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Investigation of Polymer/Si Thin Film Tandem Solar Cell Using TCAD Numerical Simulation.

Mohamed Okil1, Ahmed Shaker2, Mostafa M Salah3

  • 1Department of Basic Engineering Sciences, Benha Faculty of Engineering, Benha University, Benha 13512, Egypt.

Polymers
|May 13, 2023
PubMed
Summary

This study presents a polymer/silicon tandem solar cell (TSC) achieving 28.41% power conversion efficiency (PCE) through optimized thin-film design. This advancement shows promise for efficient solar energy conversion in wearable electronics.

Keywords:
TCAD simulationTandem solar cellVBOall-thin-filmc-Sicurrent matchingpolymer-based cell

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Tandem solar cells (TSCs) offer enhanced efficiency by stacking multiple light-absorbing layers.
  • Polymer/silicon tandem configurations are promising for high-performance solar energy conversion.

Purpose of the Study:

  • To design and simulate a two-terminal (2T) thin-film tandem solar cell (TSC) combining a polymer top cell and a crystalline silicon (c-Si) bottom cell.
  • To optimize the TSC performance by tuning parameters such as valence band offset (VBO), defect density, and layer thicknesses.
  • To assess the feasibility of this all thin-film TSC for wearable electronics applications.

Main Methods:

  • Utilized TCAD simulations with the Silvaco Atlas package.
  • Calibrated individual sub-cell performance against experimental data.
  • Optimized the polymer top cell's VBO and adjusted absorber layer thicknesses and defect densities.
  • Simulated cells under standard one Sun (AM1.5G, 1000 W/m²) illumination.

Main Results:

  • Individual sub-cells achieved power conversion efficiencies (PCE) of 9.88% (top) and 14.26% (bottom).
  • The initial polymer/Si TSC demonstrated a PCE of 20.45% and a short circuit current density (Jsc) of 13.40 mA/cm².
  • Optimized tandem cell reached a Jsc of 16.43 mA/cm² and a PCE of 28.41% at current matching conditions.

Conclusions:

  • The developed polymer/Si TSC design shows significant potential for high PCE.
  • Optimization of VBO, defect density, and layer thickness is crucial for maximizing TSC performance.
  • The all thin-film TSC model is a viable candidate for future wearable electronics integration.