酞菁鈦氧/樹脂複合材料光電性能之研究

The study of optoelectronic properties of titanyl phthalocyanine/polymer composite

吳挺睿(Ting-Jui Wu)

指導教授 ： 陳奕君

國立臺灣大學/電機資訊學院/光電工程學研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.10898

摘要

本論文主要研究酞菁鈦氧/樹脂感光複合材料之光電特性，藉由調變複合材料中樹脂、酞菁鈦氧顆粒、電子傳輸材料及電洞傳輸材料的成分比例，使所製備之光電導薄膜與聚偏二氟乙烯(PVDF)壓電薄膜匹配。並以微機電技術結合兩者製作光壓電薄膜微致動器並實際應用於微流體幫浦中。
在本實驗中我們選擇兩種樹脂，分別是聚碳酸酯以及聚乙烯醇縮丁醛。在實驗中，我們發現當酞菁鈦氧於複合材料前驅溶液中的重量百分比增加時，所製備之光電導薄膜的光電阻及暗電阻同時降低。但由於酞菁鈦氧/聚碳酸酯與PVDF壓電薄膜的附著性不佳，影響元件的壽命及效率，因此所製作的元件效能不佳。而在酞菁鈦氧/聚乙烯醇縮丁醛的複合材料上，我們分別以「感光鼓結構」與「透明導電膜/複合材料/金屬三明治結構」來研究其電氣行為。我們發現當酞菁鈦氧/聚乙烯醇縮丁醛薄膜在充放電後，因大量殘餘電荷累積導致電荷釋放時間長與感光效果劣化，藉由電子傳輸材料以及電洞傳輸材料的添加，可有效改善電荷在酞菁鈦氧/聚乙烯醇縮丁醛複合材料中的累積，使其感光效果及其穩定性提升。在酞菁鈦氧晶型方面，由於晶型會影響顆粒大小及其於製程中的分散性，一般而言，Y型酞菁鈦氧/聚乙烯醇縮丁醛複合材料的光、暗電阻均大於α型酞菁鈦氧/聚乙烯醇縮丁醛複合材料，但α型酞菁鈦氧/聚乙烯醇縮丁醛複合薄膜卻又因α型酞菁鈦氧顆粒過大及不易分散等特性容易造成短路現象。因此我們藉由提高Y型酞菁鈦氧顆粒的重量百分濃度及外加偏壓來改善載子的平均自由徑，進而降低Y型的酞菁鈦氧/樹脂複合材料的光電阻，使Y型酞菁鈦氧/樹脂複合材料達到較α型酞菁鈦氧/樹脂複合材料佳的感光效果。本研究最後選用摻雜電子及電洞傳輸材料且酞菁鈦氧重量百分濃度為50%的Y型酞菁鈦氧/聚乙烯醇縮丁醛複合材料製作光壓電薄膜微致動器，並整合微流道開發出光壓電微幫浦系統。

關鍵字

酞菁鈦氧

並列摘要

The study of optoelectronic properties of titanyl phthalocyanine(TiOPc)/polymer composite is presented in this thesis. By adjusting the weight percentages of titanyl phthalocyanine, polymer, electron transport material and hole transport material in the composite, photoconductive films based on TiOPc/polymer compositeswere used in conjunction with piezoelectric thin films, Polyvinylidene Fluoride(PVDF), todevelop light-activated opto-piezoelectric thin films. These opto-piezoelectric thin films were then applied to demonstrate microfluidics pumps.
Two types of TiOPc, α-TiOPc and Y-TiOPc, and two polymers, polycarbonate(PC) and polyvinyl butyral(PVB), were investigated in this study. With the increase of the weight percentage of TiOPc in the composite, both the dark and photo resistivities decreased. Due to the poor adhesion of TiOPc/PCcomposite to the PVDF piezoelectric thin film, the performance of the microfluidic system is unsatisfied. We then focus on investigating the optoelectronics properties of TiOPc/PVB composite through two configurations, organic photoconductive drum(OPC) structure and transparent conducting oxide/photoconductive composite/metal sandwich structure. After charging and dischargingTiOPc/PVB composite thin films, the residual charges in the filmsdeteriorate theirphoto responses. With the addition of electron and hole transport materials, the residual charges in the film can be removed easily and the optoelectronic performance and stability of the composite films improve. Due to the influence of the crystal structure on the particle size and the degree of dispersion, the dark and photo resistivities of Y-TiOPc/PVB compositesare usually larger than those of α-TiOPc/PVB composites. However, α-TiOPc/PVB composite thin filmoften suffer from electrical breakdownbecause of the large α-TiOPc crystal size and aggregation of theα-TiOPc crystals.To mitigate this problem, the photosensitivity of Y-TiOPc/PVB composite is improved by raising the weight percentage of Y-TiOPc and/or increasing the applied electrical bias. Finally,Y-TiOPc/PVB composite thin films containing 50% weight percent of Y-TiOPc with the addition of electron and hole transport materials weredeveloped to fabricate light-activated opto-piezoelectric thin filmsfor the microfluidic pumps.

並列關鍵字

TiOPc

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