成果報告書詳細
管理番号20120000000374
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 有機薄膜太陽電池モジュール創製に関する研究開発(低分子系有機薄膜太陽電池モジュールの研究開発)
公開日2013/6/25
報告書年度2011 - 2011
委託先名出光興産株式会社
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)
中間評価における目標達成のため、ヘテロタンデム方式を検討した。この方式では長波長側を吸収するものおよび相対的に短波長側を吸収するもの、以上二つの異なる高効率なp材料を開発する必要がある。今年度出光は50種類の材料を開発、評価した。うち5種類で変換効率が5%以上となる高性能なポテンシャルを示したが、上記へテロタンデム方式に適した二つのp材料の開発には至っていない。プロセスの観点ではp材料とn材料の界面構造を調べ、その制御を昨年度導入した熱処理機構で検討した。また基礎的な観点では、引き続き千葉大学にて高効率化の検討を実施している。
タンデムセルの構成検討では、高透過率および高導電率を併せ持つ高性能な中間電極を開発した。上記のとおり十分な波長分離は得られていないが、この中間電極を用いることでタンデムにて6.1%の効率を得た。
低分子蒸着型の実用可能性を実証するため、キヤノントッキ社において20cm角のモジュール試作を行った。塗布法で形成するモジュールに比べ、集積化による効率低下が顕著に抑制された。産業総合技術研究所およびキヤノントッキ社と連携し、セルおよびモジュールの耐久性評価も開始した。2mm角セルについてはJIS8938の連続光照射試験500時間において、初期からの効率低下が24%であった。この効率低下は外から侵入した酸素或いは水分が、材料を劣化させた為と考察した。現在対策を実施中である。
英文要約Title: R&D for Next Generation PV systems. R&D for organic photovoltaic modules using small molecules. (FY2010-2012) FY2011 Annual Report

The purpose of this project is to develop organic photovoltaic (OPV) modules using small molecules. In order to achieve the target of the efficiency for the fiscal year of 2012, hetero-tandem cell structures with small molecules have been chosen. In these structures it is necessary to obtain highly efficient two p-type materials one of which absorbs sun light in a long-wavelength region and the other of which absorbs relatively shorter-wavelength region simultaneously. In the fiscal year of 2011 we have synthesized 50 p-type materials and have evaluated their photovoltaic performances. We have over 5 materials possessing the efficiency of over 5%, which has the same basic molecular structure. But we have not developed the combinations of p-type materials suitable for hetro-tandem cell as mentioned above yet. In order to study the purification dependence of a material on the photovoltaic efficiency, we have introduced the sublimation apparatus from Professor Hiramoto of Institute for Molecular Science. The interface structures between p-type and n-type materials have been investigated and have been tried to optimize. Unfortunately we have not obtained good results yet, but we will be able to improve the efficiency by controlling the molecular orientation of the p-type materials. In order to investigate OPV operating mechanism the fundamental analyses have been started at Chiba University. In this fiscal year, bulk and interfacial electronic structures of the comprising materials for an OPV cell have been evaluated by photoelectron yield spectroscopy and Kelvin method. In regard to a tandem cell structure study, we have successfully developed a highly efficient interstitial electrode with both high transparence and high conductivity. Even if we could not apply the good combination of materials as mentioned above, we obtained the efficiency of 6.1% by using the interstitial electrode. This high efficiency shows that the interstitial electrode is essentially effective for a tandem cell. In order to ensure the possibility of OPV into a practical use we fabricated OPV modules with the size of 20cm square for trial at the R&D center of CANON TOKKI CORPORATION. And we have started the durability study of OPV modules and cells in collaboration with AIST (Advanced Industrial Science and Technology) and CANON TOKKI CORPORATION. We have shown that the efficiency loss was so much restrained as compared to printed OPV when the OPV cells were integrated and enlarged to fabricate modules. As to the durability study the continuous irradiation tests for both a 20 cm square module and a 2mm square cell have been done preliminary. The power conversion efficiency of the 2mm square cell has decreased by 24% in 500 hours under the continuous irradiation test of JISC8938. The reason of its decrease is deduced to be the degradation of the molecules due to the coming of oxygen or moisture from outside.
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