成果報告書詳細
管理番号20130000000574
タイトル*平成24年度中間年報 新エネルギー技術開発 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2015/2/19
報告書年度2012 - 2012
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
英文要約Title: R&D for Next Generation PV systems. R&D for organic photovoltaic modules using small molecules. (FY2010-2014) FY2012 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 a relatively shorter-wavelength region simultaneously. In the fiscal year of 2012, we have synthesized p-type small molecules for vacuum process or solution process and have evaluated their photovoltaic performances. As the shorter-wavelength absorption cells we obtained the efficiency of 6.5 % for the single cell with NPV-03 found out in last fiscal year by using the vacuum evaporation on a heated substrate. In order to obtain the long-wavelength absorption cells we have synthesized some small molecules which have intense absorption around the wavelength of 800 nm. But we could not obtain any efficient single cells using those materials. Therefore, polymer A (Sumitomo chemical company, Limited) was used for materials with quite intense long-wavelength absorption just mentioned above. By combining those materials and the vacuum-processed intermediate layers developed last fiscal year, we successfully obtained the efficiency of 8.2% which achieved the intermediate target (>8%) in cooperation with Toshiba Corporation and AIST (Advanced Industrial Science and Technology). 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 OPV cells have been continuously evaluated by photoelectron yield spectroscopy and Kelvin method. In order to ensure the possibility of OPV into a practical use we fabricated OPV modules with the size of 20cm square at the R&D center of CANON TOKKI CORPORATION. That tandem OPV module indicated the module efficiency of 5.0% (da). The possibility of its practical use was demonstrated by displaying that module at PVJapan2012 (5th Dec.-7th Dec.). We have done durability studies of OPV modules and cells in collaboration with AIST and CANON TOKKI CORPORATION. As one of the durability studies the continuous irradiation tests for 2mm square cells have been done. The power conversion efficiency of the 2mm square cell has decreased by 9% in 500 hours under the continuous irradiation test of JIS-C8938. The power conversion efficiency of the 2mm square cell has hardly changed in 1000 hours under the heat resistance test of JIS-C8938. The results of the above two durability tests achieved the intermediate target. The reason why we obtained such good durability is deduced to be stability of the inverted cell structure and the excellent sealing ability which prevents oxygen or moisture from coming outside.
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