reported photo-absorption spectroscopy data, indicating that this technique can be employed for chemical recognition.