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Updated: Jun 12, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Using Multifunctional Molecular 'Glue' for Bilateral Interface Engineering to Stabilize Perovskite/SnO2 Layers.

Bin Du1, Yuexin Lin2, Weidan Gu1

  • 1School of Materials Science and Engineering, Xi'an Polytechnic University, Xi'an, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

Researchers enhanced perovskite solar cell (PSC) efficiency by modifying the interface with L-isoleucine (L-lle). This interface engineering boosts photoelectric conversion efficiency (PCE) and improves device stability.

Keywords:
crystal growthinterface engineeringperovskite solar cellphotovoltaic performancestability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Perovskite solar cells (PSCs) show high photoelectric conversion efficiency (PCE), exceeding 27%.
  • Interface defects in PSCs hinder performance enhancement.
  • The buried interface between SnO2 and perovskite is critical for PSC performance.

Purpose of the Study:

  • To improve PSC performance and stability by addressing interface defects.
  • To introduce L-isoleucine (L-lle) as an interface modifier.
  • To investigate the mechanism of L-lle at the buried interface.

Main Methods:

  • L-isoleucine (L-lle) was used to modify the interface between SnO2 and perovskite.
  • Chemical bonding and esterification reactions at the interface were analyzed.
  • Performance and long-term stability of modified PSC devices were evaluated.

Main Results:

  • L-lle chemically bonds with lead ions on the perovskite surface.
  • L-lle reacts with SnO2 surface hydroxyl groups, enhancing cross-linking and interface contact.
  • PSC devices modified with L-lle achieved a PCE of 26.15%, compared to 23.54% for control devices.
  • Modified devices retained 92% of initial efficiency after 1200 hours of testing.

Conclusions:

  • L-isoleucine effectively passivates interface defects in PSCs.
  • Interface modification with L-lle significantly enhances both PCE and operational stability.
  • This approach offers a promising strategy for developing high-performance and stable PSCs.