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TFET (Tunnel field effect transistor) is widely used in low voltage operating electronic devices because of the ability to achieve a subthreshold swing lower than 60mV/decade. Lower subthreshold swing is also a root cause for the low power and the high speed behavior of the device. Conduction of current in TFET is due to band to band tunneling. TFET has lower-off currents as compared to MOSFET. Because of which power dissipation is also lower. In this paper, Kane-Sze formula based analytical model is used to evaluate and improve drain current. Using this analytic model, the obtained value of drain current is 2.3mA at VDS=0.4V, transconductance (gm) is 160V -1 , transconductance to drain current ratio is 2200 V -1 , output resistance (R0) is 1.E4 ohm, intrinsic gain of the TFET is obtained 1.0E5 V/V. The fabrication of TFET is done using Sentaurus TCAD tool. Also, the output characteristics of the TFET and tunneling phenomenon have been analyzed.Keywords-Tunnel field effect transistor, band to band tunneling, transconductance, low voltage operating transistor

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