Microscopic insight into non-radiative decay in perovskite semiconductors from temperature-dependent luminescence blinking

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Abstract

Organo-metal halide perovskites are promising solution-processed semiconductors, however, they possess diverse and largely not understood non-radiative mechanisms. Here, we resolve contributions of individual non-radiative recombination centers (quenchers) in nanocrystals of methylammonium lead iodide by studying their photoluminescence blinking caused by random switching of quenchers between active and passive states. We propose a model to describe the observed reduction of blinking upon cooling and determine energetic barriers of 0.2 to 0.8 eV for enabling the switching process, which points to ion migration as the underlying mechanism. Moreover, due to the strong influence of individual quenchers, the crystals show very individually-shaped photoluminescence enhancement upon cooling, suggesting that the high variety of activation energies of the PL enhancement reported in literature is not related to intrinsic properties but rather to the defect chemistry. Stabilizing the fluctuating quenchers in their passive states thus appears to be a promising strategy for improving the material quality.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Catholic University of Leuven
  • Helmholtz-Zentrum Berlin for Materials and Energy
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi
  • Materialkemi
Originalspråkengelska
Artikelnummer1698
TidskriftNature Communications
Volym10
Utgivningsnummer1
StatusPublished - 2019 apr 12
PublikationskategoriForskning
Peer review utfördJa