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Halide Engineering in Mixed Halide Perovskite-Inspired Cu2AgBiI6 for Solar Cells with Enhanced Performance.

Vipinraj Sugathan1, Maning Liu1, Adriana Pecoraro2

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Summary

Doping copper silver bismuth iodide (Cu2AgBiI6) with bromide anions enhances solar cell performance by reducing defects. This halide engineering strategy boosts power conversion efficiency by over 30%.

Keywords:
Cu2AgBiI6efficiencyhalide engineeringperovskite-inspired materialssolar cellstraps

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Copper silver bismuth iodide (Cu2AgBiI6 or CABI) is a perovskite-inspired material with potential for solar cells due to its favorable optoelectronic properties.
  • High extrinsic trap density in CABI leads to nonradiative recombination, limiting its power conversion efficiency (PCE).

Purpose of the Study:

  • To improve the performance of CABI-based solar cells by mitigating trap states through halide engineering.
  • To investigate the effect of bromide anion (Br-) incorporation on the optoelectronic properties and photovoltaic performance of CABI thin films.

Main Methods:

  • Halide engineering: Doping CABI thin films with bromide anions (Br-) during the synthesis process.
  • Compositional analysis: Identifying the optimal composition as CABI-10Br (10% Br at the halide site).
  • Characterization techniques: Time-resolved photoluminescence and transient absorption spectroscopy to assess trap density and charge carrier dynamics.
  • Device performance evaluation: Measuring photovoltaic parameters, including power conversion efficiency (PCE), external quantum efficiency, and short-circuit current under 1 sun illumination.

Main Results:

  • Bromide incorporation significantly reduces deep trap density in CABI thin films.
  • The optimized CABI-10Br composition leads to a substantial increase in charge carrier lifetime.
  • External quantum efficiency and short-circuit current show marked improvements.
  • Power conversion efficiency (PCE) increased from 1.32% to 1.69% (a relative enhancement of ~30%).

Conclusions:

  • Bromide incorporation is an effective strategy for mitigating trap states in lead-free perovskite-inspired materials like CABI.
  • Halide engineering of CABI thin films can significantly enhance photovoltaic device performance.
  • The study demonstrates a promising route for developing efficient and stable CABI-based solar cells.