Thermophotovoltaic devices convert heat energy into electricity. They are made of two main components: a photovoltaic cell and a heat source. The heat source is usually a combustion engine or a solar concentrator. The photovoltaic cell converts the heat energy into electricity, which can then be used to power electrical devices. TPV devices are typically used in high-temperature applications, such as power plants and industrial furnaces. However, they can also be used in lower-temperature applications, such as home heating systems. TPV technology is still in its early stages of development, but it has the potential to become a major source of renewable energy.