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Controlled Growth of BiSI Nanorod-Based Films Through a Two-Step Solution Process for Solar Cell Applications.

Yong Chan Choi1, Eunjeong Hwang1

  • 1Division of Energy Technology, DGIST, Daegu 42988, Korea.

Nanomaterials (Basel, Switzerland)
|November 24, 2019
PubMed
Summary

Bismuth oxyhalide (BiSI) solar cells offer a lead-free alternative to perovskites. A new two-step solution method fabricates efficient BiSI films with tunable properties for enhanced solar energy conversion.

Keywords:
Bi2S3BiSIbismuth chalcohalidessolar cellssolution processthiol-amine

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Chemistry

Background:

  • Lead-based perovskite solar cells face commercialization challenges.
  • Bismuth-based chalcohalides are emerging as potential lead-free alternatives.
  • Current bismuth-based solar cell efficiencies require improvement.

Purpose of the Study:

  • To develop a novel two-step solution method for fabricating bismuth iodosulfide (BiSI) films.
  • To investigate the influence of fabrication parameters on BiSI film properties.
  • To explore the electronic structure of BiSI for solar cell applications.

Main Methods:

  • Fabrication of bismuth sulfide (Bi2S3) via a thiol-amine solution process (Step I).
  • Conversion of Bi2S3 to BiSI through chemical reaction with bismuth iodide (BiI3) (Step II).
  • Optimization of Bi:S molar ratio and Step I repetitions for BiSI formation.

Main Results:

  • Successfully fabricated BiSI films using the developed two-step solution method.
  • Identified Bi:S molar ratio and Step I repetitions as critical factors for BiSI formation.
  • Characterized BiSI films with an optical band gap of 1.61 eV and nanorod morphology.

Conclusions:

  • The two-step solution method provides a viable route for BiSI film fabrication.
  • Optimized BiSI films show promise for future solar cell applications.
  • Further research into electronic structure is crucial for device optimization.