Spire Semiconductor is providing dedicated large-scale contract design and manufacturing capabilities to manufacturers of solar concentrator cells. Through its Captive Custom Capacity initiative, it operates a complete compound semiconductor device fabrication line for manufacturing custom devices and for development, prototyping, pilot production and volume manufacturing. Wafer-processing capabilities include photolithographic processing of III-V cell structures and deposition of broadband, dual-layer antireflection coatings. The company grows a variety of GaAs and InP epitaxial structures at its facility, and its engineers work closely with customers to assure that the wafers satisfy their expectations. It offers single-junction GaAs and dual-junction InGaP/GaAs concentrator solar cells for power conversion. Both have a photoarea diameter of 3 mm, and both operate at 28 °C.