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大面積リボン状浮遊膜の分子配向制御による共役高分子系有機FETにおける異方性電荷輸送の検討
https://doi.org/10.18997/00007404
https://doi.org/10.18997/000074048a003344-4364-4dbe-ad7f-c93cd20115ac
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
sei_k_335.pdf (3.3 MB)
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| Item type | 学位論文 = Thesis or Dissertation(1) | |||||||
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| 公開日 | 2019-09-30 | |||||||
| 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 anisotropic charge transport in conjugated polymer based organic FETs by controlling the molecular orientation in large area ribbon-shaped floating films | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 大面積リボン状浮遊膜の分子配向制御による共役高分子系有機FETにおける異方性電荷輸送の検討 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Tripathi, Atul Shankar Mani
× Tripathi, Atul Shankar Mani
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Conjugated polymers （CPs） have emerged as one of the potential candidates as active semiconducting elements in organic electronics owing to their low cost device fabrication in the area of organic field effect transistors, organic light emitting diodes and solar cells etc. The main feature of this class material lies in the preparation of the thin film via facile solution processing. CPs are susceptible to anisotropic charge transport owing to their inherent one-dimensional nature. In order to delineate optical anisotropy and anisotropic charge transport various techniques for molecular alignment of CPs have been attempted in the recent past. Existing problems like mechanical damage, solubility of under-layer and difficulty in multilayer film fabrication during molecular alignments needs the development of suitable methods. To circumvent these issues, floating film transfer method （FTM） having capability of anisotropic thin film fabrication have been proposed in the recent past. Although in the proposed FTM oriented films could be easily obtained, most commonly observed circular orientation hinders further upscaling of this method for the large area applications. In this thesis, a new improvisation for unidirectional film spreading during FTM have been made by implementing a newly designed PTFE slider leading to ribbon-shaped floating films and named as Ribbon-shaped FTM. A number of most widely used CPs such as PQT-C12, F8T2, non-regiocontrolled （NR） P3HT, PBTTT-C14, PTB7 and regioregular （RR） P3ATs etc. have been successfully oriented using ribbon-shaped FTM. These oriented films have been characterized by a number of techniques like polarized electronic absorption spectroscopy, atomic force microscopy, X-ray diffraction. Parametric optimization for film casting conditions such as viscosity/temperature of the liquid substrate, temperature and concentration polymer solution were amicably carried out. Influence of these casting conditions on the nature of ribbon-shaped FTM in terms of extent of macroscopic film formation, variation on the optical anisotropy and film thickness were investigated in detail. Amongst several CPs used for investigation, PQT-C12 exhibited not only the optical anisotropy but also the pronounced anisotropic charge transport with highest charge carrier mobility for OFETs based on oriented CPs. PQT-C12 was utilized for in-depth investigation pertaining to the implication molecular weight and its distribution on the optoelectronic anisotropies by synthetizing polymers with different molecular weight and polydispersity index （PDI）. It has been found too high or low molecular weights or not favorable for promoting molecular orientation and relatively smaller PDI promotes the facile anisotropic charge transport. One of the batch of synthesized PQT-C12 and large area thin film by ribbon-shape FTM exhibited remarkably high optical anisotropy （DR?22） under at optimized casting condition. Microstructural investigation of these highly oriented films as probed by in plane GIXD exhibited edge-on orientation for the films fabricated under ambient conditions. A clear dependence of extent of molecular orientation on charge carrier mobility and anisotropic charge transport was demonstrated. Intractability of polythiophene led to development of RR-poly（3-alkylthiophene） derivatives but drastic decrease （4-5 orders） in mobility as function increasing alkyl chain length and enforced maximum research on hexyl substituted derivative （P3HT）. Efforts were directed to prepare large area oriented thin films of RR-P3ATs by ribbon shaped FTM and influence of molecular orientation on alkyl chain length was investigated. A decease in DR with increasing alkyl chain length substitution was explained by increasing extent of interdigitating alkyl chains as confirmed by XRD results. Moreover, drastic hampering of charge carrier mobility as function of alkyl chain was not observed for FTM oriented films, which was explained by edge-on orientation as evidenced by in-plane GIXD investigations. | |||||||
| 言語 | en | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1 Introduction||2 Experimental||3 Ribbon-shaped FTM: parametric optimizations||4 Charge transport in poly（quarterthiophene）: Implication of optical anisotropy and molecular weight||5 Optoelectronic properties of conjugated polymers prepared by ribbon-shaped FTM||6 Orientation and anomalous charge transport in regioregular poly （3-alkylthiophenes）||7 General 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335号 学位授与年月日：平成31年3月25日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Floating film transfer | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Conjugated polymers | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Molecular orientation | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Field-effect transistors | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Optoelectrical anisotropy | |||||||
| 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335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 | 2019-03-25 | |||||||
| 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 | 平成30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 | 10.18997/00007404 | |||||||
| ID登録タイプ | JaLC | |||||||
