Light-activated photocurrent degradation and self-healing in perovskite solar cells

Solution-processed organometallic perovskite solar cells have emerged as one of the most promising thin-film photovoltaic technology. However, a key challenge is their lack of stability over prolonged solar irradiation. Few studies have investigated the effect of light soaking on hybrid perovskites and have attributed the degradation in the optoelectronic properties to photochemical or field-assisted ion migration. Here we show that the slow photocurrent degradation in thin-film photovoltaic devices is due to the formation of light-activated meta-stable deep-level trap states. However, the devices can self-heal completely by resting them in the dark for

• UD
  U.S. Department of Energy

  Awards: 08SPCE973, DE-AC52-06NA25396, Contract No. DE-AC52-06NA25396, No. DE-SC0012704, AC52-06NA25396, SC0012704
• PU
  Purdue University
• CF
  Center for Integrated Nanotechnologies

  Award: DE-AC52-06NA25396
• CN
  Centre National de la Recherche Scientifique
• OO
  Office of Science

  Awards: No. DE-SC0012704, Contract No. DE-SC0012704, DE-AC52-06NA25396, SC0012704, DE-SC0012704
• NN
  National Nuclear Security Administration

  Award: DE-AC52-06NA25396
• BE
  Basic Energy Sciences

  Awards: Contract No. DE-SC0012704, DE-SC0012704, AC52-06NA25396, No. DE-SC0012704, SC0012704, 08SPCE973, DE-AC52-06NA25396
• LD
  Laboratory Directed Research and Development

  Awards: DE-SC0012704, DE-AC52-06NA25396
• BN
  Brookhaven National Laboratory

  Awards: SC0012704, No. DE-SC0012704, Contract No. DE-SC0012704
• LA
  Los Alamos National Laboratory

  Awards: Contract No. DE-AC52-06NA25396, AC52-06NA25396, No. DE-AC52-06NA25396, DE-AC52-06NA25396