光感式快閃有機場效電晶體式記憶體之設計與光恢復行為之研究

Abstract

近年來，隨著科技的發展帶動了記憶體快速地成長，相較於傳統的無機材料記憶體，有機記憶體符合了人們對於記憶體低成本、可撓性、高密度的儲存量的需求， 而在眾多有機記憶體當中，就屬有機場效電晶體式記憶體最受到矚目。本研究分成四大部分，在第一章是總體緒論，簡述各種類的有機記憶體以及光感式整合記憶體，其中著重在於有機場效電晶體式記憶體的介紹，尤以駐極體層。在第一章末概論光感式記憶體現今發展以及發展策略。第二章中，首次以光感式的高分子（Poly CD） 為駐極體之電晶體式記憶體發展出具有光恢復行為的光感式快閃記憶體。其中做為駐極體層的Poly CD 具有平面化共軛的施體－受體單元結構。此外，在本章節中，亦針對光恢復提出機制，並探討此行為與化學結構上的關聯。最後，以光記錄器做為應用及性能上的展示。為了更進一步地探討化學結構對光感式記憶體的性能影響，在第三章，採用了兩種在結構上可比較的含咔唑之共聚物，二者在結構上具有無電子受體的差異。從實驗結果顯示，共軛性及電子施體－受體結構的含咔唑之共聚物具有更靈敏的光反應性以及能達到高密度儲存記憶體之應用。第四章為結論。根據第二章、第三章實驗結果，得知具有施體－受體單元以及平面化共軛結構之駐極體有利於激子的分離以及異域化，可促使光恢復行為現象發生。此外，具有施體－受體單元之駐極體能達到雙極性的行為，實現高儲存密度的記憶體應用。

In recent years, memory devices have grown rapidly with the development of electronics. In contrast to conventional inorganic memory devices, organic memory devices meet the demands of processability, low-cost, flexibility, and realize the high-density storage. Among them, the memories with OFET construction have drawn great of attentions. The study comprises four parts. Following a general introduction contains the organic memory devices, and novel type memory devices integrated with light sensing function. Among the organic memory devices, the study focuses on the organic field-effect transistor memory devices, and put emphasis on the electret layer. As for the photo-transistor memory, in the end of Chapter 1 provides an overview of the present development and strategies for photo-responsive memory. Chapter 2 presents a promising photo-responsive polymer material, Poly CD, with the conjugated, coplanar and donor-acceptor units for electrets layer uses, debuting photo-recovery behavior for polymer electret. In addition, the photo-recovery behavior mechanism and the discussion of relationships regarding to chemical structure have been proposed. The performances to photo-recorder application were included at the end of Chapter 2. To further investigate the effect of chemically structural design on the performance of photo-responsive memory, two comparative carbazole-based copolymers, composed with and without acceptor group, were prepared. Based on the experimental results, they indicated considerably different photo response properties, and suggested that the one with conjugated, donor-acceptor containing structure is much suitable for the applications to high-density storage memory and photo-recorder. Finally, Chapter 4 is the total conclusion of the study. According to the experimental results in Chapter 2 and Chapter 3, the donor-acceptor moieties in the chemical structure and the conjugated parts were beneficial to the excitons dissociation and delocalization, which could promote the phenomenon of photo-induced recovery. In addition, the electrets with donor-acceptor structure could achieve the ambipolar memory behavior, realizing the high-density storage memory application.