nanomos lab-ii NEGF formalism 5/20/2002 UIUC Summer School May
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1 nanomos lab-ii NEGF formalism 5/20/2002 UIUC Summer School May
2 Summary Quantum ballistic transport (qbte model). Density of States (DOS) plots. Transmission coefficient. Low temperature simulations Scattering simulations using Buttiker probes. 5/20/2002 UIUC Summer School May
3 Getting Started Open a browser and go to nanohub.purdue.edu Login by clicking in nanomos 2.0 in the nanotools list. Click on Modify/Create input file Go to examples folder, select the appropriate exercise: lab-1 etc and copy it to the working folder. Go back to the working folder 5/20/2002 UIUC Summer School May
4 Getting Started On top of the page go to Step 2: Execute Select your input deck from the pull-down button. Choose a name for the output folder and output file. Run the simulation by clicking on the Run nanomos button. Once simulation is done, go to Step 3: output, select an output file and open it. Congratulations you ran a nanomos simulation through the nanohub!!!! 5/20/2002 UIUC Summer School May
5 Exercise 1 Thin body (1.5 nm) DG MOSETS at Vds=Vdd. Interpretation of the DOS plot and transmission coefficient plot. The simulation will take 5 minutes Input deck in the example folder is uiuc-2.1 5/20/2002 UIUC Summer School May
6 Ex-1 input deck $ DEVICE DIRECTIVE device nsd=1e20, nbody=0, lgtop=10, lgbot=10, lsd=7.5, + overlap_s=0, overlap_d=0, + dopslope_s=0, dopslope_d=0, + tsi=1.5, tox_top=1.5, tox_bot=1.5, temp=300, $ TRANSPORT DIRECTIVE transport model=qbte, mu_low=500, beta=2, vsat=1e7, + ELE_TAUW=1e-13, ELE_CQ=1 Thin body NEGF ballistic $ BIAS DIRECTIVE bias vgtop=0.6, vgbot=0.6, vs=0.0, vd=0.6, vgstep=0.0, vdstep=0.0, + ngstep=0, ndstep=0, vd_initial=0.0 On state 5/20/2002 UIUC Summer School May
7 Outputs-DOS 5/20/2002 UIUC Summer School May
8 Output-Transmission 5/20/2002 UIUC Summer School May
9 Remarks In quantum ballistic simulation we compute the density of states. Forbidden regions can be identified and tunneling can be seen. Simulation time is more expensive than classical simulation 5/20/2002 UIUC Summer School May
10 Exercise 2 Underlapped device exhibits a quantum well in the off-state. DOS plot and transmission coefficient exhibit tunneling phenomena. The simulation will take 3 minutes Input deck in the example folder is uiuc-2.2 5/20/2002 UIUC Summer School May
11 Ex-2 input deck $ DEVICE DIRECTIVE device nsd=1e20, nbody=0, lgtop=10, lgbot=10, lsd=15, + overlap_s=-7, overlap_d=-7, + dopslope_s=0, dopslope_d=0, + tsi=1.5, tox_top=1.5, tox_bot=1.5, temp=300, $ TRANSPORT DIRECTIVE transport model=qbte, mu_low=500, beta=2, vsat=1e7, + ELE_TAUW=1e-13, ELE_CQ=1 Gate underlap NEGF ballistic $ BIAS DIRECTIVE bias vgtop=0.4, vgbot=0.4, vs=0.0, vd=0.001, vgstep=0.0, vdstep=0.0, + ngstep=0, ndstep=0, vd_initial=0.0 Off state 5/20/2002 UIUC Summer School May
12 Outputs 5/20/2002 UIUC Summer School May
13 Outputs 5/20/2002 UIUC Summer School May
14 Remarks Underlapped structure can be simulated. In the off state this creates a quantum well along the device. The DOS shows quantized energy levels in the well. The transmission coefficient shows a peak below the top of the barrier. 5/20/2002 UIUC Summer School May
15 Exercise 3 Low temperature (100 K) NEGF simulation of the device simulated in Lab-I exercise 3. For comparison, run a classical simulation of Lab-1 exercise 3 at low temperature (100 K). Demonstrates source-drain tunneling. The simulation will take 12 minutes Input deck in the example folder is uiuc-2.3 5/20/2002 UIUC Summer School May
16 Ex-3 input deck $ DEVICE DIRECTIVE device nsd=1e20, nbody=0, lgtop=10, lgbot=10, lsd=7.5, + overlap_s=0, overlap_d=0, + dopslope_s=0, dopslope_d=0, + tsi=1.5, tox_top=1.5, tox_bot=1.5, temp=100, $ TRANSPORT DIRECTIVE transport model=qbte, mu_low=500, beta=2, vsat=1e7, + ELE_TAUW=1e-13, ELE_CQ=1 Low temperature NEGF ballistic $ BIAS DIRECTIVE bias vgtop=0.0, vgbot=0.0, vs=0.0, vd=0.6, vgstep=0.05, vdstep=0.0, + ngstep=12, ndstep=0, vd_initial=0.0 Id-Vg simulation 5/20/2002 UIUC Summer School May
17 Outputs 5/20/2002 UIUC Summer School May
18 Remarks What s different with what you get? Comparison with lab-1 exercise 3: classical transport model. We see a higher off current due to source drain tunneling. The qbte model properly simulates source drain tunneling. 5/20/2002 UIUC Summer School May
19 Exercise 4 Do a scattering simulation..this will take time. (qdte) Examine the results available in the output example folder. Compare with quantum ballistic transport model. The simulation will take 40 minutes Input deck in the example folder is uiuc-2.4 5/20/2002 UIUC Summer School May
20 Ex-4 input deck $ DEVICE DIRECTIVE device nsd=1e20, nbody=0, lgtop=10, lgbot=10, lsd=7.5, + overlap_s=0, overlap_d=0, + dopslope_s=0, dopslope_d=0, + tsi=1.5, tox_top=1.5, tox_bot=1.5, temp=300, $ TRANSPORT DIRECTIVE transport model=qdte, mu_low=500, beta=2, vsat=1e7, + ELE_TAUW=1e-13, ELE_CQ=1 Thin body NEGF with scattering $ BIAS DIRECTIVE bias vgtop=0.6, vgbot=0.6, vs=0.0, vd=0.6, vgstep=0.0, vdstep=0.0, + ngstep=0, ndstep=0, vd_initial=0.0 On state 5/20/2002 UIUC Summer School May
21 Outputs Ballistic Scattering 5/20/2002 UIUC Summer School May
22 Remarks Scattering broadens the energy levels and results in a loss of coherency Scattering results in potential drops in the source and drain Loss of coherency washes out the oscillations in the local density of states The probe model relaxes longitudinal energy correctly 5/20/2002 UIUC Summer School May
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