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SOI wafer is used when a semiconductor structure needs a controlled silicon device layer separated from the handle substrate by a buried oxide layer. This structure helps reduce leakage, parasitic capacitance, and substrate interference, making it useful for advanced ICs, MEMS, RF devices, photonics, sensors, and power-related structures.

Silicon-on-Insulator (SOI) wafer technology represents a significant evolution in semiconductor manufacturing, offering distinct performance advantages over traditional bulk silicon substrates. At its core, an SOI wafer is a layered structure comprising a thin top layer of silicon, a buried silicon dioxide (SiO₂) insulating layer, and a silicon handle wafer substrate.

Silicon-on-Insulator, often shortened to SOI, is a wafer structure built from three functional layers: a top silicon device layer where circuits or microstructures are formed, an insulating buried oxide layer that electrically isolates the device layer, and a silicon handle wafer that provides mechanical strength during processing.

Silicon on Insulator (SOI) is a semiconductor substrate technology in which a thin active silicon layer is separated from the bulk silicon substrate by an insulating layer. This structure improves many device-level properties, offering advantages in speed, power consumption, and reliability compared to conventional bulk silicon wafers.