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Controlling Band-Bending for Perovskite Optoelectronic Devices Using Bismuth-Based Interlayers.

Rubén Serrano-Nieto1,2, Wai Kin Yiu3, Marcin Giza3

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Summary
This summary is machine-generated.

Interface engineering with bismuth-based perovskitoids enhances perovskite solar cell performance by deepening the conduction band. This improves electron transfer and reduces recombination for better optoelectronic devices.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Renewable Energy

Background:

  • Interface engineering is crucial for optimizing perovskite optoelectronic devices like solar cells and LEDs.
  • Interlayers effectively tune energy level alignment, improving charge transfer and reducing recombination.

Purpose of the Study:

  • To investigate bismuth-based perovskitoids as interlayers in perovskite solar cells.
  • To enhance charge carrier dynamics and device performance through interface modification.

Main Methods:

  • Incorporation of bismuth-based perovskitoids as interlayers in a PIN architecture perovskite solar cell.
  • Utilizing C60-fullerene as the electron charge extraction layer.
  • Characterization using X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS).

Main Results:

  • Perovskite solar cells with bismuth-based interlayers showed superior performance compared to those without.
  • The conduction band position of the perovskite layer was deepened by approximately 0.5 eV.
  • XPS and UPS measurements confirmed the band bending induced by the interlayer.

Conclusions:

  • Bismuth-based perovskitoids are effective interlayers for tuning perovskite energy levels.
  • This interface engineering approach significantly boosts perovskite solar cell efficiency.
  • The findings support the development of advanced optoelectronic technologies using tailored perovskite interfaces.