Solar-Tectic announced that a patent application for a germanium-perovskite thin film tandem solar cell has been allowed by the US Patent and Trademark Office.

This type of crystalline thin-film germanium solar cells promise to be more efficient and less expensive than silicon and germanium wafer technology due to low temperature processing and less material use. In addition, the entire process is non-toxic since germanium is non-toxic and tin (Sn) is used to deposit the crystalline germanium thin-film material for the bottom layer in the tandem configuration; there is no toxic lead (Pb). The technology is the very first of its kind and in addition to the US is also eligible for world-wide protection.

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