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Making solar cells with tofu salt

26 June 2014 Last updated at 09:48 BST

A new way of making solar cells could dramatically bring down the cost of generating energy from the Sun.

A team at Liverpool University has found a way of replacing the toxic element in the process with a material found in bath salts and tofu.

The research has been published in the Journal Nature and unveiled at the ESOF conference in Copenhagen.

The lead scientist Dr Jon Major explains how the new technique could dramatically reduce the cost of solar energy.