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Related Concept Videos

P-N junction01:11

P-N junction

417
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...
417

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Recent Advances in Wide-Bandgap Perovskite Solar Cells.

Jianjun Mei1, Feng Yan1

  • 1Department of Applied Physics, Research Center for Organic Electronics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, 999077, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 1, 2025
PubMed
Summary

Wide-bandgap perovskite solar cells (PSCs) show promise but degrade due to defects. This review details defect impacts and passivation strategies for improved stability in WBG PSCs.

Keywords:
applicationsdefectsopen‐circuit voltage deficitsphoto‐instabilitysolar cellswide‐bandgap perovskites

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Wide-bandgap perovskite solar cells (WBG PSCs) are promising for semitransparent, tandem, and indoor applications.
  • Defect-mediated degradation, including phase segregation and ion migration, limits WBG PSC stability and performance.
  • Reducing defect densities in bulk, surfaces, and interfaces is crucial for device longevity.

Purpose of the Study:

  • To provide a comprehensive understanding of the intrinsic defect ecosystem in WBG perovskites.
  • To elucidate the impact of defects on WBG PSC stability and open-circuit voltage (Voc) losses.
  • To review recent defect passivation strategies and discuss WBG PSC applications.

Main Methods:

  • Literature review of intrinsic defect properties in WBG perovskites.
  • Mechanistic analysis of defect-induced degradation pathways.
  • Cross-sectional overview of defect passivation techniques across device components.

Main Results:

  • Identified key degradation factors: phase segregation, ion migration, lattice strain, and defect-mediated reactions.
  • Quantified the contraction of quasi-Fermi level splitting (QFLS) due to degradation.
  • Detailed the impact of defects on device stability and open-circuit voltage (Voc) losses.

Conclusions:

  • Effective defect passivation is essential for enhancing WBG PSC stability and performance.
  • WBG PSCs hold significant potential for building-integrated photovoltaics, tandem cells, and indoor energy harvesting.
  • Future research should focus on advanced passivation methods and understanding degradation mechanisms for commercialization.