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有機電子デバイスの電荷輸送に対する薄膜形態と界面の影響の調査
https://doi.org/10.18997/00008448
https://doi.org/10.18997/00008448b3304470-9ecf-4615-bf3f-286658955f14
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
sei_k_380.pdf (7.0 MB)
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| Item type | 学位論文 = Thesis or Dissertation(1) | |||||||
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| 公開日 | 2021-09-01 | |||||||
| 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 | Exploring the Influence of thin-film morphology and interfaces on the charge transport in organic electronic devices | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 有機電子デバイスの電荷輸送に対する薄膜形態と界面の影響の調査 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Kumari, Nikita
× Kumari, Nikita
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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 organic electronics. Overall performance of organic electronic devices （OEDs） is being 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. Chapter 1 introduces the concerns related to the present state-of-art in organic electronics, problems related to thin-film fabrication techniques for SCPs, the need for a comprehensive understanding of the SCP/dielectric, SCP/metal interfaces and their implication on the charge carrier transport. The theory of electrical conduction in SCPs, their charge carriers, energy band as well as charge carrier transport, with existing thin-film fabrication techniques has been discussed in detail followed by challenges currently being faced and justification for the aim of the present research work. In chapter 2, brief outline of the SCPs like P3HT, PBTTT, PQT, their thin-film processing adopting spin-coating, drop-casting, floating film transfer, and friction transfer techniques have been provided. Various techniques used for the characterization and analysis of the oriented thin films along with the fabrication and analysis of various organic electronic devices have been discussed in detail. 3rd chapter deals with the development of a novel 2D-positional mapping technique for the swift microstructural characterization of the large area oriented thin-films aiming towards the fast optimization of experimental parameters. With this mapping technique, position-dependent polarized absorption spectra were measured at varying locations utilizing the aligned light source and multichannel photonic analyzer and XY motion-controlled mobile sample stage. The sample was scanned along multiple lines to probe changes in the absorption spectra leading to the swift analysis of the uniformity and microstructural distribution. The validity of results pertaining to the thin film uniformity and molecular orientation was successfully demonstrated using FTM fabricated thin films of PQT-C12 using the mapping system and conventional spectrophotometer. At the same time, the usefulness of this method verified using thin films of PBTTT-C14 as conjugated polymer prepared by different methods such as spin coating, friction transfer method, and FTM having different thickness range and their uniformity. Chapter 4 deals with the investigation on the effect of the interface and the thin-film morphology on in-plane and out-of-plane charge transport. To analyze the effects on vertical charge transport, organic Schottky diodes （OSDs） were fabricated with varying metal/SCP interfaces and morphology utilizing different thin-film fabrication techniques. A new generalized model was proposed for the analysis of charge transport and extraction of the device parameters. In-plane charge transport was studied by fabricating organic field transistors （OFETs）. In general, the thin film fabrication method using sheer forces, leads to face-on orientation of the macromolecules, which are although good for vertical devices but not suitable for the planer devices like OFETs. Results of in-plane GIXD and out-of-plane XRD of as-cast and annealed films of friction transferred PBTTT on HMDS treated substrate revealed the almost complete transformations from the face-on to edge-on after annealing the thin-films at about 200 ℃, which was further verified by enhanced OFET mobility. Results on the temperature and interface dependent electrical and optical characterization of OFETs utilizing friction transferred PBTTT thin-films led to the proposal of a new carrier-transport mechanism to interpret the obtained experimental results. In chapter 5, efforts were directed towards the development of the large area and environmentally benign thin film fabrication and their improvisation followed by their utilization to fabricate OEDs like OSDs, OFETs, and organic memristors. Fabrication of large area and highly oriented thin films of PBTTT was demonstrated by improvised friction transfer technique. Improvisation of the friction transfer method was done utilizing very small of the hydrophobic solvent between the polymeric pellet and the substrate. This resulted in to not only the uniform large area thin films but also the change of molecular conformation from conventional face-on to edge-on leading to highly pronounced charge carrier mobility from 0.035 cm2/Vs to 0.4 cm2/Vs. Subsequent optical characterization of the thin film revealed a highly extended polymer backbone, which was evidenced from in-plane grazing-incidence X-ray diffraction pattern. Further facile in-plane charge transport was demonstrated by fabricating OFETs, which consequently shown significant enhancement in the charge carrier mobility. Finally, chapter 6 of this thesis presents the overall conclusion of the whole work summarizing the main results along with future scopes of the work and their perspectives. | |||||||
| 言語 | en | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1: Introduction||2: Materials and Methods||3. 2D Positional Mapping for Swift Microstructural Characterization of Large Area Thin-films||4: Influence of Thin-film Morphology and Interfaces on Transport Characteristics of Organic Electronic Devices||5: Environmentally Sustainable Approaches for Fabricating Organic Electronic Devices||6: Conclusion and Future Work | |||||||
| 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380号 学位授与年月日：令和2年9月25日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | conducting polymer | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | charge transport | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | friction transfer | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | positional mapping | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Schottky diode | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | OFET | |||||||
| アドバイザー | ||||||||
| パンディ, シャム スディル | ||||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第380号 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（工学） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2020-09-25 | |||||||
| 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 | |||||||
| 学位授与年度 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 令和2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 | 10.18997/00008448 | |||||||
| ID登録タイプ | JaLC | |||||||
