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Related Experiment Video

Updated: Apr 2, 2026

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Enhanced Wide-Bandgap Perovskite Solar Cells via Kinetically Optimized C60 Electron-Transport Layers.

Naveen Kumar1, Hyo Jeong Jo1, Dae-Ho Son1

  • 1Division of Energy & Environmental Technology, Daegu-Gyeongbuk Institute of Science and Technology (DGIST), Daegu, Korea.

Chemsuschem
|April 1, 2026
PubMed
Summary

Controlling fullerene electron-transport layer (ETL) deposition kinetics enhances wide-bandgap perovskite solar cells. Slowing C60 deposition minimizes recombination and voltage losses, boosting power conversion efficiency (PCE) without complex strategies.

Keywords:
C60deposition kinetics controlnonradiative recombination suppressiontandem solar cellswide‐bandgap perovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • High-efficiency tandem solar cells depend on wide-bandgap (WBG) perovskites.
  • WBG perovskites face challenges like nonradiative recombination, voltage losses, and halide segregation.
  • Existing solutions involve complex passivation strategies.

Purpose of the Study:

  • To investigate the impact of fullerene electron-transport layer (ETL) deposition kinetics on WBG perovskite solar cells.
  • To optimize ETL deposition for improved device performance and stability.
  • To overcome common issues in WBG perovskite solar cells without complex passivation.

Main Methods:

  • Fabrication of WBG perovskite solar cells (FA0.8Cs0.2Pb(I0.8Br0.2)3 absorber) in a p-i-n architecture.
  • Controlled deposition of C60 ETLs at varying evaporation rates (specifically 0.1 Å s-1).
  • Characterization using photoluminescence, impedance spectroscopy, transient photovoltage, and structural analysis.

Main Results:

  • Slower C60 deposition (0.1 Å s-1) yielded a 20.4% power conversion efficiency (PCE).
  • Devices exhibited suppressed nonradiative recombination, reduced shunt leakage, and a lower Voc deficit (~0.48 eV).
  • Improved performance metrics include higher open-circuit voltage (~1.17 V), increased fill factor (80%), reduced saturation current density, and lower trap-state density.

Conclusions:

  • Controlling ETL deposition kinetics is a simple yet effective strategy for high-performance WBG perovskite solar cells.
  • Slow C60 deposition leads to a compact, well-ordered ETL, minimizing recombination and improving device characteristics.
  • This approach offers valuable insights for the scalable fabrication of efficient tandem solar cells.