Phetchakul, Toempong

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Preferred name
Phetchakul, Toempong
Alternative Name
Phetchakul, T.
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Email
toempong.ph@kmitl.ac.th

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    Study of Sensitivity and Noise on Magnetic FinFET (MAG-FinFET)
    (2023-01-01)
    Swe, Khine Thandar Nyunt
    ;
    Poyai, Amporn
    ;
    Phetchakul, Toempong
    Three dimensional FinFET device structure is proposed as magnetic device to detect the vertical magnetic field. The region of drain contact is split into two drain contacts and the MAG-FinFET has source contact, gate contact and two drain contacts. Lorentz's force appears as Hall effect when the magnetic field is exposed to the device perpendicularly. The imbalanced drain currents at the drain contact D1 and D2 caused by the expose of magnetic field are measured, and the Hall current is obtained as the output of MAG-FinFET. The relative sensitivities of MAG-FinFET with three channel lengths are calculated. Mixed mode AC analysis simulations are done by using Sentaurus TCAD to study the impact of noise on MAG-FinFET. The fluctuations at the output nodes of Mag-FinFET can be seen as noise voltage spectral density and noise current spectral density. The short channel length of 10 nm MAG-FinFET gives the highest differential drain current and shows the best sensitivity. The limitation of minimum magnetic field is determined from the noise current spectral density obtained at bandwidth 1 Hz to 1 kHz. For channel length 10 nm MAG-FinFET, the minimum magnetic field Bmin 76mTHz is obtained for narrow bandwidth at frequency 1 kHz. The equivalnet magnetic field Beq obtained for large frequency range is 1.28THz.
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    Novel MAGFinFET: Operation, Design and Geometry Effect for Modern Sensors
    (2022-01-01)
    Swe, Khine Thandar Nyunt
    ;
    Pamonchom, Chanvit
    ;
    Poyai, Amporn
    ;
    Phetchakul, Toempong
    This paper presents a new magnetic detection device, MAGFinFET, which is based on the advanced 3D FinFET structure. It can measure the vertical magnetic field by designing two contacts on both sides of the drain. The operation uses the principle of the current mode of Hall effect causing the deflection of the drain currents at both contacts. The 3D geometry effect was studied: channel length, fin height and fin width. It can be seen that when the values of these parameters are increased, the differential currents and relative sensitivities are increased linearly. Relative sensitivity has the highest value 0.00201 T-1 at channel length 50 nm. Fin height and fin width of 50 nm give the highest sensitivity of 0.00468 T-1 and 0.00415 T-1 respectively. Current density distributions of the different variations of each parameter Lg, Fh and Fw are observed by applying vertical magnetic field on the device. The 3D-MAGFinFET has been compared to that of the 2D non-split drain MAGFET structure and bulk fin resistor that use n-type semiconductor instead of induction channel. MAGFinFET shows quite higher sensitivity compared to bulk fin resistor. MAGFinFET mechanism models and simple characteristic equations are proposed in this work. Sentaurus TCAD is used for the device structure and simulation for the characteristics ofMAGFinFET. This FinFET based device can be fabricated with modern integrated circuit technology.