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Achieving Efficient Triple-Cation Perovskite Solar Cells with Fill Factor Exceeding 86% via a Uniform Interface

Zhenke Zhong1, Qiming Lei2,3, Jianhui Chang4,5

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We developed a new passivation method for triple-cation perovskite solar cells (PSCs) using CHEAI and a mixed solvent system. This approach enhances both efficiency and stability by creating a uniform 2D perovskite layer, overcoming previous trade-offs.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Chemical Engineering

Background:

  • Interfacial defects in triple-cation perovskite films hinder device performance.
  • Existing passivation methods often compromise between defect coverage and charge transport.

Purpose of the Study:

  • To introduce a uniform interfacial passivation strategy for triple-cation perovskite solar cells (PSCs).
  • To address the trade-off between defect passivation and charge transport using a novel approach.

Main Methods:

  • Utilized 2-(1-cyclohexenyl)ethylammonium iodide (CHEAI) for passivation.
  • Employed a mixed solvent system of chlorobenzene (CB) and isopropanol (IPA) to induce molecular self-assembly.
  • Constructed a uniform two-dimensional (2D) perovskite interfacial layer.

Main Results:

  • Achieved a power conversion efficiency (PCE) of 25.72% and a fill factor (FF) of 86.27%.
  • Demonstrated the highest reported values for conventional two-step method-based triple-cation PSCs.
  • Confirmed the effectiveness of the passivation strategy with different agents.

Conclusions:

  • The CHEAI passivation with CB/IPA mixed solvent system effectively addresses the defect passivation and charge transport trade-off.
  • This method offers a straightforward and effective route to enhance PSC efficiency and stability.
  • The developed strategy shows broad applicability in perovskite solar cell technology.