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Author: search.filters.author.Srisantirut, TanawitStart 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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    Development of Hetero-Junction Cells with a DLC Film Anti-reflection Layer
    (2024-01-01)
    Srisantirut, Tanawit
    ;
    Phetchakul, Toempong
    Diamond-like carbon (DLC) films were synthesized on glass slides and heterojunction cells by ECR-CVD (Electron-Cyclotron Resonance Plasma-Enhanced Chemical-Vapor Deposition) method using acetylene (C<inf>2</inf>H<inf>2</inf>), nitrogen (N<inf>2</inf>) gases and substate bias at 0,50,100 V. We investigate the effects of varying substrate bias on the characteristics of DLC film and its optical properties. Their characteristics were analyzed using the Raman technique the D and G peaks at approximately 1356 ± 5 cm<sup>−1</sup> and 1578 ± 5 cm<sup>−1</sup> respectively. The film's surface was examined using AFM imaging. Films with increased substrate biasing tend to exhibit a smoother surface. The film thickness varies depending on substrate biasing and nitrogen doping. The best light transmission was observed in films without substrate biasing. Analysis of the IV characteristics in experimental heterojunction cells revealed that cells with synthesized DLC films showed an efficiency increase from 0.74% to 0.78%. For cells doped with nitrogen, the efficiency rose from 0.74% to 0.79%. The DLC film has hydrogen bonding that can help enhance the efficiency of ITO.
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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%.