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Improving the Success Rate of Protein Crystallization by Random Microseed Matrix Screening
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Orientation Engineering in Low-Dimensional Crystal-Structural Materials via Seed Screening.

Kanghua Li1, Chao Chen1, Shuaicheng Lu1

  • 1Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO), School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|September 26, 2019
PubMed
Summary

Controlling the orientation of low-dimensional crystal-structural (LDCS) films is key for solar cell performance. A new seed screening method successfully oriented antimony selenide (Sb2Se3) films, achieving a record 7.62% solar cell efficiency.

Keywords:
Sb2Se3low-dimensional materialsorientation controlseed screeningsolar cells

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Thin Film Technology

Background:

  • Film orientation critically impacts photoelectric device performance, especially in vertical conducting devices like solar cells.
  • Film growth is governed by initial seed orientation, influenced by substrate bonding forces (van der Waals vs. covalent).

Purpose of the Study:

  • To develop a universal model for controlling the orientation of low-dimensional crystal-structural (LDCS) films.
  • To enhance the performance of antimony selenide (Sb2Se3) based photoelectric devices through controlled film orientation.

Main Methods:

  • Utilized a seed screening model based on minimum energy principles and substrate temperature manipulation.
  • Employed high substrate temperatures to selectively re-evaporate less stable, lying seeds, preserving standing seeds.
  • Grew 1D crystal-structural Sb2Se3 films on inert TiO2 substrates.

Main Results:

  • Achieved highly [211]- and [221]-oriented Sb2Se3 films on TiO2 substrates.
  • Demonstrated a record power conversion efficiency of 7.62% for TiO2/Sb2Se3 solar cells.
  • Validated the effectiveness of the seed screening model for orientation control.

Conclusions:

  • The developed seed screening model offers an effective strategy for controlling LDCS film orientation.
  • This approach can be generalized for orientation control in various LDCS films.
  • Optimized film orientation significantly boosts solar cell efficiency.