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Protective Coating Interfaces for Perovskite Solar Cell Materials: A First-Principles Study.

Azimatu Fangnon1, Marc Dvorak1, Ville Havu1

  • 1Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland.

ACS Applied Materials & Interfaces
|March 4, 2022
PubMed
Summary
This summary is machine-generated.

Protecting halide perovskites like CsPbI₃ is key for optoelectronics. ZnO, SrZrO₃, and ZrO₂ coatings were studied, with ZrO₂ showing potential as an electron transport layer after interface engineering.

Keywords:
Bayesian optimizationcoatingdensity functional theoryinterfacelevel alignmentperovskitesurfacetransport layer

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Quantum Chemistry

Background:

  • Halide perovskites are crucial for advanced optoelectronic devices.
  • Ensuring the stability and performance of perovskite materials requires effective protective coatings.
  • Cesium lead iodide (CsPbI₃) is a key perovskite material facing stability challenges.

Purpose of the Study:

  • To investigate inorganic protective coatings (ZnO, SrZrO₃, ZrO₂) for CsPbI₃ perovskite.
  • To determine optimal interface configurations using Bayesian optimization.
  • To analyze the electronic properties and band alignment at the coating-CsPbI₃ interfaces.

Main Methods:

  • Bayesian optimization for identifying optimal interface registries.
  • Semilocal density functional theory (DFT) for atomic structure determination.
  • Hybrid DFT calculations for exploring interface electronic level alignment.

Main Results:

  • Identified optimal interface registries for ZnO, SrZrO₃, and ZrO₂ on CsPbI₃.
  • Analyzed atomic structures at interfaces with clean and reconstructed CsPbI₃ surfaces.
  • Found no detrimental mid-gap states, but substrate-dependent band offsets.
  • ZnO and SrZrO₃ function as insulators, while ZrO₂ shows potential as an electron transport layer.

Conclusions:

  • ZnO and SrZrO₃ coatings act as effective insulators for CsPbI₃.
  • ZrO₂ demonstrates promise as an electron transport layer for CsPbI₃, contingent on interface engineering.
  • The findings guide the selection and design of protective coatings for perovskite optoelectronics.