What is solar photovoltaic technology? Discuss its underlying principle and applications.

Solar photovoltaic (PV) technology is a method of converting sunlight directly into electricity using semiconductor materials. It is one of the most promising renewable energy technologies due to its sustainability, scalability, and decreasing costs. Solar PV technology is widely used for various applications, ranging from small-scale residential power generation to large-scale solar farms supplying electricity to the grid.

### Underlying Principle of Solar Photovoltaic Technology  

Solar photovoltaic technology is based on the photoelectric effect, which was first explained by Albert Einstein in 1905. The key components of this technology are photovoltaic (PV) cells, typically made from semiconductor materials like silicon. The working principle of PV technology can be described in the following steps:

1. Absorption of Sunlight: When sunlight, consisting of photons, strikes the surface of a PV cell, the energy from the photons is absorbed by the semiconductor material.
2. Generation of Electron-Hole Pairs: The absorbed energy excites electrons, causing them to break free from their atomic bonds. This creates free electrons and corresponding positively charged holes.
3. Electric Field Effect: The internal electric field present in the PV cell, due to the p-n junction, forces the free electrons to _____ ________ ___ ___ _______ ____ _________ ________ _____ _______.
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