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A Close-Space Fast Nucleation Strategy toward High-Efficiency Perovskite Light-Emitting Diodes.

Xinwen Sun1, Dongliang Ding1, Zhiguo Nie2

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR 999077, China.

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|March 24, 2025
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Summary

A new close-space inverted annealing strategy enhances perovskite nucleation and crystallization for improved light-emitting diodes (PeLEDs). This method boosts external quantum efficiency (EQE) in near-infrared devices, paving the way for commercialization.

Keywords:
close-space inverted annealinghigh external quantum efficiencynear-infrared emissionnucleation dynamicsperovskite light-emitting diodes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Halide perovskite light-emitting diodes (PeLEDs) show promise for next-generation displays.
  • Current PeLEDs are limited by uncontrollable nucleation and crystallization, hindering external quantum efficiency (EQE).
  • Defect centers in perovskite films reduce device performance and stability.

Purpose of the Study:

  • To develop a novel annealing strategy for improved perovskite film formation in PeLEDs.
  • To enhance the nucleation and crystallization process for larger crystal domains and reduced defects.
  • To investigate the impact of the new method on the EQE of near-infrared PeLEDs.

Main Methods:

  • Development of a close-space inverted annealing (CSIA) strategy.
  • Utilizing increased surface temperature and rapid solvent evaporation during annealing.
  • Analysis of perovskite film morphology, crystal domain size, and defect density.

Main Results:

  • CSIA facilitates fast nucleation and formation of uniform perovskite films with larger crystal domains.
  • The method significantly reduces defect centers within the perovskite layer.
  • CSIA-processed PeLEDs achieved a peak external quantum efficiency (EQE) of 25.8% for near-infrared emission.
  • The strategy is compatible with various defect passivation agents.

Conclusions:

  • The close-space inverted annealing (CSIA) strategy effectively controls perovskite nucleation and crystallization.
  • This approach leads to superior perovskite film quality and enhanced PeLED performance, particularly EQE.
  • CSIA presents a viable pathway for advancing the commercialization of high-performance perovskite optoelectronic devices.