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Author: search.filters.author.Pengchan, WeeraStart date: 2020

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    Optical Absorption and Bandgap Modulation in Diamond-Like Carbon Films for Anti-Reflection
    (2026-01-01)
    Srisantirut, Tanawit
    ;
    Pengchan, Weera
    ;
    Phetchakul, Toempong
    Diamond-like carbon (DLC) films were deposited onto glass and silicon substrates utilizing Electron Cyclotron Resonance Chemical Vapor Deposition (ECR-CVD) with an Argon/Acetylene gas mixture. Substrate biases were varied (0V,-55V,-100V) for both nitrogen-doped and undoped films. Optical band gap (Eg) decreased with increasing negative substrate bias specifically from 2.6 eV to 2.2 eV for nitrogen-doped DLC and from 1.6 eV to 1.3 eV for undoped DLC. Nitrogen doping generally results in films with wider band gaps compared to undoped films at equivalent biases to sp hybrid bond formation increasing bias reduces the band gap within each film type. I-V measurements revealed an increase in open-circuit voltage from approximately 0.648 V to a range of 0.678–0.698 V for cells incorporating nitrogen-doped DLC. This improvement is attributed to enhanced corrosion resistance and electrical conductivity suggesting the suitability of nitrogen-doped DLC for photovoltaic applications.
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    Three-Phase Oscillator with Cascade Ability Using Voltage Current Conveyor
    (2024-01-01)
    Buakaew, Seangrawee
    ;
    Narksarp, Wipavan
    ;
    Choeysombat, Kamonthip
    ;
    Kanjanawiwin, Juthamas
    ;
    Atiwongsangthong, Narin
    This paper presents a new circuit configuration employing voltage current conveyors (VCII) in conjunction with a minimal number of passive elements to achieve a voltage mode sinusoidal oscillator with a 3 -phase differential output. The proposed circuit features a straightforward architecture, with all passive elements connected to low-impedance nodes. Consisting solely of identical VCIIs without multiple outputs, the circuit facilitates the cascading of the 3 -phase outputs without requiring supplementary buffering. Simulation results obtained through PSPICE, along with experimental validation using commercial ICs, are provided to substantiate the efficacy of the proposed circuit.
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    Diamond-like Carbon Thin Film Coating for Application on Heterojunction Solar Cells by ECR-CVD System
    (2020-05-27)
    Srisantirut, Tanawit
    ;
    Pengchan, Weera
    ;
    Phetchakul, Toempong
    Diamond-like Carbon (DLC) film has the ability to change the refractive index value achieved high transmittance for potential applications of antireflection coating. DLC films were deposited on heterojunction solar cells by the ECR-CVD (Electron Cyclotron Resonance Chemical Vapor Deposition) method using Acetylene (C<inf>2</inf>H<inf>2</inf>) and Argon (Ar) gases. DLC coating affects ITO (Indium tin oxide), causing the electrical and resistivity of heterojunction solar cell vary according to the coating time. The surface and thickness of the DLC films was measured with an atomic force microscope. Illuminated I-V characteristic was investigated by photo-I-V measurements. The suitable acetylene anti-reflection deposition time at 0.40 minutes. Therefore, heterojunction solar cell was fabricated on a substrate using the optimized DLC films as an anti-reflection coating and it obtained an increase efficiency of about 1%.