Infrastructure is the stuff that makes life possible. But it's an eyesore. As early as the 1910s, Pittsburghers sought ways to hide it.

Perovskite solar cells (PSCs) have accomplished an efficiency of ~25%. The most commonly used perovskite solar cell is methyl-ammonium lead iodide. As all PSCs with PCEs > 20% use Pb-based perovskites ...