Abstract
High-efficiency CIGS solar cells and submodules have been developed at AIST. By developing the water-vapor assisted deposition technique, widegap CIGS solar cells with conversion efficiencies of over 18% with V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">oc</inf> =0.744V have been demonstrated. The conversion efficiencies of integrated submodules on 10x10cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> sodalime glass substrates have been improved up to η=16.2% by using coevaporation process. These results indicate that the CIGS technologies are competitive with the current Si and CdTe technologies in terms of both cost and performance.
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