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Transport Layer Engineering Toward Lower Threshold for Perovskite Lasers.

Jia Zhang1,2, Jiajun Qin1, Weidong Cai1

  • 1Department of Physics, Chemistry and Biology, Linköping University, Linköping, 58183, Sweden.

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Summary

Adding a poly(triaryl amine) (PTAA) hole transport layer significantly lowers the amplified spontaneous emission (ASE) threshold in perovskite films. This enhancement is achieved by accelerating hot-carrier cooling and suppressing Auger recombination loss, crucial for electrically pumped perovskite lasers.

Keywords:
ASE thresholdhole extractionhot-carrier coolingoptical gaintransport layer engineering

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid State Physics

Background:

  • Charge-transport layers are critical components in optoelectronic devices, particularly for enabling electrically pumped perovskite lasers.
  • The precise mechanisms by which these layers influence perovskite lasing dynamics remain incompletely understood.

Purpose of the Study:

  • To investigate the role of charge-transport layers in perovskite lasing by examining amplified spontaneous emission (ASE) thresholds.
  • To explore methods for reducing the ASE threshold and enhancing lasing efficiency in perovskite films.

Main Methods:

  • Investigated amplified spontaneous emission (ASE) thresholds in perovskite films with and without an additional poly(triaryl amine) (PTAA) hole transport layer.
  • Analyzed the effect of pumping wavelength on ASE thresholds to understand hot-carrier dynamics.
  • Correlated charge-transport layer properties with hot-carrier cooling and recombination processes.

Main Results:

  • Introduction of a PTAA layer significantly reduced the ASE threshold and increased ASE intensity.
  • The PTAA layer was shown to accelerate hot-carrier cooling by efficiently extracting holes from the perovskite.
  • Auger recombination losses were suppressed due to reduced hot-hole populations, leading to a lower ASE threshold.
  • Switching the pumping wavelength from 400 nm to 500 nm further decreased the ASE threshold from 25.7 to 7.2 µJ cm⁻², confirming the role of hot-hole generation.

Conclusions:

  • Transport layer engineering, specifically through hot-hole manipulation, is an effective strategy to reduce ASE thresholds in perovskites.
  • Accelerating hot-carrier cooling via hole extraction is key to suppressing Auger recombination and improving lasing performance.
  • This work provides critical insights for developing efficient electrically pumped perovskite lasers by optimizing gain properties through charge-transport layer modification.