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P-N junction01:11

P-N junction

469
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...
469

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Standing 1D Chains Enable Efficient Wide-Bandgap Selenium Solar Cells.

Qingxiang Liu1,2, Xia Wang3, Zongbao Li4

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers enhanced selenium (Se) solar cells by controlling crystal orientation for better carrier transport. This breakthrough achieved a record 8.1% power conversion efficiency and excellent stability.

Keywords:
depositionorientationphotovoltaicsseleniumthin film

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Solid-State Physics

Background:

  • Selenium (Se) is a promising photovoltaic material due to its wide bandgap, stability, and non-toxicity.
  • Traditional Se films exhibit poor carrier transport because of their low-energy lying crystal orientation.
  • This orientation hinders efficient charge movement across weak van der Waals bonds between Se chains.

Purpose of the Study:

  • To develop a method for growing selenium films with improved carrier transport properties.
  • To enhance the power conversion efficiency and stability of selenium-based solar cells.
  • To overcome the limitations of lying-oriented Se crystal structures in photovoltaic applications.

Main Methods:

  • Introduced a substrate-heating strategy to promote interfacial bonding between Se and the substrate.
  • Facilitated the growth of selenium films with a standing orientation (chains perpendicular to the substrate).
  • Measured carrier mobility and power conversion efficiency of the fabricated Se solar cells.

Main Results:

  • Achieved standing-oriented Se films with significantly enhanced carrier transport along covalently bonded chains.
  • Demonstrated a fourfold increase in carrier mobility compared to lying-oriented Se films.
  • Attained a record power conversion efficiency of 8.1% under standard 1-sun illumination (AM1.5G).

Conclusions:

  • The substrate-heating strategy effectively enables standing-oriented Se growth for superior photovoltaic performance.
  • The new Se solar cells show excellent stability, with negligible efficiency loss after 1000 hours of ambient storage.
  • This work highlights the potential of oriented selenium films for high-efficiency, stable, and non-toxic solar energy conversion.