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density on the chip has resulted in an increased overall power consumption. Supply voltage scaling results in a quadratic reduction in the dynamic power consumption thereby achieving energy efficient operation in digital circuits. However, reducing the supply voltage of a transistor requires that the threshold voltage be scaled proportionately in order to achieve the same performance. But this also results in an exponential increase in the static power consumption arising from the fundamental limitation of sub-threshold swing limited to 60mV/decade at room temperature in a MOSFET. Tunneling Field Effect Transistors (TFETs), in principle, can achieve sub-60mV/decade switching slope (SS) at room temperature due to the energy filtering achieved by band to band tunneling [1-2], thus enabling voltage scaling [3]. However, the drive current that can be achieved is limited due to the tunneling barrier present at the source-channel interface. III-V semiconductor based TFETs are attractive due to their direct band-gap and wide range of compositionally tunable band-alignment [4]. !7"$& +,& +<$& ()033$+'*1(%& 4G*G#& )+'"1+"'$& 1,#)+*+"+*#/& +<$&

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6A-3 Tunnel Transistors for Energy Efficient Computing ...

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