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📘 A photon carries a packet of light energy

Sunlight is electromagnetic radiation, and a useful way to describe its energy is as photons: discrete packets whose energies depend on their wavelengths.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Light to junctionExplain photon absorption, silicon, and the p-n junction.Absorbed light creates carriers; doping and the junction give them direction.
  2. Collecting currentDescribe contacts, module wiring, and scaling cell output.Metal grids collect charge; series wiring raises module voltage.
  3. Limits and conversionConnect illumination, I-V curves, temperature, and losses.Output varies with conditions; heat and resistance limit conversion.
  4. To the gridTrace inverter conversion, MPPT, and the complete energy path.Electronics match DC output to AC loads and seek maximum available power.

Questions this course answers

What does a photon provide to start the photovoltaic process?

An absorbed photon can transfer energy to an electron and create an electron-hole pair.

Why is silicon called a semiconductor?

Silicon's crystal and doping let engineers control its charge carriers and conductivity.

What is the main role of the built-in electric field?

The field provides direction for separating newly created charge carriers.

Why are front contacts made as thin fingers?

The contacts must conduct well without blocking too much incoming light.

What does series wiring primarily add?

Series-connected cells add their voltages to create a higher-voltage string.

What usually happens as illumination increases?

More suitable light generally creates more electron-hole pairs and more current.

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