AXT is a developer and producer of compound and single element semiconductor substrates, also known as wafers. The company's compound substrates combine indium with phosphorous (indium phosphide: InP) or gallium with arsenic (gallium arsenide: GaAs). InP is a semiconductor substrate used in, among others, fiber optic lasers and detectors, passive optical networks, metro and data center connectivity, silicon photonics, infrared motion control and infrared thermal imaging. The company also makes semi-insulating GaAs substrates used in making semiconductor chips in applications such as power amplifiers for wireless devices, transistors and solar cells for drones. In addition, the company sells certain raw materials.