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アイテム
新規ドナーアクセプター型導電性高分子の配向と電荷輸送の異方性に及ぼす影響の検討
https://doi.org/10.18997/0002000078
https://doi.org/10.18997/0002000078fdd7402f-53df-4c91-8b6a-d7df8144c84c
| 名前 / ファイル | ライセンス | アクション |
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sei_k_455.pdf (2.9 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 | 2023-09-01 | |||||||
| 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 | Investigation of orienting novel donor-acceptor type conjugated copolymers and their influence on anisotropic charge transport | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 新規ドナーアクセプター型導電性高分子の配向と電荷輸送の異方性に及ぼす影響の検討 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Desu, Moulika
× Desu, Moulika
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Solution Processable conjugated polymers (CPs), especially donor-acceptor(DA) type of co-polymers have gained huge attention because of their rigid polymeric backbone, very high structural diversity for molecular design, possibility of imparting p-type, n-type and ambipolar charge transport by subtle molecular design and highly facile charge carrier transport. At the same time, imparting molecular alignment and controlling the nature and directionality of molecular orientation in the fabricated thin films are highly desired for controlling and improving the performance or organic electronic devices. In spite of fast pace development DA type conjugated polymers leading charge carrier transport surpassing amorphous silicon, there are sparse report on facile fabrication of large area and oriented thin films and their implementation for the fabrication of organic electronic device elements. Present research focuses on not only design of novel DA type conjugated polymers and understanding their structure-property relationship but also fabrication their large area and oriented thin films and utilization of such films for investigation of their anisotropic charge carrier transport by fabricating organic field-effect transistors (OFETs). Chapter 1 introduces need and importance organic electronics utilizing solution processable organic semiconductors and problems being faced pertaining to the fabrication of oriented thin films. The concept of imparting electrical conductivity in semiconductive polymers and mechanism of charge carrier transport has also been discussed in detail. The need and importance of conjugated polymers in general; and DA type conjugated copolymers in particular for their suitability as active semiconducting device elements has been highlighted. Finally, challenges being faced in fabricating large area oriented thin films followed by justification for aim of present research and organization of the thesis has been outlined. Chapter 2 deals with details of materials and methods such as various DA type CPs used for present research and techniques used fabrication and characterization of oriented and non-oriented thin films. Fabrication of OFETs and their electrical characterization for investigation of anisotropic charge transport have also been discussed in detail in this chapter. Chapter 3 presents utilization of DPP -TTT, which is widely used DA type copolymer as solution processable CP for the fabrication of non-oriented isotropic and oriented anisotropic thin films by spin coating and ribbon shaped floating film transfer method (FTM), respectively. It has been demonstrated that FTM not only give uniform and large area oriented thin films but also, they possess edge-on orientation in the fabricated thin films, which is desired for in-plane charge transport. At the same time, utilization of such oriented thin film as organic semiconducting element for OFET fabrication, there was an order of magnitude enhancement in the charge carrier mobility as compared to the non-oriented spin-coated device counterparts. Chapter 4 deals with design and development of novel conjugated DA copolymers based DPP based donor extended π-conjugated accepters based on fused aromatic heterocyclic rings. It has demonstrated that in spite of increased π-conjugation of accepter, there was a decrease in the optical band gap owing to the twisting in the polymeric backbone leading non-planarity. Using newly designed DA copolymer DPP-BZC, large area (>40 cm2) uniform and oriented thin film were fabricated by FTM. Effect of various surface modifiers such as HMDS, OTS and CYTOP on extent of orientation in the fabricated thin films were systematically investigated. Results on the implications of surface modifications revealed that use of CYTOP demonstrated the best device performance with the highest carrier mobility of 2.7 x 10-2 cm2/Vs, which was >30 times higher as compared to that of its non-oriented spin-coated device counterparts. Chapter 5 of this thesis deals with the design of novel DA type conjugated copolymers consisted of alkylthiophene as donor and benzothiadiazole as accepter unit with varying alkyl chains substituted at 3-position of the thiophene ring. The basic idea behind this molecular design was to reduce the polymer chain rigidity for imparting liquid crystalline (LC) behaviour. Presence LC behaviour and decrease in the LC temperature as a function of increasing alkyl chain length in these DA copolymers was confirmed by the thermal analysis. Large area oriented thin films were fabricated by FTM and utilized to investigate the charge transport after OFET fabrication. Annealing of oriented thin films at their LC temperature resulted in the dramatic increase in the extent of molecular orientation. It has found that keeping the same alkyl substitution, only replacement of H by F in one of central thiophene units exhibited improved charge transport with a field-effect hole mobility and on/off ratio 0.14 cm2/V. s, which was about 10 times higher as compared to its non-F substituted counterparts. Finally, Chapter 6 presents summary and overall conclusions along with the future prospect of this work. | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1 Introduction| 2 Materials and Methods| 3 Orientation and Anisotropic Charge Transport in Solution Processable DA Copolymer DPP-TTT| 4 Investigation of Anisotropic Charge Transport in Newly Designed DPP based DA Copolymers| 5 Investigation on Anisotropic Charge Transport in Novel DA Copolymers having Liquid Crystalline Behavior| 6 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455号 学位授与年月日: 令和5年3月24日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Conjugated Polymer | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Orientation | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Donor-Acceptor | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Floating Film Transfer Method(FTM) | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Surface Modification | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Organic Field-Effect Transistor | |||||||
| 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455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 | 2023-03-24 | |||||||
| 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4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 | 10.18997/0002000078 | |||||||
| ID登録タイプ | JaLC | |||||||
