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P-N junction01:11

P-N junction

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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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In Situ Interfacial Polymerization Enabling a Dual-Anchor Surface Binding Interlayer for Efficient and Stable

Rongmei Zhao1, Ruohao Wang1, Shifeng Ge1

  • 1Southwest United Graduate School, National Center for International Joint Research of Photoelectric Energy Materials and Application, School of Materials and Energy, Yunnan University, Kunming, China.

Angewandte Chemie (International Ed. in English)
|April 24, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces an in situ polymerization strategy for perovskite solar cells, significantly enhancing stability and efficiency by creating a robust interfacial layer that suppresses defects and improves charge transport. This method boosts device longevity and performance.

Keywords:
defect passivationelectron extractionin situ interfacial polymerizationinverted perovskite solar cellion migration

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Chemical Engineering

Background:

  • Surface defects like iodine vacancies trigger perovskite degradation through ion migration and proton transfer, leading to performance loss.
  • Existing surface passivation techniques often lack strong intermolecular interactions and sufficient stability for long-term perovskite device operation.

Purpose of the Study:

  • To develop a novel in situ interfacial polymerization strategy for enhanced surface passivation of perovskite solar cells.
  • To improve the stability and efficiency of perovskite devices by mitigating degradation pathways and facilitating charge transport.

Main Methods:

  • An in situ interfacial polymerization strategy utilizing room-temperature condensation between amino and acyl chloride groups.
  • Formation of a Poly-PT interlayer with multi-anchoring via hydrogen and coordination bonds for defect suppression.
  • Characterization of the n-type surface, band bending, morphological contact, and environmental/ion migration inhibition.

Main Results:

  • The Poly-PT interlayer doubled binding energy, effectively suppressing surface defects and preventing lattice degradation.
  • Achieved a high power conversion efficiency of 26.12% in inverted perovskite solar cells due to improved electron transport.
  • Demonstrated exceptional device stability: 85% retention after 2300 h of continuous operation and 1680 h of storage at 65°C.

Conclusions:

  • In situ polymerization offers a highly effective solution for surface passivation in perovskite solar cells.
  • The developed Poly-PT interlayer significantly enhances device efficiency and long-term operational stability.
  • This approach holds great potential for fabricating durable, high-performance perovskite-based optoelectronic devices.