In this work, the performance of multiple-gate SOI MOSFETs is analysed using variational approach including quantum effects. An analytical model is derived to accounting the quantum effects at the silicon (Si)/silicon dioxide (SiO2) interface. A general procedure is used for calculating the quantum inversion charge density. Using this inversion charge density, the drain current is obtained. Our model results are compared with the simulation results and its shows very good agreement. Our results

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... highlighted that cylindrical surrounding gate MOSFET is a good candidate to obtain the high drain current compared with other two devices.