Perovskites are cheap, abundant photovoltaic materials that some have hailed as the future of green energy.

Around the world, companies are layering perovskites on top of traditional silicon to develop so-called tandem solar cells that some think could deliver at least 20% more power than a silicon cell alone.

However, there remain multiple issues to overcome before these products are ready for widespread uptake in the notoriously competitive solar-power market.

This is an audio version of our Feature A new kind of solar cell is coming: is it the future of green energy?

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