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Related Concept Videos

P-N junction01:11

P-N junction

448
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
448

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On-chip solar power source for self-powered smart microsensors in bulk CMOS process.

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  • 1School of Electronics and Communication Engineering, Sun Yat-Sen University, Shenzhen, China.

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A new center electrode design for on-chip solar cells significantly boosts photoelectric conversion efficiency. This advancement enhances solar energy harvesting for self-powered Internet of Things microsensors.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Renewable Energy

Background:

  • On-chip solar cells are vital for self-powered microsensors in the Internet of Things (IoT).
  • Improving photoelectric conversion efficiency (PCE) is key to advancing solar energy harvesting.
  • Surface electrode shadowing limits the efficiency of conventional on-chip solar cell designs.

Purpose of the Study:

  • To enhance the photoelectric conversion efficiency of on-chip solar cells.
  • To reduce the shadowing effect caused by surface electrodes.
  • To improve solar energy harvesting for self-powered IoT applications.

Main Methods:

  • Fabrication of a segmented triple-well on-chip solar cell using a standard 0.18 μm CMOS process.
  • Implementation of a center electrode (CE) layout to minimize shadowing.
  • Integration of highly doped interconnections for improved performance.
  • Testing under solar simulator illumination and evaluation of end-to-end conversion efficiency.

Main Results:

  • Achieved a photoelectric conversion efficiency of 25.79% under illumination.
  • Demonstrated a 17.49% improvement compared to conventional ring electrode (RE) designs.
  • Obtained a maximum end-to-end energy harvesting conversion efficiency of 10.20%.
  • Ensured a stable 1V output under varying illumination and load conditions.

Conclusions:

  • The center electrode (CE) layout effectively reduces shadowing, enhancing on-chip solar cell efficiency.
  • The developed on-chip solar cell offers a significant improvement for solar energy harvesting in IoT devices.
  • The system provides reliable power output, suitable for self-powered smart microsensors.