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Iodide Management and Oriented Crystallization Modulation for High-Performance All-Air Processed Perovskite Solar

Haichao Yang1, Zhiyuan Xu1, Huaxin Wang1

  • 1College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|October 25, 2024
PubMed
Summary

Ergothioneine (EGT) effectively manages halide defects and enhances crystallization in perovskite solar cells (PSCs). This strategy boosts power conversion efficiency to 25.13% and improves long-term operational stability.

Keywords:
ISOS protocolall‐air processingall‐in‐one modificationcrystallization manipulationiodide management

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Halide-related defects at the buried interface in perovskite solar cells (PSCs) lead to nonradiative recombination and poor long-term stability.
  • These defects compromise device performance and operational lifetime, hindering commercial viability.

Purpose of the Study:

  • To develop a novel modification strategy for addressing halide-related defects at the buried interface of PSCs.
  • To improve the efficiency and long-term stability of PSCs through interface engineering.

Main Methods:

  • A bottom-up, all-in-one modification strategy was employed, introducing ergothioneine (EGT) at the buried interface.
  • EGT was used to passivate defects, anchor iodide ions, inhibit their oxidation, and manipulate perovskite crystallization dynamics.
  • All-air processed devices were fabricated and characterized for their photovoltaic performance and stability.

Main Results:

  • EGT effectively passivated uncoordinated Sn4+/Pb2+ defects and anchored iodide ions, preventing oxidation to I2.
  • Perovskite crystallization was enhanced, leading to improved carrier dynamics and reduced residual stresses.
  • The optimized PSC achieved a power conversion efficiency (PCE) of 25.13% with a high open-circuit voltage (VOC) of 1.191 V and fill factor (FF) of 84.9%.

Conclusions:

  • The EGT modification strategy significantly enhances the performance and stability of PSCs.
  • The optimized devices demonstrate excellent operational stability under thermal stress and continuous illumination without encapsulation.
  • This approach offers a promising pathway for developing highly efficient and stable perovskite solar cells.