How Does Solar Panel Technology Work?

Author: Marina

Jul. 23, 2024

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The world is gradually observing a shift towards renewable energy sources as alternatives to conventional fossil fuels. Solar power is one of the cleanest and most viable sources of renewable energy available in the world today. However, many people remain in the dark about how solar panel technology works. This article will explain how solar panels work and shed some light on the process.

Solar panels are made up of photovoltaic (PV) cells. These panels, when exposed to sunlight, absorb the energy from the sun, and convert it into electricity. The energy produced by the panels can be used to power homes, businesses, and even transportation. The amount of energy produced depends on the size of the solar panel and the intensity of the sunlight.

PV panels are made up of layers of semiconductors, such as silicon, which are capable of converting light into electricity. These semiconductors are made up of atoms that have four valence electrons in their outermost shells. When sunlight strikes the silicon, the electrons are displaced from their atoms forming electron-hole pairs. The holes move towards the junction whilst the electrons flow towards the metal conductor beneath.

The PV cells consist of two layers made of semiconductors with opposing charges. The top layer has electron-deficient p-type or positively charged silicon, while the bottom layer has electron-rich n-type or negatively charged silicon. These two layers are joined to make a p-n junction. The p-type layer is thin whilst the n-type is thicker, and the junction is formed in between.

As soon as sunlight strikes the surface of the solar cell, some of it is absorbed by the p-type layer. This absorption leads to the release of free electrons in the p-type layer that move towards the n-type layer. Simultaneously, the holes that have been formed in the p-type layer also move towards the n-type layer. This creates an electrical field that separates the free electrons and holes in the n-type layer.

When the free electrons from the p-type layer enter the n-type layer, they join the negative semi-conductors, creating a negative electric charge. On the other hand, the holes from the p-type layer that are released, combine with the positive semi-conductors in the positive side of the solar cell, thus creating a positive charge. This process of separation between the two layers of semiconductors results in a flow of electrical current in the external circuit, where the PV panels are connected.

Finally, the wires from the external circuit pass the electrical current from the solar panels through an inverter. The inverter changes the DC electrical current produced by the PV panels into AC electrical current which is suitable for powering household appliances and electronics.

It is important to mention that a PV panel’s efficiency is determined by its ability to transform sunlight into electricity. This efficiency determiner takes into account various factors, including the type of semiconductor material, the type of metal used to join the two different semiconductors, and the amount of photons that hit the cell. Recent advances in technology have made solar panel efficiency better than it was before ensuring that the panels produce more power from the same exposure to sunlight.

Solar technology has come a long way since it was first developed. Today, it is possible to install solar panels on homes and businesses that are capable of producing enough electrical power to run lighting systems, heaters, cooling systems, and a vast range of other appliances. Moreover, the technology is evolving rapidly, and it’s not entirely impossible that we will see solar-powered transportation in the future.

In conclusion, solar panel technology works by capturing the energy from the sun and converting it into electrical energy by means of semiconductors. This technology has come a long way, and its efficiency is increasing every year. The use of solar panels is undoubtedly one of the best ways to contribute to our planet’s sustainability and preserve it for generations to come. With many countries’ initiatives supporting renewable energy projects, solar panel technology is expected to play a significant role in the world's energy supply in the years to come.

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