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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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The voltage of a single solar cell is
0.5 V
1 V
1 V
5 V
0.5 V
Quick Summary: A single standard silicon photovoltaic cell typically produces an open-circuit voltage ($V_{OC}$) of approximately 0.5 V to 0.6 V under standard test conditions (STC). Regardless of the physical size of the cell, this voltage is determined by the semiconductor bandgap energy of silicon.
A single standard silicon photovoltaic cell typically produces an open-circuit voltage (VOC) of approximately 0.5 V to 0.6 V under standard test conditions (STC). Regardless of the physical size of the cell, this voltage is determined by the semiconductor bandgap energy of silicon.
Eg≈1.1 eV — Bandgap energy of silicon which dictates the output voltage
VOC=qnkTln(I0Iph+1) — Open circuit voltage relationship
When photons with energy greater than the bandgap of the silicon material strike the P-N junction, electron-hole pairs are generated. The built-in electric field at the junction separates these charges, creating a potential difference across the cell. Because the bandgap of silicon is fixed at ~1.1 eV, the resulting terminal voltage is inherently restricted to the 0.5–0.6 V range.
The voltage is primarily a function of the material bandgap, not the surface area.
Higher voltages in solar panels are achieved by connecting multiple cells in series.
0.5 V is a standard nominal value used for design calculations in elementary power engineering.
Current (I) is directly proportional to the surface area of the solar cell.
Reliable solid-state operation
Modular configuration capabilities
Very low voltage per individual unit
Voltage sensitivity to temperature variations
Series-parallel arrays for solar power plants
Small-scale electronic power supplies
STC refers to an irradiance of 1000 W/m², a temperature of 25°C, and an air mass of 1.5.
Options B, C, and D are incorrect as they exceed the physical voltage limit of a single silicon P-N junction cell.
A is correct — The open-circuit voltage of a standard silicon solar cell is approximately 0.5 V due to the semiconductor bandgap properties.
Always remember: in solar arrays, cells are connected in series to increase voltage and in parallel to increase current capacity.