成果報告書詳細
管理番号20120000000579
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(色素増感太陽電池モジュール化技術と高耐久性化研究開発)
公開日2012/11/28
報告書年度2011 - 2011
委託先名株式会社フジクラ
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)
 本年度の研究開発では、まず昨年度までに開発した高耐久性と高効率とを両立可能な構成を用いてη(ap) = 8%程度の5cm角セルを作製し、JIS C 8938試験で最も過酷となるB-2試験(85℃, 85% RH, 1000時間)を実施した。本試験ではセル効率をほぼ維持することに成功し、1000時間後の効率低下5%以内を40セル中32セルで達成した。
 また、モジュールの大面積化では2つのユニットセルからなる25cm角の2直列モジュールを作製し、最高でη(ap) = 7.4%の効率を得た。本モジュールの耐久性改善として、大面積に適用可能な保護層形成技術やモジュール封止技術を開発し、25cm角でも性能低下を抑えることに成功した。その結果、η(ap) = 7.2%の25cm角モジュールにおいてB-2試験(85℃, 85%RH, 1000時間)後の相対効率低下3%を達成した。NEDOにおける2013年3月末までの色素増感太陽電池モジュールの達成目標は、30cm角程度のモジュールで7%以上の効率かつJIS C 8938試験での相対効率低下10%以内であり、本研究開発ではこの目標を2011年度中に達成することに成功した。
高効率化技術としては、昨年度の最高効率がη(ap) = 8.4%であった5cm角セルに対し、電解液組成、チタニア電極構造、色素吸着条件などをそれぞれ改善し、B-2試験での効率維持が可能な材料構成で、効率をη(ap) = 9.2%まで向上させることに成功した。
英文要約Title: Development of Next-generation High-performance Technology for Photovoltaic Power Generation System. Research and Development of Highly Efficient and Durable Modules of Dye-sensitized Solar Cells (FY2010-FY2012) FY2011 Annual Report
1. This R&D. The Dye-sensitized solar cell (DSC) can be prepared by screen-printing without needing a high vacuum process. Therefore, DSC is expected as a low-cost PV. Fujikura Co., Ltd. achieved less than 1% of relative efficiency declines by the JIS C8938 durability test using 5cm-by-5cm DSC. Moreover, we achieved 8.1% efficiency (active area) of 20cm-by-20cm DSC submodule made by durable materials. In this R&D, we will perform the technology development of the highly efficient DSC module which is durable outdoors for a long time. For the target in this R&D, the all DSC module achieves less than 10% of efficiency declines after the JIS C8938 test. After that, we achieve 8% of efficiency at 30cm-by-30cm DSC modules until 2012, and the 10% efficiency is the final aim until 2014. In order to establish above-mentioned targets, Fujikura conducted the research subjects described below. (1) "The R&D of a large area and the high durable DSC module" In this R&D, we perform technology development for the purpose of the high durable establishment that can endure outdoors use for a long term in DSC module having more than 30cm-by-30cm areas. (2) "The outdoor durable test of the DSC module" On this theme, we develop a manufacture technology of the large area DSC panel which connected DSC modules, for the practical use of DSC. Moreover, we carry out the outdoor actual proof test and examine properties change of the DSC in the practical use environment. (3) "The efficiency improvement technology development of the high durable DSC module" In this subject, we carry out various technology developments to achieve over 10% of conversion efficiencies about a high durable DSC module. 2. Results. At first of this year, we made 5cm-by-5cm cells that show around 8% conversion efficiency (aperture area), using the composition, that could balance the high durability and the high efficiency which we developed by last year. These cells were exposed to the most difficult B-2 test (85 degrees Celsius, 85% RH, 1,000 hours) in JIS C 8938 tests. In this test, we succeeded in almost maintaining conversion efficiency and achieved less than 5% of efficiency declines in 32 cells among 40 cells. Moreover, as enlargement of the module area, we made 25cm-by-25cm series connected modules consisting of two unit cells and obtained the conversion efficiency of 7.4% (aperture area). As the durability improvement of this module, we developed a protective layer manufacture technology and the module-sealing technology that were applicable to a large area. As a result, we achieved 3% of relative efficiency declines after the B-2 test (85 degrees Celsius, 85%RH, 1,000 hours) at the 25cm-by-25cm module with 7.2% conversion efficiency (aperture area). The target of the DSC module until the end of February 2013 in NEDO is less than 10% of relative conversion efficiency declines by JIS C 8938 tests in a module of about 30cm-by-30cm with conversion efficiency of more than 7%. We achieved this target by the end of 2011. For an efficiency improvement technology, we improved electrolyte composition, titania electrode structure, a dye adsorption condition and succeeded in improving conversion efficiency of 5cm-by-5cm cell from 8.4% to 9.2% (aperture area) using materials having the durability.
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