Photon recycling in lead iodide perovskite solar cells

Lead-halide perovskites have emerged as high-performance photovoltaic materials. We mapped the propagation of photogenerated luminescence and charges from a local photoexcitation spot in thin films of lead tri-iodide perovskites. We observed light emission at distances of ≥50 micrometers and found that the peak of the internal photon spectrum red-shifts from 765 to ≥800 nanometers. We used a lateral-contact solar cell with selective electron- and hole-collecting contacts and observed that charge extraction for photoexcitation >50 micrometers away from the contacts arose from repeated recycling between photons and electron-hole pairs. Thus, energy transport is not limited by diffusive charge transport but can…

• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek
• KA
  King Abdulaziz City for Science and Technology
• EA
  Engineering and Physical Sciences Research Council

  Awards: EP/M005143/1, EP/G049653/1