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Related Concept Videos

P-N junction01:11

P-N junction

738
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...
738
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.2K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.2K

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Updated: Oct 5, 2025

Developing High Performance GaP/Si Heterojunction Solar Cells
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Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells.

Xiaodong Li1, Wenxiao Zhang1, Xuemin Guo1

  • 1School of Physics and Electronic Science, Engineering Research Center of Nanophotonics and Advanced Instrument, Ministry of Education, East China Normal University, Shanghai 200062, China.

Science (New York, N.Y.)
|January 27, 2022
PubMed
Summary

Surface sulfidation of perovskite films created stable heterojunctions for efficient inverted solar cells. This breakthrough enhances power conversion efficiency and device longevity, paving the way for advanced photovoltaic technologies.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Perovskite solar cells offer high power conversion efficiencies but suffer from stability issues.
  • Interface engineering is crucial for optimizing charge extraction and device performance in perovskite solar cells.

Purpose of the Study:

  • To construct a stable perovskite heterojunction for inverted solar cells using surface sulfidation.
  • To investigate the impact of lead-sulfur bonds on the electronic properties and stability of perovskite films.
  • To enhance the performance and operational lifetime of inverted perovskite solar cells.

Main Methods:

  • Fabrication of lead (Pb)-rich perovskite films.
  • Surface treatment via sulfidation to form lead-sulfur (Pb-S) bonds.
  • Characterization of the perovskite interface and electronic properties.
  • Fabrication and testing of inverted solar cell devices.
  • Long-term stability testing under thermal and illumination stress.

Main Results:

  • Successful construction of a stable perovskite heterojunction through surface sulfidation.
  • Formation of Pb-S bonds upshifted the Fermi level and induced a back-surface field for improved electron extraction.
  • Achieved power conversion efficiency (PCE) exceeding 24% with a high open-circuit voltage of 1.19 V.
  • Demonstrated enhanced device stability, retaining over 90% of initial PCE after 2200 hours of aging at 85°C or 1000 hours of continuous operation.
  • Observed stabilization of perovskite heterojunctions and strengthening of underlying perovskite structures.

Conclusions:

  • Surface sulfidation is an effective strategy for creating stable perovskite heterojunctions in inverted solar cells.
  • The Pb-S bonds play a critical role in enhancing device performance and long-term stability.
  • This approach significantly reduces voltage loss and improves the operational lifetime of perovskite photovoltaic devices.