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Related Concept Videos

Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...

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Updated: Jul 16, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
11:38

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Published on: February 27, 2017

Energy Band Alignment and Interfaces in FAPbI3 Perovskite Solar Cells: A Hard X-ray Photoelectron Spectroscopy

Rahul Mahavir Varma1, Bhavya Rakheja2, Karen Radetzky1,3

  • 1Condensed Matter Physics of Energy Materials, Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala SE-75120, Sweden.

ACS Applied Materials & Interfaces
|July 14, 2026
PubMed
Summary

Optimizing interfaces in perovskite solar cells is crucial. This study reveals chemical interactions at the perovskite/hole transport layer interface, highlighting the impact of transport layer thickness on device performance.

Keywords:
FAPbI3HAXPESinterfacesperovskite solar cellsspiro-OMeTAD

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Interfacial phenomena significantly impact perovskite solar cell (PSC) performance and stability.
  • Optimizing interfaces is a critical challenge for the commercialization of PSCs.

Purpose of the Study:

  • To investigate chemical interactions and electronic structure at the buried FAPbI3 perovskite/spiro-OMeTAD hole transport layer (HTL) interface.
  • To understand how HTL deposition affects the perovskite layer and vice versa.

Main Methods:

  • Hard X-ray photoelectron spectroscopy (HAXPES) was employed to analyze the ITO/SnO2/FAPbI3/HTL device.
  • Core level spectra (Pb 4f, N 1s) were analyzed to identify chemical species and electronic structure.

Main Results:

  • Evidence of Pb and I ion incorporation into the spiro-OMeTAD HTL was observed.
  • New non-perovskite Pb species and chemical modifications in the HTL were detected.
  • A downward band bending in the spiro-OMeTAD HTL was indicated by a shift in the N 1s peak with increasing HTL thickness.

Conclusions:

  • Direct insights into the chemical and electronic interactions at the FAPbI3/HTL interface were obtained.
  • Optimizing HTL thickness is essential for achieving favorable energy level alignment.
  • Improved device performance in perovskite solar cells can be achieved through interface engineering.