These Planar diffused photodiodes are designed for either photoconductive (low capacitance, high speed applications) or photovoltaic operation (low noise, DC applications). Photodiodes are semiconductors that generate a current or voltage when illuminated by light. They have no internal gain, but can operate with much greater dynamic range than other types of photon detectors. In addition to a wide variety of standard detector configurations, API also welcomes the opportunity to design a custom solution to meet your exact needs.