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Objectives Evaluate effects of underlap (L d ) Evaluate effects of boundary condition Methods

Effects of Underlap and Boundary Condition Zhengping Jiang, Yeqing Lu, Yaohua Tan, Yu He, Michael Povoloskyi , Tillmann Kubis, Alan Seabaugh , Patrick Fay, Gerhard Klimeck. Objectives Evaluate effects of underlap (L d ) Evaluate effects of boundary condition Methods

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Objectives Evaluate effects of underlap (L d ) Evaluate effects of boundary condition Methods

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  1. Effects of Underlap and Boundary ConditionZhengping Jiang, Yeqing Lu, Yaohua Tan, Yu He, Michael Povoloskyi, Tillmann Kubis, Alan Seabaugh, Patrick Fay, Gerhard Klimeck Objectives • Evaluate effects of underlap (Ld) • Evaluate effects of boundary condition Methods • Semi-classical potential with corrected parameters • Non-equilibrium Green’s Function Results • Ambipolar current is due to hole thermal emission • Confinement increases bandgap and reduces ambipolar current • Low IOFF at Ld=0nm → boundary condition blocks tunneling Impacts • Underlap decouples channel from drain contact and suppresses ambipolar current • Define proper open boundary condition is important to predict device performance Simulation Structure Spectrum currents show effects of open BC Upper: tunneling current is blocked due to raised potential at boundary and thermal current is increased Lower: thermal current is blocked by bandgap *IEEE ELECTRON DEVICE LETTERS, VOL. 33, NO. 5, MAY 2012

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