Shallow defects and variable photoluminescence decay times up to 280 µs in triple-cation perovskites

Quantifying recombination in halide perovskites is a crucial prerequisite to control and improve the performance of perovskite-based solar cells. While both steady-state and transient photoluminescence are frequently used to assess recombination in perovskite absorbers, quantitative analyses within a consistent model are seldom reported. We use transient photoluminescence measurements with a large dynamic range of more than ten orders of magnitude on triple-cation perovskite films showing long-lived photoluminescence transients featuring continuously changing decay times that range from tens of nanoseconds to hundreds of microseconds. We quantitatively explain both the transient and steady-state…

• DF
  Deutsche Forschungsgemeinschaft
• FJ
  Forschungszentrum Jülich
• HA
  Helmholtz Association