138 citations · 318 across the 10 of their papers we have counts for
10 papers
Carrier transport and performance limit of semi-transparent photovoltaics: CuInGaSe as a case study
Eymana Maria, Ajanta Saha, M. Ryyan Khan +3
Semi-transparent photovoltaic devices for building integrated applications have the potential to provide simultaneous power generation and natural light penetration. CuInGa…
A tunnel FET compact model including non-idealities with verilogy implementation
Redwan N. Sajjad, Ujwal Radhakrishna, Dimitri A. Antoniadis
We present a compact model for Tunnel Field Effect Transistors (TFET), that captures sev- eral non-idealities such as the Trap Assisted Tunneling (TAT) originating from interface t…
Trap assisted tunneling and its effect on subthreshold swing of tunnel field effect transistors
Redwan N. Sajjad, Winston Chern, Judy L. Hoyt +1
We provide a detailed study of the interface Trap Assisted Tunneling (TAT) mechanism in tunnel field effect transistors to show how it contributes a major leakage current path befo…
Modified Dirac Hamiltonian for Efficient Quantum Mechanical Simulations of Micron Sized Devices
K. M. Masum Habib, Redwan N. Sajjad, Avik W. Ghosh
Representing massless Dirac fermions on a spatial lattice poses a potential challenge known as the Fermion Doubling problem. Addition of a quadratic term to the Dirac Hamiltonian c…
Quantum transport at the Dirac point: Mapping out the minimum conductivity from pristine to disordered graphene
Redwan N. Sajjad, Frank Tseng, K. M. Masum Habib +1
The phase space for graphene's minimum conductivity is mapped out using Landauer theory modified for scattering using Fermi's Golden Rule, as well as the Non-Equil…
Chiral tunneling of topological states: towards the efficient generation of spin current using spin-momentum locking
K. M. Masum Habib, Redwan N. Sajjad, Avik W. Ghosh
We show that the interplay between chiral tunneling and spin-momentum locking of helical surface states leads to spin amplification and filtering in a 3D Topological Insulator (TI)…
Manipulating chiral transmission by gate geometry: switching in graphene with transmission gaps
Redwan N. Sajjad, Avik W. Ghosh
We explore the chiral transmission of electrons across graphene heterojunctions for electronic switching using gate geometry alone. A sequence of gates is used to collimate and ort…
Atomistic deconstruction of current flow in graphene based hetero-junctions
Redwan N. Sajjad, Carlos Polanco, Avik W. Ghosh
We describe the numerical modeling of current flow in graphene heterojunctions, within the Keldysh Landauer Non-equilibrium Green's function (NEGF) formalism. By implementing a …
Manifestation of chiral tunneling at a tilted graphene pn junction
Redwan N. Sajjad, S. Sutar, J. U. Lee +1
Electrons in graphene follow unconventional trajectories at PN junctions, driven by their pseudospintronic degree of freedom. Significant is the prominent angular dependence of tra…
High efficiency switching using graphene based electron 'optics'
Redwan Sajjad, Avik Ghosh
The absence of a band-gap in graphene limits the gate modulation of its electron conductivity, both in regular graphene as well as in PN junctions, where electrostatic barriers pro…