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アイテム
コバルト電解質を用いた色素増感型太陽電池用近赤外色素の分子構造の光電変換に及ぼす影響の研究
https://doi.org/10.18997/00007212
https://doi.org/10.18997/00007212de336a0c-3156-4360-8f4e-4e45c8b14298
| 名前 / ファイル | ライセンス | アクション |
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sei_k_332.pdf (5.9 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 | 2019-06-13 | |||||||
| 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 | Investigating the Impact of Molecular Structure Near Infra-Red Sensitive Dyes on Photoconversion for Cobalt Electrolyte Based Dye-Sensitized Solar Cells | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | コバルト電解質を用いた色素増感型太陽電池用近赤外色素の分子構造の光電変換に及ぼす影響の研究 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Anusha Pradhan
× Anusha Pradhan
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Dye sensitized solar cell （DSSC） falls under one of the splendid solar cells, which have amicably attracted mammoth research. The superlative of it amongst the other solar cells is its inspiration from natural photosynthesis, transparency and vivid colors imparting beauty and attraction. In addition, the cost of fabrication is expected to be relatively low compared to commercial solar cells owing to low cost raw materials and processes not demanding for use of high energy. Research in past two decades have demonstrated not only nearly quantitative photon harvesting in visible region but also the photoconversion efficiency （PCE） 12-14 %. This poses acute need for the design and synthesis of novel NIR dyes to have more photon flux harvested leading to further enhancement in the photoconversion efficiency （PCE）. Beside the panchromatic photon harvesting for high current density （Jsc）, there is also need for maximizing the open circuit voltage （Voc）, which demands for use of electrolytes with deeper redox potential. The 1st chapter introduces the need of huge energy demand by the growing population and hence the necessity of the next generation solar cells. Keeping this mind, a brief discussion of the third generation solar cells like organic solar cells, DSSCs and perovskite solar cells has been done with emphasis on DSSCs. Importance of various dye sensitizers and redox electrolytes employed for DSSC justifying the need for squaraine dyes as NIR sensitizer and cobalt redox electrolyte. 2nd chapter deals with details about necessary chemicals and reagent for synthesis of sensitizers and their intermediates, basic instrumentation and various characterization techniques used for the entire research work carried out during doctoral course. 3rd chapter focusses on estimation of minimum energy barrier for dye regeneration using NIR sensitive squaraine dyes as sensitizers and most commonly used I-/I3- redox electrolytes redox electrolytes. It was found that the alkyl chain plays a crucial role in controlling the energetics. It has been demonstrated that it is possible to have dye regeneration with a minimum energy barrier of 0.12 eV. In the 4th chapter, optimization of DSSCs fabrication parameters was done using one of the model NIR sensitive squaraine dye （SQ-75） and Co（bpy）2+/3+ redox electrolyte was conducted. TiCl4 surface treatment was found to control the overall PCE and especially it was more effective when treatment was done on both of the FTO glass substrate and mesoporous TiO2 layer. At the same time, only 6 μm thick mesoporous TiO2 was found to be optimum considering the high molar extinction coefficient of the dye and bulky nature of the redox electrolyte. Dye aggregation owing to planarity of dye molecule demanded optimization of coadsorber for dye aggregation prevention and 20 times of its use with respect to the dye was found to be optimum for the best device performance. DSSCs using NIR dyes in combination of cobalt electrolyte needs strict surface passivation for both of conducting substrate as well as mesoporous TiO2 layer. Utilization of optimized surface passivation discussed in the previous chapter, dye structure level optimization was attempted in the 5th chapter. This chapter utilizes longer alkyl chain bearing NIR dyes to provide additional surface passivation needed for cobalt electrolyte based DSSCs. Newly designed squaraine dye with two long and branched alkyl chains （SQ-110） was found to perform well as NIR sensitizer providing best PCE amongst newly designed dyes. Considering the narrow wavelength and intense light absorption by newly designed squaraine dyes, efforts was directed for wide wavelength photon harvesting utilizing a dye cocktail of one of the best NIR dye （SQ-110） with cobalt electrolyte compatible visible sensitizer （D-35） in the 6th chapter. In the present dye-cocktail, DSSCs consisted of different ratios of the constituent dyes, mutual control of dye aggregation, complementary photon harvesting and FRET between two dyes are found to be responsible for synergistically enhanced photon harvesting in the wide wavelength region. It has been demonstrated that a compact TiO2 on FTO and a bilayer TiO2/MgO surface passivation was necessary for getting the optimum DSSC performance with optimum dye cocktail of D-35 and SQ-110 in （4:1）. Finally, last and 7th chapter summarizes the general conclusion of the whole thesis along with the outlooks and future prospects of the present work. | |||||||
| 目次 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 1 Introduction to Solar Cell||2 Experimental: （Instrumentation and Characterization）||3 Investigation on minimum driving force for the dye regeneration||4 Parametric Optimization of DSSCs Using Far red Sensitizing Dye with Cobalt Electrolyte||5 Development of Unsymmetrical Squaraine Dyes for DSSCs utilizing Cobalt Electrolyte||6 Wide Wavelength Photon Harvesting: Implication of dye cocktail and surface Passivation||7 | |||||||
| 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332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 | DSSCs | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | NIR sensitizers | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Squaraine dyes | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Cobalt electrolyte | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | Surface passivation | |||||||
| 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332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 | 10.18997/00007212 | |||||||
| ID登録タイプ | JaLC | |||||||
