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Vertically Aligned One-Dimensional Crystal-Structured Sb2Se3 for High-Efficiency Flexible Solar Cells via Regulating

Xixing Wen1,2, Zonghuan Lu2, Xuke Yang3

  • 1College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), State Key Laboratory of Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu 210023, P. R. China.

ACS Applied Materials & Interfaces
|May 1, 2023
PubMed
Summary

Researchers achieved precise control over antimony selenide (Sb2Se3) film orientation for flexible solar cells. This breakthrough enhances device efficiency and open-circuit voltage, paving the way for advanced photoelectric applications.

Keywords:
Sb2Se3flexible solar cellsone-dimensional crystal-structured materialsopen-circuit voltageorientation control

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Nanotechnology

Background:

  • Antimony selenide (Sb2Se3) shows promise for flexible electronics due to its 1D structure and optoelectronic properties.
  • Controlling crystalline orientation, particularly the vertical (001) orientation, is crucial for optimizing Sb2Se3 device performance.
  • Current methods struggle with precise orientation control, limiting device efficiency.

Purpose of the Study:

  • To achieve unprecedented control over the (001) orientation of Sb2Se3 films on flexible substrates.
  • To investigate the impact of controlled orientation on the performance of flexible Sb2Se3 solar cells.
  • To elucidate the mechanisms behind improved device performance resulting from the (001) orientation.

Main Methods:

  • Regulating selenization kinetics to balance Se vapor particle collision rate and kinetic energy on an Sb film surface.
  • Utilizing a flexible Mo-coated mica substrate for Sb2Se3 film growth.
  • Characterizing the film's crystalline orientation and device performance.

Main Results:

  • Achieved unprecedented control of (001) orientation in Sb2Se3 films on flexible Mo-coated mica.
  • Fabricated flexible Sb2Se3 solar cells with a record 8.42% efficiency and 0.47 V open-circuit voltage (VOC).
  • Observed formation of a MoSe2 interlayer and Se-rich state, enhancing the absorber layer and back contact.

Conclusions:

  • Controlled (001) orientation of Sb2Se3 films significantly boosts flexible solar cell performance.
  • The vertical van der Waals gaps in the (001) orientation facilitate Se diffusion and interlayer formation.
  • This strategy offers a pathway for developing high-performance flexible photoelectric devices using 1D materials.