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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...
1.7K

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Related Experiment Video

Updated: May 6, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Bilayer Hole-Selective Contact Enhancing Hole Extraction for Efficient Inverted Wide-Bandgap Perovskite Solar Cells.

Zhengming Ma1, Shenghan Wu1, Xinxing Yin2

  • 1College of Materials Science and Engineering & Institute of New Energy and Low-Carbon Technology & Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education, Sichuan University, Chengdu 610065, China.

ACS Applied Materials & Interfaces
|May 4, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel bilayer hole-selective contact for wide-bandgap perovskite solar cells, enhancing efficiency and stability. The new contact improves perovskite crystallization and device performance, paving the way for advanced tandem solar cells.

Keywords:
Perovskite solar cellsbilayer hole-selective layerdefect passivationefficient hole extractionself-assembled monolayers

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Wide-bandgap perovskite solar cells are key for efficient tandem solar cells.
  • Current hole-transport materials like nickel oxide (NiOX) and self-assembled monolayers (SAMs) have limitations in conductivity, stability, and defect density.
  • Addressing these limitations is crucial for advancing perovskite solar technology.

Purpose of the Study:

  • To develop an improved hole-selective contact for wide-bandgap perovskite solar cells.
  • To overcome the stability and efficiency constraints associated with conventional hole-transport materials.
  • To enhance perovskite crystallization and device performance through a novel bilayer contact.

Main Methods:

  • Fabrication of a bilayer hole-selective contact using NiOX and a 9H,9'H-[3,3'-bicarbazole]-9,9'-diylbis(butane-4,1-diyl) diphosphonic acid (DCZ) SAM molecule.
  • Integration of the bilayer contact into wide-bandgap perovskite solar cells with varying bandgaps (1.77 eV, 1.68 eV, 1.58 eV).
  • Performance characterization including power conversion efficiency (PCE), open-circuit voltage (VOC), and long-term stability testing under continuous illumination.

Main Results:

  • The champion device with a 1.77 eV perovskite achieved a power conversion efficiency (PCE) of 19.24% and an open-circuit voltage (VOC) of 1.31 V.
  • The bilayer contact facilitated improved hole extraction and perovskite crystallization.
  • The device retained 80% of its initial efficiency after 380 hours of continuous illumination, demonstrating enhanced stability.
  • The approach was successfully extended to perovskite systems with bandgaps of 1.68 eV and 1.58 eV, yielding PCEs of 22.92% and 24.93%, respectively.

Conclusions:

  • The proposed bilayer hole-selective contact effectively enhances the efficiency and stability of wide-bandgap perovskite solar cells.
  • This novel contact strategy offers a promising solution for overcoming the limitations of conventional hole-transport materials.
  • The findings pave the way for the development of highly efficient and durable perovskite-based tandem solar cells.