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Modeling of Diode Reverse Characteristics01:14

Modeling of Diode Reverse Characteristics

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In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
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Modelling photovoltaic soiling losses through optical characterization.

Greg P Smestad1, Thomas A Germer2, Hameed Alrashidi3

  • 1Sol Ideas Technology Development, P.O. Box 5729, San José, California, 95150, USA. inquiries@solideas.com.

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Soiling on photovoltaic (PV) modules, caused by various contaminants, reduces solar energy output. This study found soiling disproportionately affects blue light and follows predictable particle size distributions globally.

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Area of Science:

  • Solar Energy Research
  • Materials Science
  • Environmental Science

Background:

  • Soiling on photovoltaic (PV) modules is a global issue impacting solar energy generation.
  • Contaminants like dust, soot, and pollen reduce the light reaching solar cells.
  • Understanding soiling effects is crucial for optimizing PV system performance.

Purpose of the Study:

  • To compare naturally accumulated soiling on PV glass at diverse global locations.
  • To analyze the spectral impact of soiling on light transmittance.
  • To establish a correlation between soiling characteristics and optical consequences.

Main Methods:

  • Spectral hemispherical transmittance measurements of soiled PV glass coupons.
  • Analysis of soiling composition including particle size distribution.
  • Comparison with the IEST-STD-CC 1246E cleanliness standard.

Main Results:

  • Natural soiling significantly impacts the blue and ultraviolet (UV) spectrum more than visible and infrared (IR) light.
  • Soiling transmittance spectra showed similar patterns across all seven worldwide sites.
  • Particle size distribution aligned with the IEST-STD-CC 1246E standard.
  • Fractional surface coverage by particles showed a linear correlation with transmittance reduction.

Conclusions:

  • Soiling's optical impact is predictable and disproportionately affects shorter wavelengths.
  • A modified Ångström turbidity equation effectively describes soiling transmittance spectra.
  • Estimating soiling's optical effects is feasible using particle size distribution and cleanliness values.