Thin film solar panels
Solar panels made from thin layers of light absorbing material are a recent innovation that have lowered the cost of producing solar panels. Thin-film solar cells are also called second generation solar cells because they are a substantial improvement over the first generation, which use thick wafers of crystalline silicon. Some are made using chemical vapor deposition, while others are made using conventional printers. Thin-film solar cells have many advantages over silicon cells, such as low cost and light weight, but most of the current types have lower conversion efficiencies because they are so thin. Thin-film solar panels are made differently to silicon panels. The most common process used to make them is chemical vapor deposition. Gases react inside a chamber to form a condensate that settles uniformly onto a substrate. One example is amorphous silicon, which doesn't have a crystalline structure, and is made by reacting silate gas with hydrogen gas to form a silicon condensate that forms a layer on a plastic substrate. Other compounds that can be used to make thin-film solar cells by this process include cadmium telluride, gallium arsenide, and copper-indium selenide. While they are made differently to silicon solar cells, they all use the same photoelectric effect to covert sunlight into electricity.
A different type of thin-film solar panels is made using a light-absorbing dye. The anode is made from a glass plate coated with a conductive layer and a layer of titanium dioxide. The plate is then dipped into a dye which bonds to the surface of the titanium dioxide molecules. The cathode is made from a plate coated with a conductive layer and an iodine electrolyte. Both plates are joined and the edges sealed to help prevent the electrolyte leaking out. Light photons that are absorbed by the dye molecules create free electrons that cross over to the titanium dioxide, where they move up to the conductive layer on the anode. Meanwhile, the dye gains an electron from the iodine electrolyte, which later recovers it from one of the returning electrons at the cathode.
Thin-film solar cells have several advantages over conventional silicon cells. They are cheaper because they require less energy, labor, and raw materials to produce. They are well suited to mass production and some can even be made using conventional printers. They can be made with flexible substrates which allow them to be used in more locations than silicon cells, such as clothing and sails. They have a higher power-to-weight ratio, making them a better choice for solar vehicles that need to remain lightweight.
The main disadvantage of thin-film solar cells presently is their low conversion efficiency compared with silicon cells, although this is being improved with research. Recent discoveries have even surpassed silicon cells but production of these cells is many years away. There are also environmental concerns about the use of heavy metals in some cells but this is not a major problem as the amount used in thin-film cells is very small. Dye-sensitized cells have a tendency to leak at high temperature due to thermal expansion of their electrolyte.
Thin-film solar cells are a recent innovation and are used in only one in every ten solar panels today. There is still much work to be done to improve their poor conversion efficiency before they can replace the massive number of silicon solar cells in use. There are many different types that are currently being researched, so it is difficult to predict which type will dominate. One thing is certain, thin-film solar panels will be a major source of solar energy well into the future.
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