成果報告書詳細
管理番号20120000000365
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 三層協調界面構築による高効率・低コスト・量産型色素増感太陽電池の研究開発(高効率・高耐久性モジュールに関する研究開発)
公開日2012/6/20
報告書年度2011 - 2011
委託先名シャープ株式会社
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
モノリシック型集積モジュールの研究開発において、モジュールを構成するユニットセルの高効率化、集積による発電面積ロスの低減、大面積均一化製膜技術を実施した。5cm角モジュールを作製した結果、変換効率9.2%(AIST測定値、以下AIST)という変換効率を得た。さらに、電極均一成膜技術を用いることで、10cm角、15cm角モジュールにおいて、それぞれ、変換効率8.9%, 9.0%(AIST)を得た。
 また、上記技術を適用した結果、1cm角セルで変換効率11.0%(AIST)を得た。
信頼性向上技術の研究開発では、耐光性試験A-5テストにおける劣化メカニズム解析に取り組み、紫外線照射に対してセル状態では色素と電解液は劣化せず、性能低下はTiO2内で生成する電子-正孔対の関与を明確にした。また、キャリア輸送材中のヨウ素レドックスの安定性が溶媒と添加物に大きく影響されることを見出した。
 上記知見をもとに、モノリシック型セルを用いたA-2テスト、A-5テスト、B-1テストを実施した。A-2テスト、A-5テストでは、性能低下10%以内を達成した。また、B-1テストでのサンドイッチ型セルとモノリシック型セルにおいてほぼ同等の性能保持率が得られた。
英文要約Title: Research and development of high-efficiency and low-cost dye-sensitized solar cells and their mass production technologies based on the three phase-harmonized interface (FY2010-2012) FY2011 Annual Report New Technology Development Center Sharp Corporation
Introduction: The purpose of this research is the development of high-efficiency and low-cost dye-sensitized solar modules suitable for mass production. In FY2011, high-efficiency and low-cost module structures of DSCs were discussed and the issues of an integrated DSC module were highlighted. Also, high durability issues were addressed.: [Target (until the end of FY2012)] 1. Development of an integrated DSC module of ca. 30cm x 30cm with a 7% efficiency 2. Development of a high-stability module with a relative degradation ratio of less than 10% under JIS-C8938 A-2(10 cycles), A-5(500h) and B-2(1000h) tests: Experiments and results: 1) Development of a high-efficiency integrated DSC module: In FY 2010, we have pointed out that it is especially important to develop porous insulating layer for monolithic modules. In FY 2011, we investigated the influence of the porous insulating layer for monolithic-type DSC. It succeeded in suppressing the decrease of short circuit current density of the DSC. We also managed to obtain a 9.2% conversion efficiency from a monolithic-type integrated module (5cm x 5cm; module 1) at this term. As a next step, we attempted the fabrication of the large scale of the monolithic-type integrated module (10cm x10cm; module 2). It was found that the FF of module 2 was lower than that of module 1, because of Jsc fluctuation of unit cells in the module components. Therefore, the uniformity fabrication technology of porous semiconductor electrode, which has been based on the results in FY2009, is applied; the absolute deviation of the Jsc in module 2 was improved. Using this technique, the monolithic-type integrated module (15cm x 15cm; module 3) was fabricated. Consequently, we obtained a 9.0% conversion efficiency from module 3, which is the world record in the 15cm x 15cm size. In addition to investigating the module properties, we also fabricated unit cells (1cm x 1cm size); the conversion efficiency was 11.0%, which is the world record in small size cells. The intermediate target of FY2012 was achieved. 2) Development of a high-stability DSC module: In order to make clear the degradation mechanism of the DSC devices, we have investigated the decrease factor under JIS-C8938 A-5 test. The decrease factor consisted of mainly two factors; the first point is the decrease of the electron injection coefficient from adsorbed dye to semiconductor nano particles based on the upper shift of conduction band level of the semiconductor, and the second is the degradation of the electrolyte by the generation of the electron-hole pairs. Then, the materials in the electrolyte for high-stability modules were developed. Especially, we focused on the dependence of the solution properties on time decay. We found that using commercially available electrolyte solutions with the same composition would not yield the same properties. As discussed above, we have investigated the stability test of monolithic cell under A-2, A-5 and B-1 test. Finally, we managed to pass the A-2 and A-5 tests with a relative degradation ratio of less than 10%. In case of B-1, it was found that the performance retention of the monolithic-type cell is almost similar to that of the conventional-type (sandwich-type) cell.
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