研究生: |
游智傑 Chih-Chieh Yu |
---|---|
論文名稱: |
透明電極與聚偏二氟乙烯添加鋯鈦酸鉛奈米陶瓷於可撓性元件之研究 Electric properties of transparent flexible electronics using TCO electrode and PZT nano powder modified PVDF films |
指導教授: |
周振嘉
Chen-Chia Chou |
口試委員: |
潘漢昌
Han-Chang Pan 周賢鎧 Shyan-kay Jou |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 97 |
中文關鍵詞: | 薄膜 、鋯鈦酸鉛 、聚偏二氟乙烯 、鐵電 |
外文關鍵詞: | thin film, PZT, PVDF, ferroelectric |
相關次數: | 點閱:204 下載:6 |
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近年可撓式以及透明之感測元件應用越來越廣,因此,本研究以透明導電薄膜AZO,搭配PVDF鐵電高分子披覆之PET可撓式基板,製作可撓式透明感測元件,並研究其鐵電、壓電、介電及可見光穿透性。
本研究利用雙靶材共濺鍍系統,成功鍍製AZO薄膜,並於研究中發現AZO薄膜中,Al3+離子之濃度為2 wt%時,可得電阻率最低之薄膜,本文並研究基板溫度及工作壓力對薄膜之結晶性與表面微觀結構之影響,當基板溫度達500 ℃時,因濺鍍出之物種帶有較高能量,有利於雜質佔據晶格位置,已貢獻更多電荷載子,因此電阻率可達1×10-3 Ω-cm,且工作壓力2×10-3 Torr時,因氣体平均自由路徑較長,降低物種與氣體分子之碰撞機率,使物種帶有更大動能並撞擊薄膜表面,將不致密之顆粒撞擊脫付,結晶度提升使室溫下鍍製之AZO薄膜,電阻率為5×10-3Ω-cm。
因高分子之分子鏈於薄膜中糾結,造成偶極矩轉向不易而降低鐵電、壓電及介電等特性,因此本文利用二氧化碳雷射低溫退火處理,將PVDF薄膜表面瞬間熔融再固化結晶,以提高PVDF之結晶性,量測結果顯示,隨雷射退火能量密度提高,薄膜結晶性也相對提升,使鐵電特性提升,但薄膜微觀結構形成為孔洞之多孔性結構,使漏電流特性下降至2×10-6 A/cm2,不利於元件應用。
為改善元件特性,學者以固態氧化物法製作PZT粉末並添加入PVDF溶液中,鍍製薄帶(tape),結果顯示其鐵電特性及介電特性提升,但因粒徑大,造成表面粗糙度不佳以及厚度較厚,因此,本文以溶膠凝膠法(Sol-Gel Method)配製PZT先驅溶液再以後處理製程製做粒徑為50~100 nm之奈米粉末,達成降低膜厚及表面粗糙度佳之薄膜,研究結果顯示,當PZT添加量為20 wt%時,鐵電特性達15 μC/cm2,介電常數達1450,但極化後之薄膜仍量測不出壓電特性,其原因為PVDF與PZT具有差異大之聲阻抗,造成波動能量於0-3連結之膜中傳遞時損失,為改善此現象,應從結構或極化方式進行,如將連結方式改為1-3。本文以改良式極化手法-液態極化製程,對PVDF進行極化,研究結果顯示,膜之結晶性提升,使鐵電與壓電特性獲得改良,在未添加PZT奈米粉之膜所測得之鐵電特性達15 μC/cm2,交流阻抗分析測得之Kp達0.2,本文並利用SEM觀察其液態極化製程提升PVDF結晶性之機構,發現其析出之初期具有短程方向性,為纖維狀之結構,當厚度增加後,膜之表面仍可觀察到針尖狀結晶,因此,結晶性提升造成鐵電及壓電特性提升。
In recent years, the flexible electronics and transparent devices were highly expected to be used in broad applications.
In this thesis, co-sputtering technique was applied to prepare AZO thin films successfully. As the concentration of Al3+ in AZO films was 2 wt%, the lowest point of resisvitity was achieved. In this research, substrate heating technique and modification of working pressure were investigated as well. As substrate temperature was raised to 500 ℃, the higher energy of sputtered species made more impurities migrated and occupied the lattice sites which contributed the charge carriers in the films, and the resistivity of AZO films was improved to be 1×10-3 Ω-cm. In order to deposit AZO films in room temperature, the working pressure was modified and discovered that as higher mean free path of working phenomenon in chamber, the sputtered species collided the films surface with higher energy and desorbed the un-wanted particles of films, at the meanwhile, the crystallinity of films were improved that the resistivity as low as 5×10-3 Ω-cm was achieved.
In this research, PVDF ferroelectric polymer, AZO transparent conductive electrode and PET flexible substrate were used to demonstrate the prototype of flexible and transparent device and the ferro-, piezo-, dielectric and transmittance properties were studied. The polymer chains in thin films were twisted and caused the dipoles on chains locked when switching, therefore, the ferro-, piezo-, and dielectric properties were deteriorated. To resolve this phenomenon, CO2 laser annealing technique was applied to melt and recrystallized the films in short time period. From the results, the remnant polarization enhanced as the crystallinity of PVDF improved, but electric property of leakage current deteriorated because micro pores formed in microstructure of PVDF films. In order to increase the polarization directions in films and improve the electric properties, the nano sized PZT powder was prepared by using PZT sol-gel precursor and added into PVDF films, from the results, Pr value and dielectric properties were improved to 15 μC/cm2 and 1450, respectively. Because of the difference in acoustic wave impedance of PZT and PVDF, the acoustic wave energy lost when transferring from one to another and caused very weak piezoelectric properties. In this thesis, the liquid state poling process was applied to pole the PVDF, and the Kp value and ferroelectric property was improved to 0.2 and 15 μC/cm2, respectively. To realize the mechanism of liquid state poling process, SEM investigation was adopted, as a result, the fiber-like and short-range ordered microstructure formed which improved the crystallinity of PVDF films, therefore the ferro- and piezoelectric properties were highly enhanced.
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