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Solar cells, also known as photovoltaic cells, are devices that convert solar energy into electricity. They work by absorbing light particles from the sun -- called photons -- and expelling electrons, which generate a flow of electricity. Solar cells are commonly used for remote applications, such as powering satellites in space, or providing supplemental electricity for refrigerators and air conditioners in remote locations. They are also used to power consumer products, such as calculators and MP3 players.

Sunlight is composed of a spectrum of electromagnetic radiation which includes visible light, infrared and ultraviolet rays. Solar cells contain materials that are sensitive to the specific frequencies of light in the infrared and visible spectrums. When a photon of the appropriate frequency strikes a solar cell, it can be absorbed by an electron in the cell, which can then be ejected from the cell. This ejection creates an electrical charge, which flows through the cell in the form of an electrical current.

Solar cells consists of four main components: a semi-conductor crystalline structure, an anti-reflective coating, a junction box and a glass or plastic housing. The semi-conductor crystalline structure is the most important part of the cell, as it determines the efficiency and quality of the cell. It is composed of two layers of crystalline silicon, which have been treated with doping agents to create a semiconductor. The doping agents create a difference in electrical charges between the two layers, forming a positive, or p-type layer, and a negative, or n-type layer. This charge separation creates an electric field, also known as the depletion zone, across the junction between the layers.

When light strikes the surface of the box, part of it is reflected, and part of it penetrates the material and interacts with electrons in the semi-conducting materials. The anti-reflective coating helps reduce the amount of light that is reflected, allowing more light to reach the cell. When a photon is absorbed in the depletion zone, it creates a voltage between the positive and negative layers. This voltage forces electrons to leave the negative layer and move towards the positive one, creating an electrical current.

The junction box is a thin metal cylinder that runs down the side of the cell and serves as an electrical connection near the junction between the positive and negative layers. It collects the current created by the light striking the cell and redirects it out of the cell, allowing the user to utilize the power. The glass or plastic housing surrounding the crystalline structure provides protection from environmental elements that could potentially damage the cell. In addition, the housing also adds to the aesthetic appeal of the cell.

Solar cells have a variety of applications in both residential and commercial settings. Most commonly, they are used to generate electricity from sunlight for remote locations where power is not readily available. They are also used to power consumer products and can be linked together in photovoltaic (PV) systems to provide supplemental electricity for homes and businesses. By utilizing solar cells, we can reduce the dependence on fossil fuels, lower emissions, and help conserve our natural resources.