Greentech Media: "In the solar business, it's a code word for 'headache.' One of the major hurdles facing manufacturers of copper indium gallium selenide (CIGS) and copper indium selenide (CIS) solar cells lay in orchestrating those active ingredients to form uniform, consistent crystals in an evenly spaced manner so mass manufacturing becomes economical.
The techniques for applying selenide vary: some create copper, indium and gallium selenides and then apply these substances to substrates, while others introduce selenide with a jet of hydrogen gas in a high temperature chamber.
'It becomes a complicated process to control all of these elements,' said David Mitzi, who leads a team at IBM Research that last week unveiled an unusual solar cell made from copper, tin, zinc, selenium and sulfur (CTZSS). 'Cadmium telluride (the basis for First Solar's solar cells) is pretty simple. You can evaporate bulk cad tel and get it to land as bulk cad tel.'"
Friday, February 19, 2010
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