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Tailoring Carrier Dynamics by Band Alignment Engineering in Quasi-2D Perovskite LED.

Song Zheng1, Qixin Huang1, Weifan Niu1

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|October 22, 2025
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Summary

Optimizing phase distribution in quasi-2D perovskite films using crown ether altered band alignment from type II to type I. This engineering enhanced optoelectronic device performance, boosting light-emitting diode efficiency.

Keywords:
carrier dynamicslead halide perovskiteslight emitting diodesluminescenceoptical materials

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Optoelectronics

Background:

  • Semiconductor band alignment is critical for optoelectronic device efficiency.
  • The effect of phase distribution on band alignment in quasi-2D lead halide perovskites was previously unreported.

Purpose of the Study:

  • To investigate the impact of phase distribution on band alignment and carrier dynamics in quasi-2D perovskites.
  • To engineer band alignment by optimizing phase distribution in (PEA)2CsPb2I7 films.

Main Methods:

  • Utilized crown ether addition to tune phase distribution in (PEA)2CsPb2I7 quasi-2D films.
  • Experimentally characterized changes in band alignment, electron-phonon coupling, and exciton binding energy.

Main Results:

  • Achieved band alignment engineering from type II to type I by narrowing phase distribution.
  • Observed enhanced electron-phonon coupling, increased exciton binding energy, accelerated hot carrier cooling, and suppressed Auger recombination.
  • Demonstrated improved external quantum efficiency from 7.4% to 20.1% in fabricated light-emitting diodes.

Conclusions:

  • Optimizing phase distribution is an effective strategy for band alignment engineering in quasi-2D perovskites.
  • This approach significantly enhances optoelectronic device performance, particularly for light-emitting diodes.