成果報告書詳細
管理番号20120000001170
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 フレキシブルCIGS太陽電池モジュールの高効率化研究
公開日2013/10/31
報告書年度2011 - 2011
委託先名富士フイルム株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約本研究開発は高効率な集積型フレキシブルCIGS太陽電池を実現することを目的としており、本年度は平成22年度に構築したプロセス技術をベースに、更なる高効率化と大面積化/高生産性化を実現するプロセスの開発を行った。その結果、10×10cm2基板サイズのフレキシブル・サブモジュールにて変換効率15.9%(目標16.0%)を達成した。また高効率化の要素検討を進め、CIGS薄膜を堆積する際のSe/IIIが従来条件よりも低い領域に最適条件があることを発見し、ガラス基板上の小面積セルの変換効率として19.4%を達成した。
英文要約Title : High performance PV generation system for the future / The development of high performance flexible CIGS PV modules

Our objectives are to establish methods for manufacturing high efficiency flexible CIGS solar modules. We use novel structure metal foil substrates with an insulating layer. The substrates have a capability to offer flexible and high efficiency integrated CIGS modules. The research target of FY2011 is 16% efficiency on 10×10cm2 substrate.

I. Fabrication of high efficiency flexible CIGS sub-modules. (FUJIFILM)
In the previous fiscal year, our development efforts were mainly in improving the conversion efficiency of CIGS solar cells formed on a flexible metal substrate. After achieving conversion efficiency of 15.1% with flexible CIGS sub-module, further efficiency improvement was attempted this year.
(1)Preparation of high quality CIGS films on flexible metal substrates
In order to fabricate high efficiency CIGS solar cells using metal substrate, growth condition of CIGS thin films was optimized. As a result, an efficiency of 18.1% (Voc=0.63V, Jsc=39.0mA/cm2, FF=0.73, an active area of 0.488 cm2) was achieved.
(2)Fabrication of 10×10cm2 size CIGS sub-modules
An efficiency of 15.9% was obtained with Voc=10.57V, Isc=145.1mA, FF=0.722, and designated area 69.6cm2 with antireflective coating. The research targets of FY2011 were achieved approximately.

II. Technologies for high efficiency flexible CIGS solar cells. (AIST)
Key technologies which can lead to the improvements in CIGS flexible solar cell and submodule performances have been investigated. We have succeeded in making high-efficiency integrated CIGS solar cells whose conversion efficiency is 19.4 % with AR coating. The key technology which enables the achievement is the control of Se/III flux ratio. It has been believed for a long time that the high value of the Se/III flux ratio is not critical; the values of about 30-50 have been often used for the Se/III ratio. On the other hand, we have revealed that the Se/III flux ratio has the optimal value, which is in the range of 7-10. Thus, we have adopted the new optimal conditions for the Se/III ratio, and realized the CIGS solar cells whose conversion efficiency is 19.4 %.
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