https://techxplore.com/news/2021-01-compound-chili-peppers-spicy-boosts.html

The research, published January 13 in the journal Joule, determined that sprinkling capsaicin into the precursor of methylammonium lead triiodide (MAPbI3) perovskite during the manufacturing process led to a greater abundance of electrons (instead of empty placeholders) to conduct current at the semiconductor's surface.

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Jim Bell's comment:

Evidently, a careless person holding a taco got too close to the solar cell production line.