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a-Si:H/SiNW shell/core for SiNW solar cell applications.

Eman Sad Ashour1, Mohamad Yusof Bin Sulaiman, Mohd Hafidz Ruslan

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A hydrogenated amorphous silicon shell significantly enhances silicon nanowire solar cells. This shell improves light absorption and passivates defects, boosting solar cell performance by over 37%.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Vertically aligned silicon nanowires (SiNWs) are promising for solar cell applications.
  • Wet etching processes for SiNW fabrication can introduce performance-limiting defects.

Purpose of the Study:

  • To investigate the effect of a hydrogenated amorphous silicon (a-Si:H) shell on SiNW solar cell performance.
  • To analyze the optical properties and defect passivation capabilities of the a-Si:H shell.

Main Methods:

  • Synthesis of SiNWs via chemical etching of silicon wafers.
  • Deposition of a-Si:H layer to form a shell on SiNWs.
  • Optical reflection and absorption measurements.
  • Current-voltage (I-V) measurements for solar cell characterization.

Main Results:

  • The a-Si:H shell reduced optical reflection to 5.2% in the 250-1,000 nm range.
  • Average light absorption exceeded 87% with the a-Si:H shell.
  • Solar cell efficiency increased by over 37%, with notable improvements in open-circuit voltage (>15%) and short-circuit current (>12%).

Conclusions:

  • The a-Si:H shell effectively passivates defects introduced during wet etching.
  • The enhanced optical properties and defect passivation lead to significantly improved SiNW solar cell performance.