成果報告書詳細
管理番号20120000000359
タイトル*平成23年度中間年報 太陽エネルギー技術研究開発 太陽光発電システム次世代高性能技術の開発 高効率・高耐久性色素増感太陽電池モジュールの研究開発(高効率・高耐久性色素増感太陽電池の基盤的研究)
公開日2012/7/11
報告書年度2011 - 2011
委託先名学校法人東京理科大学
プロジェクト番号P07015
部署名新エネルギー部
和文要約和文要約等(以下本編抜粋)
1.1cm角程度セルおよび10cm角サブモジュールの高効率化技術の研究開発
(1)Vocの向上:MgO、Al2O3薄膜によるTiO2光電極の表面修飾効果によりVocを0.7Vから0.73Vまで向上させ、η=10.8%まで向上。その性能向上効果について詳細な解析を行い、さらなるVoc向上指針を得た。
(2)Jscの向上
(a)TiO2光電極の光閉じ込め効果の最適化
・従来型TiO2光電極の最適化でBlack dye DSC(5mm角)でη=11.2%を達成。
・ TiO2(Beads)を用いたBlack dye DSC(5mm角)でη=11.0%を達成。
  (b)新色素の開発
・N719系、Balck dye系の新規色素TUS-24、-25を開発。
(c)電解液の検討による性能の向上:Black dye DSC(4mm角)でη=11.8%を達成。
2.10cm角サブモジュールの耐久性向上の研究開発
(1)劣化原因の解明とその対策技術の開発:クリーンルームで作製することにより、B-1試験(85℃、1000時間)で効率低下がない条件を明らかにした。
(2)高耐久性色素の開発:Black dye色素より熱的安定性の高い色素TUS-20を開発した。
3.低コストサブモジュール作製のための基礎材料の研究開発
Pt代替カーボン対極の高性能化:スクリーン印刷型カーボン対極の開発。
(1)非FTOガラス基板TiO2光電極の作製:プレスによるTiO2/Ti光電極の製作を実施。
英文要約Title: Research and development in highly efficient and durable DSC modules
Sub-title: Fundamental study on highly efficient and durable DSC
FY2011 Annual report, Tokyo University of Science

1.The contents of this R&D and their results
1.1. The contents of this R&D.
The targets of this R&D are development of the 30cm-by-30cm DSC sub-modules exhibiting 10% conversion efficiency and achievement of the efficiency decrease within 10% after the A-1, A-2, A-5, B-1 and B-2 tests of JIS C-8938 environmental and endurance tests. In order to gain insights into the improvement of the highly efficient DSC sub-modules, it is also aiming to prepare the 1cm-by-1cm DSC showing more than 13% conversion efficiency.
1.2. Results.
(1) Studies on the improvement of the conversion efficiency of 1cm-by-1cm DSCs.
(i) Improvement of Jsc value: First attempt is cosensitization of the black-dye-based DSCs using an organic dye. Conversion efficiency of the black-dye-based DSC was effectively increased by using D131 or NKX-2553 as a cosensitizing dye. Moreover, this improved efficiency was further enhanced by adding DCA as a coadsorbent. 11.6% conversion efficiency was obtained under AM 1.5 (100 mW/cm2) irradiation in the black-dye-based DSC cosensitized with D131 in the presence of DCA. Second attempt is alternation of the electrolyte composition. A part of electrolyte composition was systematically replaced into the other compound. By this method, conversion efficiency of the DSC cosensitized with black dye and D131 was improved.
(ii) Improvement of Voc value: Surface modification of TiO2 photoelectrodes by various metal oxides has been carried out. In the cases that MgO or Al2O3 was employed as a thin overlayer for TiO2 nanoparticle, Voc value was improved by the blocking effect for the backward electron transfer from the conduction band of TiO2 to I3- in the electrolyte.
(2) Studies on the improvement of the long-term stability of 1cm-by-1cm DSCs.
(i) It is considered that small amount of water inside of the DSCs promotes dye desorption, therefore, DSCs were prepared under the conditions where the humidity was controlled to be lower. As a result, conversion efficiency was not decreased at all in the DSC with N719 prepared in the glovebox during the aging test (85 °C, 1000 h).
(ii) Novel dyes (TUS-20, TUS-21) showing both highly sensitizing ability and strong binding one have been prepared. TUS-20 showed much stronger binding ability compared to black dye, although the conversion efficiency of the DSC with TUS-20 (7.2%) was lower than that of the DSC with black dye (10.4%). On the other hand, the DSC with an improved model dye (TUS-21) showed 9.3% conversion efficiency although the binding ability of TUS-21 was lower compared to TUS-20.
(3) Investigation of the materials for the low-cost fabrication of DSCs.
A certain carbon material was found to be quite effective as a material for counter electrod, and 8.4% conversion efficiency was obtained in the DSC. This value is comparable to that of DSC with platinum counter electrode (8.9%).
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