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Solution-Crystalized AgBiS2 Films for Solar Cells Generating a Photo-Current Density Over 31 mA cm-2.

Ludmila Cojocaru1,2, Ajay Kumar Jena2, Miwako Yamamiya1

  • 1Toin University of Yokohama, Kanagawa, 225-8503, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 9, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed an eco-friendly infrared absorber using solution-processed silver bismuth sulfide (AgBiS2) for solar cells. This stable AgBiS2 film achieves high current density and a record 5.15% efficiency for solution-crystallized films.

Keywords:
AgBiS2 absorberAgBiS2 solar cellshigh currentsimple solution coatingsolution‐crystallized

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Perovskite solar cells (PSCs) often use toxic heavy metal absorbers.
  • There is a need for environmentally friendly and efficient alternative absorbers.

Purpose of the Study:

  • To develop a simple solution-processed, environmentally friendly infrared absorber.
  • To investigate the properties and performance of silver bismuth sulfide (AgBiS2) films in solar cells.

Main Methods:

  • Solution-crystallization of AgBiS2 films via spin-coating precursor solutions (silver, bismuth nitrates, thiourea in DMF).
  • Optimization of precursor concentrations, film thickness, and substrates.
  • Fabrication of AgBiS2 absorber layers in a gradient fashion.

Main Results:

  • Successfully produced 250 nm thick AgBiS2 films with varying crystal sizes.
  • Achieved high current density (>31 mA cm-2) in solar cells using the AgBiS2 absorber.
  • Demonstrated high device stability under illumination and prolonged dark storage (>6 months).
  • Attained a record power conversion efficiency of 5.15% for gradient AgBiS2 films.

Conclusions:

  • Solution-processed AgBiS2 is a promising, stable, and eco-friendly alternative absorber for solar cells.
  • Gradient fabrication enhances the efficiency of AgBiS2-based solar cells.
  • This work paves the way for sustainable and high-performance photovoltaic devices.