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Ching-ting Lee - One of the best experts on this subject based on the ideXlab platform.

  • Homostructured ZnO-based metal-oxide-semiconductor field-effect transistors deposited at low temperature by vapor cooling Condensation System
    Applied Surface Science, 2015
    Co-Authors: Tzu Shun Lin, Ching-ting Lee
    Abstract:

    Abstract The vapor cooling Condensation System was designed and used to deposit homostructured ZnO-based metal-oxide-semiconductor field-effect transistors (MOSFETs) on sapphire substrates. Owing to the high quality of the deposited, various ZnO films and interfaces, the resulting MOSFETs manifested attractive characteristics, such as the low gate leakage current of 24 nA, the low average interface state density of 2.92 × 1011 cm−2 eV−1, and the complete pinch-off performance. The saturation drain–source current, the maximum transconductance, and the gate voltage swing of the resulting homostructured ZnO-based MOSFETs were 5.64 mA/mm, 1.31 mS/mm, and 3.2 V, respectively.

  • Investigation of ZnO-based ultraviolet light-emitting diodes
    Proceedings of SPIE, 2014
    Co-Authors: Ching-ting Lee, Hao Yu Chang
    Abstract:

    Recently, ZnO-based semiconductors have been deposited on various substrates using various methods. Furthermore, they were used in ultraviolet light-emitting diodes (UVLEDs) due to inherent properties including wide direct bandgap and high binding energy. In this work, two different deposition Systems were utilized to deposit the ZnO-based films. The resulted films were applied to fabricate the ZnO-based UVLEDs. Firstly, the high quality i-ZnO films were deposited as the active layer by using the vapor cooling Condensation System to enhance the internal quantum efficiency. Secondly, the double-heterostructured MgZnO/ZnO/MgZnO layers were deposited as the active layer at low temperature using the vapor cooling Condensation System to enhance light intensity. Furthermore, various component ratios of i- MgZnO and i-MgBeZnO films were deposited using a radio frequency (RF) magnetron co-sputter System. Consequently, the deposited films with various energy bandgaps were stacked alternately to form the active layer of multiple-quantum well (MQW) UVLEDs. The light emitting intensity of MQW UVLEDs was better than that of the traditional p-i-n UVLEDs. This phenomenon was attributed to the carrier confinement in well layers and improvement probability of radiative recombination.

  • Recent development and progress of ZnO-based optoelectronic devices
    2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), 2013
    Co-Authors: Ching-ting Lee, Hsin-ying Lee
    Abstract:

    Novel vapor cooling Condensation System was designed and used to grow ZnO-based thin films for fabricating optoelectronics devices with high quality. The performances of thin films, ultraviolet light-emitting diodes, and ultraviolet photodetectors were studied.

  • Performance investigation of p-i-n ZnO-based thin film homojunction ultraviolet photodetectors
    Applied Physics Letters, 2012
    Co-Authors: Tzu Shun Lin, Ching-ting Lee
    Abstract:

    The p-i-n ZnO-based ultraviolet (UV) photodetectors was deposited using the vapor cooling Condensation System. The rejection ratio between the ultraviolet and the visible was 2.82 × 103 measured at a reverse bias of −1 V. The low-frequency noise, which was dominated by the flicker noise, exhibited the noise equivalent power of 1.70 × 10−12 W and the high detectivity of 5.53 × 1011 cm Hz1/2W−1 with the illumination wavelength of 360 nm at the reverse bias voltage of −1 V. The high performances were attributed to the low defects and interface states present in the p-i-n ZnO-based ultraviolet photodetectors prepared using the vapor cooling Condensation System.

  • Enhanced light emission of double heterostructured MgZnO/ZnO/MgZnO in ultraviolet blind light-emitting diodes deposited by vapor cooling Condensation System
    Applied Physics Letters, 2012
    Co-Authors: Hsin-ying Lee, Ching-ting Lee
    Abstract:

    The MgZnO/ZnO/MgZnO double heterostructure was deposited at low temperature by a vapor cooling Condensation System to enhance the light emission of the ultraviolet p-AlGaN/i-MgZnO/i-ZnO/i-MgZnO/n-ZnO:In light-emitting diodes (ULEDs). The defect and vacancy concentrations of the deposited films were effectively reduced. The peak intensity and total emission power of the ultraviolet electroluminescence (EL) spectra of the ULEDs were 3.08 times and 1.82 times higher than those of the p-AlGaN/i-ZnO/n-ZnO:In ULEDs, respectively. Furthermore, the visible EL emission intensity induced by defect and vacancy in the ULEDs was negligible due to the high performances of the deposited active i-ZnO films.

Hsin-ying Lee - One of the best experts on this subject based on the ideXlab platform.

Kenichi Yoshikawa - One of the best experts on this subject based on the ideXlab platform.

  • how environmental solution conditions determine the compaction velocity of single dna molecules
    Nucleic Acids Research, 2012
    Co-Authors: Ken Hirano, Tomomi Ishido, Mitsuru Ishikawa, Yoshinobu Baba, Masatoshi Ichikawa, Kenichi Yoshikawa
    Abstract:

    : Understanding the mechanisms of DNA compaction is becoming increasingly important for gene therapy and nanotechnology DNA applications. The kinetics of the compaction velocity of single DNA molecules was studied using two non-protein Condensation Systems, poly(ethylene glycol) (PEG) with Mg(2+) for the polymer-salt-induced Condensation System and spermine for the polyamine Condensation System. The compaction velocities of single tandem λ-DNA molecules were measured at various PEG and spermine concentrations by video fluorescent microscopy. Single DNA molecules were observed using a molecular stretching technique in the microfluidic flow. The results show that the compaction velocity of a single DNA molecule was proportional to the PEG or spermine concentration to the power of a half. Theoretical considerations indicate that the compaction velocity is related to differences in the free energy of a single DNA molecule between the random coil and compacted states. In the compaction kinetics with PEG, acceleration of the compaction velocity occurred above the overlap concentration while considerable deceleration occurred during the coexistence state of the random coil and the compacted conformation. This study demonstrates the control factors of DNA compaction kinetics and contributes toward the understanding of the compaction mechanisms of non-protein DNA interactions as well as DNA-protein interactions in vivo.

  • how environmental solution conditions determine the compaction velocity of single dna molecules
    Nucleic Acids Research, 2012
    Co-Authors: Ken Hirano, Tomomi Ishido, Mitsuru Ishikawa, Yoshinobu Baba, Masatoshi Ichikawa, Kenichi Yoshikawa
    Abstract:

    : Understanding the mechanisms of DNA compaction is becoming increasingly important for gene therapy and nanotechnology DNA applications. The kinetics of the compaction velocity of single DNA molecules was studied using two non-protein Condensation Systems, poly(ethylene glycol) (PEG) with Mg(2+) for the polymer-salt-induced Condensation System and spermine for the polyamine Condensation System. The compaction velocities of single tandem λ-DNA molecules were measured at various PEG and spermine concentrations by video fluorescent microscopy. Single DNA molecules were observed using a molecular stretching technique in the microfluidic flow. The results show that the compaction velocity of a single DNA molecule was proportional to the PEG or spermine concentration to the power of a half. Theoretical considerations indicate that the compaction velocity is related to differences in the free energy of a single DNA molecule between the random coil and compacted states. In the compaction kinetics with PEG, acceleration of the compaction velocity occurred above the overlap concentration while considerable deceleration occurred during the coexistence state of the random coil and the compacted conformation. This study demonstrates the control factors of DNA compaction kinetics and contributes toward the understanding of the compaction mechanisms of non-protein DNA interactions as well as DNA-protein interactions in vivo.

Ken Hirano - One of the best experts on this subject based on the ideXlab platform.

  • how environmental solution conditions determine the compaction velocity of single dna molecules
    Nucleic Acids Research, 2012
    Co-Authors: Ken Hirano, Tomomi Ishido, Mitsuru Ishikawa, Yoshinobu Baba, Masatoshi Ichikawa, Kenichi Yoshikawa
    Abstract:

    : Understanding the mechanisms of DNA compaction is becoming increasingly important for gene therapy and nanotechnology DNA applications. The kinetics of the compaction velocity of single DNA molecules was studied using two non-protein Condensation Systems, poly(ethylene glycol) (PEG) with Mg(2+) for the polymer-salt-induced Condensation System and spermine for the polyamine Condensation System. The compaction velocities of single tandem λ-DNA molecules were measured at various PEG and spermine concentrations by video fluorescent microscopy. Single DNA molecules were observed using a molecular stretching technique in the microfluidic flow. The results show that the compaction velocity of a single DNA molecule was proportional to the PEG or spermine concentration to the power of a half. Theoretical considerations indicate that the compaction velocity is related to differences in the free energy of a single DNA molecule between the random coil and compacted states. In the compaction kinetics with PEG, acceleration of the compaction velocity occurred above the overlap concentration while considerable deceleration occurred during the coexistence state of the random coil and the compacted conformation. This study demonstrates the control factors of DNA compaction kinetics and contributes toward the understanding of the compaction mechanisms of non-protein DNA interactions as well as DNA-protein interactions in vivo.

  • how environmental solution conditions determine the compaction velocity of single dna molecules
    Nucleic Acids Research, 2012
    Co-Authors: Ken Hirano, Tomomi Ishido, Mitsuru Ishikawa, Yoshinobu Baba, Masatoshi Ichikawa, Kenichi Yoshikawa
    Abstract:

    : Understanding the mechanisms of DNA compaction is becoming increasingly important for gene therapy and nanotechnology DNA applications. The kinetics of the compaction velocity of single DNA molecules was studied using two non-protein Condensation Systems, poly(ethylene glycol) (PEG) with Mg(2+) for the polymer-salt-induced Condensation System and spermine for the polyamine Condensation System. The compaction velocities of single tandem λ-DNA molecules were measured at various PEG and spermine concentrations by video fluorescent microscopy. Single DNA molecules were observed using a molecular stretching technique in the microfluidic flow. The results show that the compaction velocity of a single DNA molecule was proportional to the PEG or spermine concentration to the power of a half. Theoretical considerations indicate that the compaction velocity is related to differences in the free energy of a single DNA molecule between the random coil and compacted states. In the compaction kinetics with PEG, acceleration of the compaction velocity occurred above the overlap concentration while considerable deceleration occurred during the coexistence state of the random coil and the compacted conformation. This study demonstrates the control factors of DNA compaction kinetics and contributes toward the understanding of the compaction mechanisms of non-protein DNA interactions as well as DNA-protein interactions in vivo.

Yoshinobu Baba - One of the best experts on this subject based on the ideXlab platform.

  • how environmental solution conditions determine the compaction velocity of single dna molecules
    Nucleic Acids Research, 2012
    Co-Authors: Ken Hirano, Tomomi Ishido, Mitsuru Ishikawa, Yoshinobu Baba, Masatoshi Ichikawa, Kenichi Yoshikawa
    Abstract:

    : Understanding the mechanisms of DNA compaction is becoming increasingly important for gene therapy and nanotechnology DNA applications. The kinetics of the compaction velocity of single DNA molecules was studied using two non-protein Condensation Systems, poly(ethylene glycol) (PEG) with Mg(2+) for the polymer-salt-induced Condensation System and spermine for the polyamine Condensation System. The compaction velocities of single tandem λ-DNA molecules were measured at various PEG and spermine concentrations by video fluorescent microscopy. Single DNA molecules were observed using a molecular stretching technique in the microfluidic flow. The results show that the compaction velocity of a single DNA molecule was proportional to the PEG or spermine concentration to the power of a half. Theoretical considerations indicate that the compaction velocity is related to differences in the free energy of a single DNA molecule between the random coil and compacted states. In the compaction kinetics with PEG, acceleration of the compaction velocity occurred above the overlap concentration while considerable deceleration occurred during the coexistence state of the random coil and the compacted conformation. This study demonstrates the control factors of DNA compaction kinetics and contributes toward the understanding of the compaction mechanisms of non-protein DNA interactions as well as DNA-protein interactions in vivo.

  • how environmental solution conditions determine the compaction velocity of single dna molecules
    Nucleic Acids Research, 2012
    Co-Authors: Ken Hirano, Tomomi Ishido, Mitsuru Ishikawa, Yoshinobu Baba, Masatoshi Ichikawa, Kenichi Yoshikawa
    Abstract:

    : Understanding the mechanisms of DNA compaction is becoming increasingly important for gene therapy and nanotechnology DNA applications. The kinetics of the compaction velocity of single DNA molecules was studied using two non-protein Condensation Systems, poly(ethylene glycol) (PEG) with Mg(2+) for the polymer-salt-induced Condensation System and spermine for the polyamine Condensation System. The compaction velocities of single tandem λ-DNA molecules were measured at various PEG and spermine concentrations by video fluorescent microscopy. Single DNA molecules were observed using a molecular stretching technique in the microfluidic flow. The results show that the compaction velocity of a single DNA molecule was proportional to the PEG or spermine concentration to the power of a half. Theoretical considerations indicate that the compaction velocity is related to differences in the free energy of a single DNA molecule between the random coil and compacted states. In the compaction kinetics with PEG, acceleration of the compaction velocity occurred above the overlap concentration while considerable deceleration occurred during the coexistence state of the random coil and the compacted conformation. This study demonstrates the control factors of DNA compaction kinetics and contributes toward the understanding of the compaction mechanisms of non-protein DNA interactions as well as DNA-protein interactions in vivo.