拉伸性聚芴類材料之形態控制、光電特性與應用

Abstract

穿戴式科技日新月異，新世代的有機半導體元件不僅整合醫療監測之功能，亦須能於高強度運動下，保有穩定之元件特性，為此可拉伸式半導體材料之開發備受矚目。為開發兼具高效能、環境穩定且高機械耐久性之可拉伸式有機半導體元件，主動層的半導體材料扮演至關重要的角色。相較於無機與有機小分子半導體材料，共軛高分子材料具備低生產成本、輕薄、高效能之光電性質以及潛在之薄膜延展性等優勢，更利於彈性半導體材料之發展。從材料設計方面，可經由物理性摻混或化學合成及修飾之方式，導入彈性且具有其他功能性之材料，進而透過材料相分離尺度與相形態結構之控制，提升材料之光電特性與機械強度，並且應用於各式電子元件。然而，至今為止，多數文獻所開發之彈性半導體材料皆應用在有機電晶體材料，極少數研究著墨於可拉伸式光電元件及記憶體元件。在此篇論文中，我們階段性以物理混摻與化學合成兩種方式設計與製備彈性光電材料，將具高效能藍光特性之聚芴類共軛高分子與多功能之柔性材料整合，並且有系統地探討拉伸過程對於材料相形態與光電特性之影響。研究內容分述於三個章節：第一章，我們將聚芴類共軛高分子材料以物理混摻導入橡膠，藉由材料間之物理性作用力抑制聚集形成，製備可拉伸之光電織布；第二章，我們透過化學合成技術，製備兼具高效能放光特性與彈性之嵌段共聚物材料，該材料能承載100%的拉伸形變；第三章，沿用該物理作用力，將共軛高分子材料與生物可降解之材料進行混摻，運用不同製程控制相分離維度以調控記憶體元件之特性，製備具可降解特性之可撓曲式有機記憶體元件。以上研究顯示，我們成功地展示並開發各種彈性聚芴類光電材料，這些材料於未來穿戴式電子元件之發展具有重要影響力。

The development of intrinsically deformable luminescent materials has generated increasing concern owing to their potential applications in wearable electronics. These materials with attractive benefits of lower production costs, light weight, efficient optoelectronic properties and potential film ductility are capable of maintaining good device performance under large mechanical strain. The exploration of relationships among the phase-separated structures, optoelectronic properties, and deformability provides an important insight for highly efficient, ambient stable, and mechanically durable semiconducting polymers. In this thesis, we progressively incorporate luminescent polyfluorene-based conjugated polymers with multifunctional elastomeric materials; furthermore, their strain-dependent morphologies and optoelectronic properties are systematically investigated. From these physical and chemical strategies, we successfully developed intrinsically deformable luminescent conjugated polymers with tunable structures and properties. These novel luminescent rubbery semiconductors are of great significance for future wearable optoelectronic devices.