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Large-Grained Cu2BaSnS4 Films for Photocathodes.

Juan Xie1, Qinghua Yi2, Fayun Zhang3

  • 1School of Physical Science and Technology, College of Energy, Soochow Institute for Energy and Materials Innovations and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province , Soochow University , Suzhou 215006 , China.

ACS Applied Materials & Interfaces
|August 7, 2019
PubMed
Summary
This summary is machine-generated.

Copper barium tin sulfide (CBTS) films were synthesized using an inexpensive aqueous method. These films exhibit large crystalline grains and high carrier mobility, achieving significant photocurrent density for photocathode applications.

Keywords:
CuBaSnSaqueous solutionmicron sized grainsphotocathodespolycrystalline films

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Semiconductor Physics

Background:

  • p-Type Copper barium tin sulfide (CBTS) compounds are promising for photocathode applications due to favorable band structures and earth-abundant, eco-friendly composition.
  • Existing synthesis methods may not be cost-effective or scalable.

Purpose of the Study:

  • To develop an inexpensive and reproducible aqueous solution approach for synthesizing high-quality CBTS films.
  • To evaluate the performance of CBTS films in photocathode applications.

Main Methods:

  • Synthesis of CBTS films via an aqueous solution method.
  • Characterization of film crystallinity and grain size (micron scale).
  • Measurement of carrier mobility and photocurrent density.

Main Results:

  • Achieved single-crystalline CBTS films with large micron-scale grains.
  • Demonstrated excellent carrier mobility of 1.29 cm²/V·s.
  • Obtained a photocurrent density greater than 4 mA·cm⁻² for bare Mo/CBTS photocathodes in neutral solution under illumination.

Conclusions:

  • The developed aqueous synthesis method is effective for producing high-performance CBTS films.
  • The large crystalline grains contribute to enhanced carrier mobility and photocathode performance.
  • CBTS is a viable material for efficient and cost-effective photocathode development.