Editing Indium tin oxide (section)

==Constraints and trade-offs==
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A major concern with ITO is its cost. ITO costs several times more than [[aluminium zinc oxide]] (AZO). AZO is a common choice of [[Transparent conducting film|transparent conducting oxide]] (TCO) because of its lower cost and relatively good optical transmission performance in the solar spectrum. However, ITO is superior to AZO in many other important performance categories including chemical resistance to moisture. ITO is not affected by moisture, and is stable as part of [[Copper indium gallium selenide solar cells|copper indium gallium selenide solar cell]] for 25–30 years on a rooftop.

While the sputtering target or evaporative material that is used to deposit the ITO is significantly more costly than AZO, the amount of material placed on each cell is quite small.  Therefore, the cost penalty per cell is quite small, too.