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[[abstract]]A macroscopic plasma display panel cell is employed to study the striation phenomenon occurring in the discharge of a much smaller commercial AC-plasma display panel (PDPs) cell. The macro-cell is designed based on the scaling law with a scaling factor of 50. The honeycomb shaped macro-cell has symmetric coplanar T-shaped electrodes and a data electrode asymmetrically placed with an offset in direction perpendicular to the cathode-to-anode direction, i.e., the data electrode is not placed on the central line of the cell. Measurement of images by an intensified charged coupled device (ICCD) camera shows that the asymmetric electric field profile due to asymmetric electrode configuration causes the development of striations along different directions on the anode. A number of striation domains (with different orientations) ap...
[[abstract]]Nuclear Engineering program was started in National Tsing Hua University more than 40 years ago, as the sole nuclear engineering department in Taiwan. It has graduated more than 3000 graduates since then. About 40% of them are still working in the nuclear fields in Taiwan and abroad. In the past ten years or so, due to the anti-nuclear environments and the current Government's policy, the enrolment of students has been very difficult. In 1997, the department decided to change to the current name to broaden the research areas into multi-discipline integrated systems including nuclear engineering as one part of the systems. Nevertheless, since the Kyoto Protocol has limited the emission of CO2 and in conjunction with the scarce and rising price of fossil fuel, the need for nuclear energy in Taiwan becomes inevitable and neces...
[[abstract]]The relations between process parameters for hydrogenated microcrystalline silicon (μc-Si:H) thin films and properties of deposited films are demonstrated in this thesis. μc-Si:H thin films are prepared by plasma-enhanced chemical vapor deposition (PECVD) with very high frequency (VHF) at 27.12 MHz. Several process parameters can influence properties of deposited films and also be studied in our results, as the hydrogen dilution ratio, the VHF-power, the pressure and the electrode gap. The glow of the plasma associated with properties of deposited films is detected by optical emission spectroscopy (OES). The spectral lines for our interest are the SiH* (412.8 nm), the Hα (656.2 nm), the Hβ (486.2 nm) and the H2 Fulcher (600-630 nm). OES measurement results are shown in the types of OES-ratios (Hα/ SiH*, Hβ/ SiH*) to analyze...
[[abstract]]近年來能源議題逐漸受到關注,而發展中的太陽能發電不但供應了源源不絕的能量且不會對地球造成汙染,使各界認為太陽能源或許能是未來的替代能源。而市面上最廣泛應用的是矽晶太陽電池,可分為兩大類: 1.塊材2.薄膜。後者矽消耗量小,相較之下可以降低成本,且沉積溫度在較低溫就可進行,可以減少浪費。一般矽薄膜太陽電池是利用非晶矽薄膜製作而成,而如果在製程氣體上加入甲烷或乙烷提供碳形成(amorphous silicon carbide a-SiC:H)薄膜,研究上顯示會形成高能隙太陽電池,在發光二極體、智慧節能窗等皆有相關應用。 a-SiCx:H薄膜中,Si-C鍵比例增高時,薄膜整體晶格無序增加使電池的光電特性下降。而如果在較低溫(150 ℃)下沉積,光暗電導還會再下降。由於太陽電池中可撓式基板逐漸受到矚目,在低溫下製程並有較高品質薄膜則顯得格外重要。因此本研究主要著重在低製程溫度(150 ℃)沉積a-SiC:H薄膜,並結合材料特性、電漿特性和光譜儀分析(Optical Emission Spectroscopy,OES)之製程參數變化尋求關聯性,獲得高光學能隙與高光敏性吸收層之薄膜,同時結合N、P層形成PIN太陽電池元件。 本實驗方法是利用27.12 MHz 的Plasma Enhanced Chemical Vapor Deposition (PECVD)沉積,同時藉由OES量測並記錄電漿中粒子的放射光強度,之後分析粒子的相對強度(如Hβ/Hα、CH/SiH*等OES-ratio)建立電漿光譜。因薄膜在低溫條件下材料品質會不太穩定,因此可以藉由OES提供一即時偵測電漿腔體穩定性外,也可利用放射光強度相對變化預測光學能隙在隨參數變化時之趨勢。研究發現,電漿放射光強度比(CH/SiH*)與薄膜光學能隙(Eg)具有相同的趨勢。所沉積的本質層薄膜具有高能隙特性,結合P、N層形成PIN單一接面太陽電池,具則有高穿透率、高開路電壓之特性,已接近電致...
[[abstract]]本論文使用COMSOL來設計和分析表面電漿波導管,並藉由計算訊號傳遞距離和模態面積來了解效能表現,再計算功率比例來驗證改良結果。 本論文提出改良的結構,以金屬置頂混合式表面電漿子波導管(metal on top surface plasmon polariton waveguide, MOP SPP WG )為基礎,藉由金屬與低介電係數層的接觸面積縮減來降低能量損耗,以達到提升訊號傳遞距離的目標,並研究其變化趨勢,找出效能最佳化的結構設計。文中主要模擬了三種不同金屬結構的表面電漿子波導管來加以分析,首先是找出主要的金屬損耗區域並加以改良,再來是進一步減少金屬尖端結構的產生,最後是降低金屬與介電質(空氣)的接觸面積。由以上這三種模擬結果可以分析出最佳化的結構設計, 而最佳化的結構設計為減少金屬與低介電係數層的接觸面積和尖端部分,其金屬結構的形狀類似一個倒立三角形,根據模擬結果可以顯示,其傳遞距離可以大幅提升,而模態面積維持不變,因為在金屬中的功率比例下降,使得損耗降低,因此提升了表面電漿子波導管的效能。這樣的結構設計在不增加體積的條件下,提升了訊號傳遞距離,對於未來光積體電路的整合有很大的幫助。
[[abstract]]In this thesis, an evolutional waveform in sustain period by combining the ramp-type sustain pulse with the auxiliary pulse on address electrode is proposed to improve the luminous efficiency in plasma display panel. The ramp-type sustain waveform is featured with the longer rise-time than the conventional waveform and it is a compromise to let gas discharge with lower cell voltage but still helps accumulate enough wall charges to sustain discharge sequence in cells. For high sustain frequency, adding an auxiliary pulse on address electrode in the early stage of ramp-type sustain pulse to induce a pre-discharge. The pre-discharge not only eliminates partial wall charges but also increases density of priming particles which help the coplanar-type discharge start at a lower cell voltage. The increase of luminous efficiency is...
[[abstract]]In this thesis, an evolutional waveform in sustain period by combining the ramp-type sustain pulse with the auxiliary pulse on address electrode is proposed to improve the luminous efficiency in plasma display panel. The ramp-type sustain waveform is featured with the longer rise-time than the conventional waveform and it is a compromise to let gas discharge with lower cell voltage but still helps accumulate enough wall charges to sustain discharge sequence in cells. For high sustain frequency, adding an auxiliary pulse on address electrode in the early stage of ramp-type sustain pulse to induce a pre-discharge. The pre-discharge not only eliminates partial wall charges but also increases density of priming particles which help the coplanar-type discharge start at a lower cell voltage. The increase of luminous efficiency is...
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