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High-Quality Solution-Processed Quasi-2D Perovskite for Low-Threshold Lasers.

Kefan Zhao1, Yujing Wang1, Kai Lin1

  • 1College of Physics and Optoelectronics, Key Laboratory of Interface Science and Engineering in Advanced Materials, Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China.

ACS Applied Materials & Interfaces
|April 17, 2024
PubMed
Summary

Controlling solvent evaporation during spin-coating improves quasi-two-dimensional halide perovskite film crystallization. This leads to enhanced laser performance with a lower stimulated emission threshold and faster biexciton recombination for efficient photoluminescence.

Keywords:
amplified spontaneous emissionbiexcitonhigh crystalline qualitylow thresholdperovskite

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Photonics

Background:

  • Quasi-two-dimensional (2D) halide perovskite films are promising for laser applications due to their excellent optoelectronic properties and stability.
  • Film crystallinity is crucial for achieving high laser performance.
  • The precise control of crystallization during spin-coating, particularly the effect of solvent evaporation rate, remains underexplored.

Purpose of the Study:

  • To investigate the impact of solvent evaporation control during spin-coating on the microstructure and crystallization of quasi-2D halide perovskite films.
  • To correlate film crystallinity with optoelectronic properties relevant to laser applications.

Main Methods:

  • Spin-coating of quasi-2D halide perovskite films with controlled solvent evaporation.
  • Microstructural characterization of the perovskite films.
  • Optical characterization, including stimulated emission threshold measurements.
  • Transient absorption spectroscopy to analyze carrier dynamics, specifically biexciton recombination.

Main Results:

  • Optimized solvent evaporation during spin-coating significantly improved the crystallization quality of quasi-2D perovskite films.
  • The prepared films demonstrated a low stimulated emission threshold of 16.2 μJ/cm² at 550 nm.
  • Transient absorption revealed a reduction in radiative biexciton recombination time from 738.5 to 438.3 ps due to enhanced crystallinity.

Conclusions:

  • Controlling solvent evaporation is an effective strategy to enhance the crystallinity of spin-coated quasi-2D perovskite films.
  • Improved crystallinity leads to superior laser performance, evidenced by a lower threshold and faster recombination dynamics.
  • This work provides a pathway for developing high-performance, low-threshold perovskite lasers.