成果報告書詳細
管理番号20140000000736
タイトル*平成25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2015/1/31
報告書年度2013 - 2013
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) FY2013 Annual Report In this project development of high efficiency concentrator cells, estimation of temperature characteristics of concentrator cells, confirmation of reliability of concentrator cells, and so on are required 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 exchange of technical information including samples and interaction of engineers are asked between EU organizations and our company. (1) Until FY2012 43.5% efficiency was confirmed as an official value at 241x to 306x concentration ratio under AM1.5D spectrum by Fraunhofer ISE. At the beginning of this financial year 44.4% efficiency was confirmed at 246x to 302x concentration ratio under AM1.5D spectrum again by Fraunhofer ISE. The increase of efficiency was because we succeeded in improving short circuit current by narrowing GaAs contact finger width which caused optical loss. We have been trying to further improve efficiency by optimizing anti-reflection coatings in order to increase quantum efficiency (QE) of the top cell which restricted current. (2) We evaluated temperature characteristics of inverted triple junction cells by measuring temperature dependence of spectral response and calculating current for each sub-cells. Although currents of all sub-cells were increased as temperature rose, the increase ratio to 25 degrees C was largest in the top cell and smallest in the bottom cell. Thus we obtained an indication that current matching of each sub-cells should be taken considering real operating temperature because currents are very close to each other in inverted triple junction cells. (3) We obtained results of module efficiencies using inverted triple junction cells we supplied to Fraunhofer ISE for their modules. Under outdoor measurement 32.5% efficiency was confirmed in a single module under 29.8 degrees C and 814W/m2 DNI, and 31.1% efficiency was confirmed in a six-series module under 35.0 degrees C and 782W/m2 DNI. (4) Meetings with EU organizations were held in April 2013 in Miyazaki and in November 2013 in London. Delivery of around 20 inverted triple junction cells for reliability test from Sharp to Universidad Politécnica de Madrid was decided as a milestone in London meeting. We fulfilled the milestone by sending 22 cells mounted on receiver plates with cables in March 2014. Interaction with Commissariat à l’énergie atomique et aux énergies alternatives, a French organization, was also decided in London meeting. We are planning to mutually evaluate cells and modules developed by us during May this year.
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