成果報告書詳細
管理番号20130000000801
タイトル*平成24年度中間年報 革新的太陽光発電技術研究開発(革新型太陽電池国際研究拠点整備事業) 高効率集光型太陽電池セル、モジュール及びシステムの開発(日EU共同開発) 先進構造による高効率集光型太陽電池の開発(WP3)
公開日2014/5/9
報告書年度2012 - 2012
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
英文要約Title: R&D on innovative Solar Cells (International Research Center for Innovative Solar Cell Program) "Ultra-high efficiency concentration photovoltaics (CPV) cells, modules and systems (WP3:Development of advanced CPV cells)" (FY2011-FY2014) FY2012 Annual Report
In this project high efficiency concentration cells are investigated using the outcome achieved in the preceding NEDO project "Research and Development of Post-silicon solar cells for ultra-high efficiencies (epitaxial technologies)". In addition contribution is asked for “Development of characterization tools for CPV cells, modules and systems (WP4)” by supplying concentrator cells and their subcells to official organizations like National Institute of Advanced Industrial Science and Technology (AIST). Investigation on inverted lattice mismatch triple junction cells has been continued since FY2011. In FY2011 43.5% efficiency was confirmed at 300x to 500x concentration ratio in cells with 200μm grid pitch and 4mm x 4mm size in house measurement. Fraunhofer ISE performed an official measurement under AM1.5D concentration for the cell in April 2012. 43.5% efficiency was confirmed at 240.7x to 306.3x also at their measurement. Thus 42% target value in FY2012 was confirmed officially. In order to achieve 45% efficiency which is FY 2014 target we tried to improve the current in the cells by reducing optical loss. We narrowed the width of GaAs contact layer, which acts as an absorber for short wavelength light sensitive for the top cell. After the width was reduced to 6μm from former 9μm, 43.8-44.2% efficiencies were confirmed at 300x to 500x concentration ratio in cells with 200μm grid pitch in house measurement. We are now trying to further improve the current in the cells by modifying the top cell structure. We also performed reliability test for the concentrator receivers with inverted lattice mismatch triple junction cells. In the test under 85 degree C and 85% humidity atmosphere, no remarkable degradation of Voc and FF was not observed in the receivers after 1,500h exposure. Investigation of 4 junction cells was performed in collaboration with Tokyo University (TU) and Toyota Technological Institute (TTI). We supplied Ge cell samples to TU members. After TU grew 1eV InGaAsN based cell on them, we again grew 2 junction cells on them. These were the first 4 junction cells by wafer transfer (we call it “wafer shuttle”). Cell fabrication is ongoing at TU side at the end of March. Meetings with EU organizations were held in April 2012 in Freiburg Germany and in November 2012 in Nagoya. Delivery of around 10 concentrator cells for module fabrication from Sharp to Fraunhofer ISE was decided as a milestone in Freiburg meeting. We fulfilled the milestone by sending sixteen cells early January 2013. In Nagoya the concentrator cells with 43.8-44.2% efficiencies measured at Sharp were decided to be measured at Fraunhofer ISE. We fulfilled the milestone by delivering the cells early January 2013.
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