The problem of production of flexible solar panels
Japanese Institute announced that they have been able to achieve efficiency in the value of 17.7% for the solar panels from CIGS (a semiconductor material, made of copper, iridium, gallium and selenium) on a flexible substrate. The efficiency of solar panels, developed by the National Institute of advanced science and technology in industry (National Institute of Advanced Industrial Science and Technology, AIST), is one of the highest in the world for their class.
The production of flexible solar cells are still faced with the challenge of forming semiconductor p-type. The concentration of semiconductors p-type flexible CIGS-controlled batteries adding alkali metals group, such as sodium. This may be selenid or sodium fluoride. But Na2Se and NaF unstable and provide badly predictable result.
AIST team developed a technology called thin-layer method of alkali-silica glass. Under this method, the first layer of silica glass is formed on the substrate, alkali metal penetrates through the rear electrode through the diffusion and into the light absorbing layer. Number penetrate alkali metal group depends on the parameters of forming layer of silica glass. The method facilitates the addition of alkali metal and increases the homogeneity of the material, influencing the efficiency of solar batteries.
AIST uses in the production of batteries, three types of substrates - ceramic, transparent plastic film production Teijin Ltd. and titanium foil with a rough surface. The effectiveness of 17.7% was achieved with a ceramic substrate. The effectiveness of using plastic film and titanium foil is 14.7% and 17.4%.
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