Are Shockley-Read-Hall and ABC models valid for lead halide perovskites?

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Metal halide perovskites are an important class of emerging semiconductors. Their charge carrier dynamics is poorly understood due to limited knowledge of defect physics and charge carrier recombination mechanisms. Nevertheless, classical ABC and Shockley-Read-Hall (SRH) models are ubiquitously applied to perovskites without considering their validity. Herein, an advanced technique mapping photoluminescence quantum yield (PLQY) as a function of both the excitation pulse energy and repetition frequency is developed and employed to examine the validity of these models. While ABC and SRH fail to explain the charge dynamics in a broad range of conditions, the addition of Auger recombination and trapping to the SRH model enables a quantitative fitting of PLQY maps and low-power PL decay kinetics, and extracting trap concentrations and efficacies. However, PL kinetics at high power are too fast and cannot be explained. The proposed PLQY mapping technique is ideal for a comprehensive testing of theories and applicable to any semiconductor.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Voevodsky Institute of Chemical Kinetics and Combustion
  • Dresden University of Technology
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Den kondenserade materiens fysik
  • Fysikalisk kemi
  • Materialkemi
Originalspråkengelska
Artikelnummer3329
TidskriftNature Communications
Volym12
StatusPublished - 2021 dec
PublikationskategoriForskning
Peer review utfördJa