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I know these have theoretically higher efficiencies at the cost of longevity, but I am curious if there is anything else that makes them desirable. Are they cheaper to make?

Having lead really sours my take on them. Everything from production to deployment to recycling gets worse.

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These apparently use tin instead of lead.

https://www.internationaltin.org/oxford-pv-moving-toward-nex...

It is described as being "tin-using" which means there could still be lead. Towards the end of the article it even states that a competing panel uses tin-lead which can be described as "tin-using".

[1] is a press release from the original result that has been developed, and specifically refers to replacing lead with tin, with the purported reason to produce a lead-free cell for easier commercialisation (due to the concerns over lead). I chose to share the other link originally because it was newer.

[1] https://www.ox.ac.uk/news/2014-05-01-lead-out-tin-cheap-sola...

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