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Enabling full-scale grain boundary mitigation in polycrystalline perovskite solids.

Lichen Zhao1,2, Pengyi Tang3,4, Deying Luo1

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Researchers mitigated grain boundaries (GBs) in perovskite solar cells (PSCs) using a novel brominated arylamine trimer. This approach enhances device efficiency and long-term stability by reducing nonradiative recombination.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Nanotechnology

Background:

  • Polycrystalline perovskites contain numerous interaggregate and intra-aggregate grain boundaries (GBs).
  • Both types of GBs negatively impact the performance of perovskite solar cells (PSCs).
  • Effective mitigation strategies for intra-aggregate GBs are crucial for improving PSCs.

Purpose of the Study:

  • To achieve full-scale mitigation of grain boundaries (GBs) in perovskite films, from nanoscale intra-aggregate to submicron-scale interaggregate.
  • To enhance the photovoltaic performance and long-term stability of perovskite solar cells (PSCs).
  • To explore a novel approach for fabricating high-quality solution-processed polycrystalline perovskites.

Main Methods:

  • Modulating perovskite crystallization kinetics using a designed brominated arylamine trimer.
  • Applying the strategy to mesostructured perovskite solar cells (PSCs).
  • Testing the versatility of the strategy across different PSC categories.

Main Results:

  • Successfully mitigated both intra-aggregate and interaggregate GBs in perovskite films.
  • Achieved reduced nonradiative recombination in the optimized perovskite films.
  • Demonstrated substantially enhanced device efficiency and long-term stability (under illumination, humidity, and heat stress) in mesostructured PSCs.

Conclusions:

  • The developed brominated arylamine trimer effectively mitigates GBs across multiple scales.
  • This strategy offers a new perspective for fundamental nanoscale studies of perovskites.
  • Opens a viable route for producing high-quality solution-processed polycrystalline perovskites for advanced optoelectronic devices.