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Efficient TiO2 Surface Treatment Using Cs2CO3 for Solution-Processed Planar-Type Sb2S3 Solar Cells.

Wook Hyun Kim1, Sungho Woo2, Kang-Pil Kim1

  • 1Convergence Research Center for Solar Energy, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea.

Nanoscale Research Letters
|January 19, 2019
PubMed
Summary
This summary is machine-generated.

We enhanced antimony trisulfide (Sb2S3) solar cell efficiency using a cesium carbonate (Cs2CO3) surface treatment on the compact titanium dioxide (c-TiO2) layer. This simple method boosts power conversion efficiency for high-performance solar devices.

Keywords:
Cs2CO3Electron transport layerPlanar-type Sb2S3 solar cellSolution processSurface treatment

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Planar-type antimony trisulfide (Sb2S3) solar cells are promising for low-cost renewable energy applications.
  • Optimizing the electron transport layer (ETL) is crucial for improving solar cell performance.
  • Compact titanium dioxide (c-TiO2) is a common ETL material, but its surface properties can limit efficiency.

Purpose of the Study:

  • To develop an effective surface treatment for the c-TiO2 ETL in planar-type Sb2S3 solar cells.
  • To investigate the impact of cesium carbonate (Cs2CO3) on the c-TiO2 surface and its work function.
  • To enhance the power conversion efficiency (PCE) of Sb2S3 solar cells.

Main Methods:

  • A Cs2CO3 solution was used to treat the c-TiO2 layer in a glass/FTO/c-TiO2/Sb2S3/P3HT/Au solar cell structure.
  • Surface characterization techniques were employed to analyze changes in the c-TiO2 layer's work function and surface roughness.
  • Current-voltage (J-V) measurements were performed to determine the PCE of treated and untreated solar cells.

Main Results:

  • Surface treatment with Cs2CO3 solution effectively modified the c-TiO2 ETL.
  • The Cs2CO3 treatment resulted in an upward shift of the c-TiO2 work function.
  • Surface roughness of the c-TiO2 layer was reduced after Cs2CO3 treatment.
  • The PCE of Sb2S3 solar cells significantly improved from 2.83% to 3.97% after the surface treatment.

Conclusions:

  • Cs2CO3 surface treatment is a simple and efficient method to enhance the performance of planar-type Sb2S3 solar cells.
  • Modifying the work function and reducing surface roughness of the c-TiO2 ETL are key to achieving higher PCE.
  • This approach offers a viable strategy for fabricating high-performance Sb2S3 photovoltaic devices.