text: Yo, check it out, listen up to this rap,
  About perovskite solar cells, they got that dope trap.
  High efficiency, low cost, they the real deal,
  Methylammonium lead-iodide, let me reveal.
  
  We been grindin' in the lab, doin' research,
  Optimizing film morphology, reachin' for the stars.
  Power conversion efficiency, we aim to enhance,
  Smooth contact, no pinholes, that's our chance.
  
  Charge transport, collection, no recombination,
  We gotta make sure it's the perfect combination.
  So here's the deal, we got a trick up our sleeve,
  Polystyrene, we insert, and believe.
  
  Just a small amount, but it makes a big change,
  Better surface coverage, ain't that strange?
  Smooth and uniform, that perovskite thin film,
  Crystallization improved, grain size on the brim.
  
  We optimized the process, no need for stress,
  Solution-based, low temp, don't settle for less.
  Below 100 degrees Celsius, that's all we need,
  PCE above 13%, that's our creed.
  
  Leakage current reduced, we on top of the game,
  Perovskite solar cells, we out to make a name.
  So remember this rap, 'bout our breakthrough invention,
  Perovskite power, the future's our intention.