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Related Concept Videos

P-N junction01:11

P-N junction

717
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...
717

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Ge Bidirectional Diffusion to Simultaneously Engineer Back Interface and Bulk Defects in the Absorber for Efficient

Jinlin Wang1,2, Jiazheng Zhou1,2, Xiao Xu1,2

  • 1Beijing National Laboratory for Condensed Matter Physics, Renewable Energy Laboratory, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing, 100190, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|May 6, 2022
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Summary

A thin GeO2 layer boosts copper zinc tin sulfide selenide solar cell performance by reducing defects and improving interfaces. This strategy achieves a 13.14% power conversion efficiency, addressing open-circuit voltage deficits.

Keywords:
CZTSSe solar cellsGe dopingV OC deficitbidirectional diffusionsynergistic effect

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Copper zinc tin sulfide selenide (CZTSSe) solar cells suffer from a large open-circuit voltage (VOC) deficit.
  • Defects in the bulk absorber and at the back interface limit CZTSSe solar cell performance.

Purpose of the Study:

  • To develop a strategy for simultaneously regulating the back interface and reducing bulk defects in CZTSSe absorbers.
  • To enhance the performance of CZTSSe solar cells by addressing VOC deficits.

Main Methods:

  • A thin GeO2 layer was directly introduced on Mo substrates before CZTSSe absorber fabrication.
  • Ge bidirectional diffusion into the CZTSSe absorber and MoSe2 layer was investigated during selenization.
  • The effects of Ge doping on defect density, band tailing, and quasi-Fermi level splitting were analyzed.

Main Results:

  • The champion device achieved a power conversion efficiency (PCE) of 13.14% with a VOC of 547 mV.
  • Ge diffusion into the CZTSSe absorber reduced defect density and band tailing, increasing hole concentration.
  • Ge incorporation into MoSe2 enhanced its work function, improving photoinduced carrier separation.

Conclusions:

  • The GeO2 layer effectively passivates bulk defects and optimizes the back interface through synergistic Ge diffusion.
  • This approach offers a simple method for fabricating high-performance CZTSSe solar cells.
  • The study demonstrates the potential of Ge doping for improving CZTSSe solar cell efficiency.