成果報告書詳細
管理番号20140000000296
タイトル*平成25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2014/12/27
報告書年度2013 - 2013
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The purpose of this project is to develop organic photovoltaic (OPV) modules and to put them into practical use. In order to achieve the target of the photoelectric conversion efficiency of 12% for the fiscal year of 2013, tandem cell structures for solution process 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 2013 polymer A (Sumitomo Chemical Company, Limited) was used for materials which absorb sun light in a long-wavelength region. Therefore we have synthesized p-type molecules which absorb sun light in a shorter-wavelength region. We obtained the efficiency of 8.5 % for the single cell with NPV-22 developed in this fiscal year by solution process. Besides NPV-22 we have developed several materials for single cells over 7% that all have a good solubility and a good film-forming property(NPV-14, NPV-20, NPV-23). Furthermore, we have developed intermediate layers for a solution-processed tandem cell. In order to verify the performance of the intermediate layers, we tested the tandem cell with our intermediate layers in combining polymer A with PTB-7, and obtained the efficiency of 8.3 % for the tandem cell which showed Voc near the sum of Voc in each single cells. Eventually we obtained the efficiency of 8.7 % for the tandem cell in combining NPV-20 with polymer A. The reasons why the efficiency remained under 10% are that there was a relatively large overlap between the absorption spectra of NPV-20 and that of Polymer A and there was a room for improvement of the intermediate layers to be solved an issues such as a small value of parallel resistance. In order to investigate an OPV operating mechanism ,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. We have done durability studies of OPV cells in collaboration with AIST and CANON TOKKI CORPORATION. In the durability studies 2mm square cells have been tested. The power conversion efficiency of the 2mm square cell has hardly changed over 3,000 hours under the heat resistance test of JIS-C8938. This result showed that the OPV mainly comprising organic materials have a sufficient stability to practical use. The reason why we obtained such good durability is deduced to be the good stability of the inverted cell structure and the excellent encapsulation technic which prevents oxygen or moisture from coming outside.
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