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In this paper we show the effect of electron-phonon scattering on the performance of monolayer (1L) MoS and WSe channel based n-MOSFETs. Electronic properties of the channel materials are evaluated using the local density approximation (LDA) in density functional theory (DFT). For phonon dispersion we employ the small displacement / frozen phonon calculations in DFT. Thereafter using the non-equilibrium Green’s function (NEGF) formalism, we study the effect of electron-phonon scattering and the contribution of various phonon modes on the performance of such devices. It is found that the performance of the WSe device is less impacted by phonon scattering, showing a ballisticity of 83% for 1L-WSe FET for channel length of 10 nm. Though 1L-MoS FET of similar dimension shows a lesser ballisticity of 75%. Also in the presence of scattering there exist a a 21–36% increase in the intrinsic delay time () and a 10–18% reduction in peak transconductance () for WSe and MoS devices respectively.


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