Quantum Tunneling Effect in CsPbBr3Multiple Quantum Wells

Partha Maity, Noor A. Merdad, Jehad K. El-Demellawi, Luis Gutiérrez-Arzaluz, Zhixiong Liu, Rounak Naphade, Husam N. Alshareef, Osman M. Bakr, Omar F. Mohammed*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Two-dimensional (2D) lead halide perovskites (LHPs) have garnered incredible attention thanks to their exciting optoelectronic properties and intrinsic strong quantum confinement effect. Herein, we carefully investigate and decipher the charge carrier dynamics at the interface between CsPbBr3multiple quantum wells (MQWs) as the photoactive layer and TiO2and Spiro-OMeTAD as electron and hole transporting materials, respectively. The fabricated MQWs comprise three monolayers of CsPbBr3separated by 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) as barriers. By varying the BCP thickness, we show that charge carrier extraction from MQWs to the corresponding extracting layer occurs through a quantum tunneling effect, as elaborated by steady-state and time-resolved photoluminescence measurements and further verified by femtosecond transient absorption experiments. Ultimately, we have investigated the impact of the barrier-thickness-dependent quantum tunneling effect on the photoelectric behavior of the synthesized QW photodetector devices. Our findings shed light on one of the most promising approaches for efficient carrier extraction in quantum-confined systems.

Original languageEnglish (US)
Pages (from-to)7936-7943
Number of pages8
JournalNano Letters
Volume22
Issue number19
DOIs
StatePublished - Oct 12 2022

Bibliographical note

Funding Information:
This work was supported by the King Abdullah University of Science and Technology (KAUST).

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Keywords

  • carrier extraction
  • CsPbBrperovskite
  • photodetector
  • Quantum well
  • quantum-tunneling effect
  • transient absorption spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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