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有機電子デバイスの性能を向上させるための半導体ポリマーの配向および界面工学に関する研究
https://doi.org/10.18997/0002001058
https://doi.org/10.18997/0002001058adc368d1-c7c3-40d0-930d-75faa5d804b7
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
sei_k_499.pdf (4 MB)
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| アイテムタイプ | 学位論文 = Thesis or Dissertation(1) | |||||||
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| 公開日 | 2024-11-21 | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| タイトル | ||||||||
| タイトル | Investigation of Orientation and interface engineering of semiconducting polymers to enhance the performance of organic electronic devices | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 有機電子デバイスの性能を向上させるための半導体ポリマーの配向および界面工学に関する研究 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | jpn | |||||||
| 著者 |
Shubham, Sharma
× Shubham, Sharma
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Semiconducting polymers (SCPs) have gained huge scientific interests owing to their excellent optical, electrical, and mechanical properties making them a potential candidate for the practical realization of organic electronics. Overall performance of organic electronic devices is controlled by the nature of the SCPs, their thin-film morphology, and related interfaces. Charge transport in SCPs thin films is dictated by various phenomena like transport along π-conjugated backbone followed by intermolecular as well as inter-domain hopping. In the recent past, huge efforts have been directed to improve the crystallinity of SCP thin-films by chemical structure engineering, developing various thin-film fabrication techniques, imparting molecular orientation and post-processing of the thin films aiming towards enhancing the charge carrier transport. Existing issues of thin-film fabrications such as the use of toxic halogenated solvents, difficulty in multilayer film fabrication, and swift characterization of large area thin films are still the stumbling blocks towards the large area implementation of the OEDs. The thesis "Investigation of orientation and interface engineering of semiconducting polymers to enhance the performance of organic electronic devices" investigates the profound impact of molecular conformation, orientation, aggregation, and crystallinity on the charge transport properties and device performance of organic field-effect transistors (OFETs), organic Schottky diodes (OSDs), and organic memristors. Chapter 1 introduces the concept of solution-processable semiconductor polymers and discusses the significance of macromolecular conformation, orientation, aggregation, and crystallinity in semiconductor polymer films. It also provides an overview of three types of organic electronic devices: OFETs, OSDs, and organic memristors. Chapter 2 delves into the influence of molecular conformation on charge transport properties and device performance. By employing two widely studied SCPs, RR-P3HT and PTB7, the chapter demonstrates how careful selection of deposition techniques can control and tailor the molecular conformation. The Floating Film Transfer Method (FTM) enabled the alignment of RR-P3HT in an edge-on conformation, favoring charge transport in OFETs and organic memristors. Conversely, spin-coated RR-P3HT exhibited a mixed edge-on/face-on conformation, beneficial for out-of-plane charge transport in OSDs. The chapter also investigates the charge transport mechanism within organic memristors, proposing a model involving the splitting of energy bands and resonant tunneling of electrons facilitated by Al-AlOx nanoclusters. Chapter 3 explores the significance of SCP orientation in organic semiconductor thin films. By employing FTM and polarized absorption spectroscopy, the chapter reveals striking differences in optical and morphological properties, as well as charge transport characteristics, between regioregular (RR-P3HT) and non-regioregular (NR-P3HT) poly(3-hexylthiophene) thin films. The optical characterization unveils the influence of molecular orientation on absorption spectra, while atomic force microscopy (AFM) studies provide insights into surface morphology. The fabrication and characterization of OFETs based on these oriented thin films further elucidate the impact of molecular orientation on device performance, with NR-P3HT FTM films exhibiting significantly higher electrical anisotropy compared to RR-P3HT counterparts. Chapter 4 investigates the role of molecular aggregation in organic electronic devices, focusing on the polymer DPPT-TT. The research establishes a strong correlation between the viscosity ratio of the polymer ink and the sub-phase fluid, and the resulting orientation of polymer chains within self-assembled thin films. The study reveals that the dipole moment of the conjugated polymer monomers plays a crucial role in determining their self-assembly behavior and ink viscosity, consequently influencing the orientation of polymer chains. The impact of aggregation-induced orientation on the electrical properties of thin films is explored through the fabrication and characterization of OFETs, demonstrating exceptional charge carrier mobilities and remarkable shelf-life stability when the channel is aligned parallel to the film spreading direction. In summary, the thesis provides a comprehensive understanding of the intricate interplay between molecular conformation, orientation, aggregation, and crystallinity, and their profound impact on the optoelectronic properties and device performance of organic electronics. The insights gained from this research open up promising avenues for the development of logic circuits, neuromorphic devices, vertical CMOS circuits, and flexible/stretchable organic electronic devices by leveraging the unique properties of oriented and engineered semiconductor polymer films. |
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| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1 Introduction| 2 Role of Orientation in Organic Electronic Devices| 3 Role of Molecular Conformation in Organic Electronic Devices| 4 Role of Aggregation in Organic Electronic Devices| 5 General Conclusion and Future Prospects | |||||||
| 備考 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 九州工業大学博士学位論文 学位記番号:生工博甲第499号 学位授与年月日:令和6年9月25日 | |||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第499号 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（学術） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2024-09-25 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 17104 | |||||||
| 学位授与機関名 | 九州工業大学 | |||||||
| 言語 | ja | |||||||
| 学位授与年度 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 令和6年度 | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| ID登録 | ||||||||
| ID登録 | 10.18997/0002001058 | |||||||
| ID登録タイプ | JaLC | |||||||
