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.

   (End of quote)

   Jim Bell's comment:

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