As a second-generation semiconductor, Four junction gallium arsenide (GaAs) single crystal is known as the "semiconductor aristocracy" because of its high cost.
Four junction solar cell is contemporary internationally recognized as the most mature compound semiconductor material after "silicon". It has superior characteristics such as high frequency, high electron mobility, high output power, low noise, and good linearity. Four junction solar cell is the best in the optoelectronics and microelectronics industries. One of the important supporting materials. The second-generation semiconductors represented by gallium arsenide are widely used in the manufacture of high-frequency, high-speed, high-power, low-noise, high-temperature, and radiation-resistant integrated circuits. They have developed into modern "electronic information products" and "information products". The key technology of "Highway", the 5G chip market is very good, and the supply of products exceeds supply. Gallium arsenide (GaAs) is an indispensable component for optoelectronics and mobile phone Netcom high-frequency communications. In recent years, with the rapid growth of Internet of Things (IoT), Internet of Vehicles and AI (artificial intelligence) applications, countries have accelerated the deployment of 5G infrastructure, The introduction of facial recognition in Apple iPhone X has driven the demand for gallium arsenide VCSELs and high-end communication components. Facing the big business opportunities in the gallium arsenide industry, gallium arsenide and photovoltaic power plants at home and abroad are all trying their best to advance.
Four junction solar cells are being developed as the next generation of concentration photovoltaic products to take over three-junction technology.The highest solar cell conversion efficiency is achieved through four junction devices under concentrated sunlight,Because GaAs has a high electron mobility, it can be used to prepare high-speed or microwave semiconductor devices. Gallium arsenide is also used to make high temperature resistant, radiation resistant or low noise devices, as well as near-infrared light emitting and laser devices, as well as photocathode materials. More importantly, it will become the basic material for the development of ultra-high-speed semiconductor integrated circuits in the future.so the four junction solar cell cost around USD50-70 per 1cm.