How do Solar cells work? | #PNjunction solar cell | #solarenergy Explain

How is Solar Energy Used to Generate Electricity?

Overview of Solar Energy

• The most commonly used renewable energy source is solar energy.

Photovoltaic Systems

• Solar energy is converted into electricity using a photovoltaic (PV) system.

• The basic component of a PV system is the solar cell, which produces about 0.5 volts of electricity.

• A solar panel consists of multiple solar cells connected in series to generate usable voltage; for example, 30 cells can produce 15 volts.

Functionality of Solar Cells

• The process by which sunlight generates electricity in solar cells is called the photovoltaic effect.

• Solar cells are made from semiconductors, primarily silicon, and consist of three layers: an n-type layer with high electron concentration and a p-type layer with high hole concentration.

Formation of APN Junction

• When the n-type and p-type materials are joined, they form an APN junction that creates negatively charged and positively charged layers due to electron and hole movement.

Depletion Region Dynamics

• Sunlight penetrates the top layer to reach the depletion region where neutral atoms are broken apart by photons, creating free charge carriers (electrons and holes).