A problem that exists with these developments is the context of sustainability is that they often use rare elements for mundane tasks, and this is a result of market economics.
While Indium is a bye product of other mining activity there is not a lot of it on the planet in net terms but the market thinks it is abundant because it is relatively cheap and available to it.
This is a fundamental flaw in market economics, the market is only sensitive to the amount of a commodity available to it, and not to the absolute amount of it that exists.
The ulterior motive in this type of development is clear, polymer photovoltaic cells are inefficient but cheap and seem to be being developed largely for a disposable market, and those with interests in Indium production see an opportunity to add a great deal more of it to landfill sites.
Indium is a very useful substance in phtovoltaics because it is used in high efficiency cells with a very broad conversion spectrum
what is needed is an economic mechanism to restrict its use to such things and not business as usual once through disposability.
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