成果報告書詳細
管理番号20140000000740
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 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2015/1/31
報告書年度2013 - 2013
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
英文要約Title : The development of high performance flexible CIGS PV modules(FY2010-FY2014)FY2013 Annual Report

Our objectives are to establish methods for manufacturing high efficiency flexible CIGS solar modules. The metal foil substrate with an insulating layer was used until last fiscal year for monolithically interconnected module development. From the advantages for providing high specific power (W/kg), we switched substrate material to the polymer from this fiscal year.

I. Fabrication of high efficiency flexible CIGS sub-modules (FUJIFILM)
(1) Technology for CIGS solar cell production using roll-to-roll process
Polycrystalline CIGS thin films were deposited onto the Mo-coated polymer substrate by co-evaporation from Cu, In, Ga, and Se sources. The solar cell with the CIGS film prepared by the roll-to-roll process showed an efficiency of 11.5% (Voc=0.47V, Jsc=39.5mA/cm2, FF=0.626, active area). On the other hand, an efficiency of 14.1% (Voc=0.58V, Jsc=35.4mA/cm2, FF=0.690, active area) was obtained with a cell using CIGS film prepared by the batch processes. By optimizing deposition processes in roll-to-roll process, it can be expected that efficiency will improve.
(2) Technology for encapsulation of flexible CIGS solar cells
In order to reduce the weigh of the module, prototype module structure using polycarbonate as a sealing material was designed. Since CIGS cells are very sensitive to moisture, they were effectively encapsulated by gas barrier films. We developed optimized encapsulation processes to pass the various lifetime tests (damp heat test, thermal cycling test, and so on.).

II. Technologies for high efficiency flexible CIGS solar cells (AIST)
We have succeeded in making high-efficiency integrated CIGS submodules whose conversion efficiency is 18.3 % with AR coating on soda-lime glass. The key technology which enables the achievement is the optimization of integration process, particularly the optimization of scribing technique and the properties of transparent conducting oxides (TCOs). The aperture area of the device is 4 cm2, and the solar cell properties of the device are Voc = 0.741 V/cell, Jsc = 29.05 mA/cm2, and FF = 0.762 and a designated area of 3.576 cm2. The diode properties and parasitic resistances of the submodule and a reference single cell containing a CIGS absorber layer identical to that in the submodule were determined using a distributed diode model. In addition, the fundamental loss mechanisms for the submodule were investigated.
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