Advanced Level

Flipped Learning

Objective. Prepare for classroom discussion by understanding the sequence photon → absorption → charge separation → current flow and the physics/engineering connections in photovoltaic systems.

Tasks (to be submitted as a 1–2-page report or 6–8 slides):

1.     Short reading on the structure of a silicon solar cell and the path of photons. Highlight: anti-reflective coating, N-type layer, P-N junction, P-type layer, metal contacts.

  1. Worksheet "N-type vs. P-type Silicon": complete a table with:
    • Doping element (phosphorus/boron)
    • Majority charge carrier (electrons/holes)
    • Role in charge separation
    • Position in cell structure (top/bottom)
  2. PhET Semiconductors simulation: create two screenshots -
    a. Intrinsic (undoped) silicon: observe energy bands and lack of free carriers
    b. Doped silicon (N+P junction): observe band bending, built-in electric field, and charge separation under illumination
  3. Short synthesis (max 120 words): explain in your own words how the solar cell does not "collect" sunlight like a thermal panel but converts photon energy into separated electrical charges through quantum absorption and junction physics.
  4. Three debriefing questions:
    • One on quantum physics: Why must photon energy exceed the bandgap?
    • One on materials science: How does doping create an electric field?
    • One on systems engineering: Why do solar panels produce DC but homes use AC?

Submission. Upload the PDF or slides to the class channel before the lesson.