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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Buried Interface Passivation with Sulfonic Acid-Based Co-Assembled Monolayer Enables High-Performance Inverted

Changshan Bu1,2, Aiqing Sun2, Li'e Mo2

  • 1Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, P. R. China.

ACS Applied Materials & Interfaces
|December 30, 2025
PubMed
Summary

A new coself-assembled monolayer (Co-SAM) strategy enhances perovskite solar cell (PSC) performance and stability. This approach minimizes defects and recombination, boosting power conversion efficiency (PCE) and device longevity.

Keywords:
4-Fluorobenzenesulfonic Acidcoself-assembled monolayerinterface modificationnonradiative recombinationperovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Interfacial engineering is crucial for high-performance perovskite solar cells (PSCs).
  • Self-assembled monolayers (SAMs) are promising for hole-transporting layers (HTLs) but face challenges like aggregation and recombination.
  • Defects at the HTL-perovskite interface limit PSC efficiency and stability.

Purpose of the Study:

  • To develop a novel synergistic coself-assembled monolayer (Co-SAM) for improved PSC performance.
  • To address interfacial recombination losses and enhance device stability.
  • To investigate the role of 4-Fluorobenzenesulfonic Acid (4FBSA) and Me-4PACz in defect passivation and energy level alignment.

Main Methods:

  • Fabrication of a Co-SAM using 4FBSA and Me-4PACz on a NiOx substrate.
  • Characterization of the monolayer structure, wetting properties, and defect passivation mechanisms.
  • Performance evaluation of PSCs incorporating the Co-SAM, including power conversion efficiency (PCE) and long-term stability tests.

Main Results:

  • The Co-SAM strategy resulted in a uniform and compact monolayer, suppressing Me-4PACz aggregation.
  • 4FBSA effectively passivated undercoordinated Pb2+ defects and mitigated halide vacancy defects.
  • The modified interface promoted charge transport and optimized energy level alignment, reducing nonradiative recombination.
  • Achieved a champion PCE of 24.37% and retained 83.1% efficiency after 400 hours of operation under ambient conditions.

Conclusions:

  • The synergistic Co-SAM approach significantly enhances PSC performance and operational stability.
  • Interfacial defect passivation and improved charge dynamics are key to achieving high PCE.
  • This strategy offers a promising pathway for developing stable and efficient perovskite solar cells.