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Quantum Tunneling Effect in CsPbBr3 Multiple Quantum Wells.

Partha Maity1, Noor A Merdad2,3, Jehad K El-Demellawi4

  • 1Advanced Membranes and Porous Materials Center (AMPMC), KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia.

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|September 22, 2022
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Summary

Efficient charge carrier extraction in two-dimensional (2D) lead halide perovskite (LHP) quantum wells (QWs) is achieved via quantum tunneling. Varying barrier thickness controls carrier extraction, optimizing photodetector performance.

Keywords:
CsPbBr3 perovskiteQuantum wellcarrier extractionphotodetectorquantum-tunneling effecttransient absorption spectroscopy

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) lead halide perovskites (LHPs) exhibit unique optoelectronic properties due to strong quantum confinement.
  • Efficient charge transport is crucial for optoelectronic device performance.

Purpose of the Study:

  • Investigate charge carrier dynamics at the interface of CsPbBr3 multiple quantum wells (MQWs) and charge transporting layers.
  • Decipher the mechanism of charge carrier extraction from MQWs.
  • Understand the impact of barrier thickness on quantum tunneling and device performance.

Main Methods:

  • Fabrication of CsPbBr3 MQWs with varying barrier (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline - BCP) thickness.
  • Steady-state and time-resolved photoluminescence spectroscopy.
  • Femtosecond transient absorption experiments.
  • Fabrication and characterization of quantum well (QW) photodetector devices.

Main Results:

  • Charge carrier extraction from MQWs to TiO2 and Spiro-OMeTAD occurs via quantum tunneling.
  • Carrier extraction efficiency is dependent on the BCP barrier thickness.
  • Quantum tunneling mechanism was confirmed by spectroscopic techniques.

Conclusions:

  • Quantum tunneling is an effective mechanism for charge carrier extraction in 2D LHP MQWs.
  • Tailoring barrier thickness allows control over carrier extraction and device performance.
  • This study offers insights into optimizing carrier extraction in quantum-confined systems.