Transparent Conductive Oxide-less Back Contact Dye-sensitized Solar Cells Based on Cobalt Complex Redox Electrolyte

Molla, Md. Zaman

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コバルト電解液を用いた透明導電膜を必要としないバックコンタクト色素増感太陽電池

https://doi.org/10.18997/00004332

名前 / ファイル	ライセンス	アクション
sei_k_245.pdf (2.8 MB)

アイテムタイプ

学位論文 = Thesis or Dissertation(1)

公開日

2016-01-21

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

Transparent Conductive Oxide-less Back Contact Dye-sensitized Solar Cells Based on Cobalt Complex Redox Electrolyte

言語

タイトル

コバルト電解液を用いた透明導電膜を必要としないバックコンタクト色素増感太陽電池

言語

eng

著者

Molla, Md. Zaman

抄録

内容記述タイプ

Abstract

内容記述

The central theme of this thesis moves around the technical overview regarding the two bottlenecks of dye-sensitized solar cells such as removal of costly TCO components by employing flexible stainless steel metal mesh to pave the way towards low-cost DSSCs. At the same time, utilization of cobalt complex based redox shuttle to incorporate merits like weak visible light absorption, less corrosive nature to the metallic grid and more positive redox potential to produce higher open-circuit potential as compared to the most commonly employed iodine based electrolyte in TCO-less back contact DSSCs. Attempts have been made to understand the limiting factors and to search for their amicable solutions towards enhancing the overall photoconversion efficiency in such TCO-less DSSCs utilizing cobalt electrolyte. TCO-less back contact dye-sensitized solar cells were conveniently fabricated using nanoporous TiO2 layer (particle size 15-20 nm) screen-printed onto the stainless steel metal mesh and adsorbed with D-205 dye used as flexible photoanode based on cobalt based redox shuttle. Surface protection of the metal mesh was found to be highly beneficial to suppress the back electron transfer from the bare metal mesh to the oxidized species of cobalt redox electrolyte. Protection of metal mesh by a thin layer of Ti metal (sputtered) acting as charge recombination blocking layer led to the enhancement in the photoconversion efficiency of TCO-less back contact DSSC from 0.66% to 3.33%, which was little a less than that of the conventional DSSC consisting of TCO glasses (4.02%). Co-sensitization of D-205 dye with D-131 dye provided even further increase in the photoconversion efficiency to 3.59% because of their complementary photon harvesting properties in the region from 400-500nm. In order to enhance the photoconversion efficiency even further, TCO-less back contact DSSCs using nanoporous TiO2 layer having comparatively larger particle size of 30 nm expediting the mass transport of the [Co(bpy)3]2+/3+ species in combination with porphyrin sensitizer coded with YD2-o-C8 having magnificent photon harvesting over the whole visible region was also investigated. In this case, protection of metal mesh by a thin layer of Ti (sputtered) led to enhancement in the photoconversion efficiency to 4.53% as compared to the unprotected one(3.12%). Increasing the pore size of porous polymer PTFE film from 0.1 μm to 0.2 μm led to the further increase in the photoconversion efficiency to 4.89%. Moreover, Co-sensitization of YD2-o-C8 dye with Y123 organic sensitizer led to the further enhancement in the photoconversion efficiency up to 5.25% along with the impressive open-circuit voltage of 0.88 V. Finally, to enhance the photoconversion efficiency even further by enhancing the diffusion of [Co(bpy)3]2+/3+ species, TCO-less back contact DSSCs have been fabricated using comparatively thinner nanoporous TiO2 layer (5.5 μm) employed as an electrolyte absorbing layer coated onto to the Pt counter electrode. This modification was implemented as a replacement for the thick porous polymer PTFE film (35 μm). Protection of bare TiO2 layer (5.5 μm) used as an electrolyte absorbing layer with YD2-o-C8 dye retards the electrostatic binding very effectively between the negatively charged TiO2 surface and the positively charged Co3+ species owing to their long alkyl chain and provides the facile diffusion of the Co3+ species through the nanoporousTiO2 layer providing the best photoconversion efficiency of 6.42%.

内容記述タイプ

TableOfContents

内容記述

1. Introduction||2. Measurement procedures and methods||3. Transparent conductive oxide-less (TCO-less) back contact (BC) dye-sensitized solar cells based on cobalt electrolyte employing organic Indoline D-205 dye||4. Transparent conductive oxide-less back contact dye-sensitized solar cells using Zinc porphyrin dye employing cobalt complex redox shuttle||5. TCO-less DSSCs based on cobalt electrolyte employing nanoporous TiO2 film used as an electrolyte absorbing layer

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245号学位授与年月日:平成27年9月25日

キーワード

主題Scheme

Other

主題

Metal mesh

キーワード

主題Scheme

Other

主題

Back contact TCO-less

キーワード

主題Scheme

Other

主題

Dye-sensitized solar cells

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 Protection

アドバイザー

パンディ, シャムスディル

学位授与番号

甲第245号

学位名

博士（工学）

学位授与年月日

2015-09-25

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

平成27年度

出版タイプ

VoR

出版タイプResource

http://purl.org/coar/version/c_970fb48d4fbd8a85

アクセス権

open access

アクセス権URI

http://purl.org/coar/access_right/c_abf2

ID登録

10.18997/00004332

ID登録タイプ

JaLC

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コバルト電解液を用いた透明導電膜を必要としないバックコンタクト色素増感太陽電池

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コバルト電解液を用いた透明導電膜を必要としないバックコンタクト色素増感太陽電池

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