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@ARTICLE{Acharya:864660,
author = {Acharya, Abhishek and Solanki, A. B. and Glass, S. and
Zhao, Qing-Tai and Anand, Bulusu},
title = {{I}mpact of {G}ate–{S}ource {O}verlap on the
{D}evice/{C}ircuit {A}nalog {P}erformance of {L}ine {TFET}s},
journal = {IEEE transactions on electron devices},
volume = {66},
number = {9},
issn = {1557-9646},
address = {New York, NY},
publisher = {IEEE},
reportid = {FZJ-2019-04358},
pages = {4081 - 4086},
year = {2019},
abstract = {The gate–source overlap length ( ${L}_{{\text {OV}}}$ )
in the line tunneling FET (L-TFET) can be used as a design
parameter to improve the analog circuit performance. In this
paper, we investigate the drain current ( ${I}_{D}$ )
dependence on ${L}_{{\text {OV}}}$ , considering the
electrostatics of the gate–source overlap region. It is
observed that ${I}_{D}$ increases with ${L}_{{\text {OV}}}$
exhibiting a nonlinear behavior. This happens as the impact
of the lateral electric field at the far end of the tunnel
junction reduces, thereby reducing the tunneling rate. Based
on our semiempirical physical ${I}_{D}$ – ${L}_{{\text
{OV}}}$ model, a novel ${L}_{{\text {OV}}}$ variation-aware
small signal model for L-TFET is also proposed. The output
resistance and the gate–drain capacitance remain almost
independent of ${L}_{{\text {OV}}}$ in the saturation
regime. The gate–source capacitance and the
transconductance linearly increase with ${L}_{{\text {OV}}}$
. A common source amplifier is demonstrated with ~2.4 times
increase in the voltage gain when ${L}_{{\text {OV}}}$ is
increased from 20 to 50 nm, with a penalty of ~10\% in the
bandwidth. We observe that it is not possible to achieve the
gain similar to one obtained using 2.5 times increase in
${L}_{{\text {OV}}}$ even after increasing the device width
five times. However, the bandwidth reduces 30\% at such
width owing to an increase in the gate capacitances.},
cin = {PGI-9},
ddc = {620},
cid = {I:(DE-Juel1)PGI-9-20110106},
pnm = {521 - Controlling Electron Charge-Based Phenomena
(POF3-521)},
pid = {G:(DE-HGF)POF3-521},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000482583200059},
doi = {10.1109/TED.2019.2927001},
url = {https://juser.fz-juelich.de/record/864660},
}