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General Questions and Answers / Re: Realistic Modell?
« on: March 17, 2011, 12:54 »
it´s pulsed laser
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General Questions and Answers / Re: Realistic Modell?
« on: March 17, 2011, 12:03 »
to A. Blom...Thank you.....I have another short question....because I have ohmic and shotky device i shouldn´t be perfect symmetric dioden characteristc.......can ATK see the different and make a bit different I-V caracteristik ( a one side of I-V curve is a bit flater as the other..I think its not improtant because a topic of ohmic contact is not so clear in a literature..but its nice for my understanding of a programm)
to Nordland: Its a laser source with 488 nm....How change te electrical chareceristics under ilumination
Best regrards
Ikgut
to Nordland: Its a laser source with 488 nm....How change te electrical chareceristics under ilumination
Best regrards
Ikgut
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General Questions and Answers / Realistic Modell?
« on: March 14, 2011, 13:31 »
Hallo everybody,
I have build a nanodevice: Au CdSe Ti. And I simulate I-V curves at first I have only a linear function as i put symmetrize I-C curves and I have a beutifull diode characteristic. But I have some questions:
1. What Im doing with symmetrize function? Is that some kind of absoltue values or signum function
2. Is there a possobility to simulate surface traps? Maybe current-time curves?
3. Is there a possibilty to look how change a current if I iluminate that with light?
4. Can ATK read mathlab scripts?
5. At last is there a possiblity to sweep a gate for such devices? I have simulate a gate like in tutorial graphene but ists dissapear if i make a device modus? Why?
P.S. last question: How much costs to update a ATK for linux cluster-PC?
Thanks for help
Best regards
IKgut
I have build a nanodevice: Au CdSe Ti. And I simulate I-V curves at first I have only a linear function as i put symmetrize I-C curves and I have a beutifull diode characteristic. But I have some questions:
1. What Im doing with symmetrize function? Is that some kind of absoltue values or signum function
2. Is there a possobility to simulate surface traps? Maybe current-time curves?
3. Is there a possibilty to look how change a current if I iluminate that with light?
4. Can ATK read mathlab scripts?
5. At last is there a possiblity to sweep a gate for such devices? I have simulate a gate like in tutorial graphene but ists dissapear if i make a device modus? Why?
P.S. last question: How much costs to update a ATK for linux cluster-PC?
Thanks for help
Best regards
IKgut
4
General Questions and Answers / Re: Quantumtransport through CdS-Nanowire
« on: February 28, 2011, 14:09 »
...Okay...I think I understand a bit what do you mean because in Landauer formalism transmission is function of energy and bias voltage, they must be the same, is that right? or how I can prove the transmission dependance? My bias range are plus/minus 1V and second calculation plus/minus 2 V. I have very short nanowire, because at the momant I not calculate on cluster, maybe thats is the reason?
I try to realize your advices ....Thynk you
IKgut
I try to realize your advices ....Thynk you
IKgut
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General Questions and Answers / Re: Quantumtransport through CdS-Nanowire
« on: February 28, 2011, 12:16 »
Thank you for advice...I try to build a device.....but my I_V curves are only linear....I dont know why?
I can´t load a build of my device...But mybe I can describe what I did....I build a CdS-Nanowire with Custom Builder....and make in Build Repitation....than I labeled all atoms at both end of the wire and make Au Atoms and other Ti-Atoms(I have delete S atoms). This procedre I make for 3 Layers at the end of wire, than I make a Device Mode. And I have a device like in a paper that you recommend on me. Than I made usually steps to simulate I-V curves like in tutorial...
But I see only linear characteristic? Why I dont see diode characteristic of this device? How I can change parameters than I see I-V-curves with physical reality?
Thank you
IKgut
I can´t load a build of my device...But mybe I can describe what I did....I build a CdS-Nanowire with Custom Builder....and make in Build Repitation....than I labeled all atoms at both end of the wire and make Au Atoms and other Ti-Atoms(I have delete S atoms). This procedre I make for 3 Layers at the end of wire, than I make a Device Mode. And I have a device like in a paper that you recommend on me. Than I made usually steps to simulate I-V curves like in tutorial...
But I see only linear characteristic? Why I dont see diode characteristic of this device? How I can change parameters than I see I-V-curves with physical reality?
Thank you
IKgut
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General Questions and Answers / Quantumtransport through CdS-Nanowire
« on: February 25, 2011, 14:02 »
Hallo, I have posted some questions in the forum and there good advices, thank you all very much....
But I have a general question. I want to build in modell a device with Schootky(Au) and Ohmic (In/Au) contact. Between them CdS Nanowire( There can beo other materials like Au or Pt for electodes). I have pricipal question: Is that poosible with ATK do buid a modell for that device and how would I do this?
P.S.: Maybe you I can tall me a bit a background for this calculation? I read some literaure from Datta to NEGF and Extend Huecke approach...Is that the way how ATK calculate electric properties like I-V-plots
Thank you very much
Ikgut
But I have a general question. I want to build in modell a device with Schootky(Au) and Ohmic (In/Au) contact. Between them CdS Nanowire( There can beo other materials like Au or Pt for electodes). I have pricipal question: Is that poosible with ATK do buid a modell for that device and how would I do this?
P.S.: Maybe you I can tall me a bit a background for this calculation? I read some literaure from Datta to NEGF and Extend Huecke approach...Is that the way how ATK calculate electric properties like I-V-plots
Thank you very much
Ikgut
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General Questions and Answers / Re: CdSe-Nanowire
« on: February 25, 2011, 11:34 »
....Hi
I have an question again....I try to set 10 and I see a wire but if I try to send it to scriptmanager, he see only one part, a unit cell, of my wire. What should I do to design a wire?
Thanky you for help
Ikgut
I have an question again....I try to set 10 and I see a wire but if I try to send it to scriptmanager, he see only one part, a unit cell, of my wire. What should I do to design a wire?
Thanky you for help
Ikgut
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General Questions and Answers / Re: Ohmic and shottky contact or how can I make different electrodes
« on: February 22, 2011, 18:37 »
Thank you Andreas,
I think I though a bit false....Because T thought that I need different Electrodes for self-energay matrices. Different electrodes are different boundings to nanowire...and that influence my transmission spectra like in Landau Formula....If Im true I dont understand why I can ignore a chemical nature of my electrodes?
IKgut
I think I though a bit false....Because T thought that I need different Electrodes for self-energay matrices. Different electrodes are different boundings to nanowire...and that influence my transmission spectra like in Landau Formula....If Im true I dont understand why I can ignore a chemical nature of my electrodes?
IKgut
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General Questions and Answers / CdSe-Nanowire
« on: February 22, 2011, 15:48 »
hallo
i try to build a CdSe nanowire but I have some problems. I make a repitation of my unit cell in Builder (hexagonal unit cel) and droped it in custom builder in nanowire builder....but its have not a cylindric form....I think I doing something false...but I dont know what...can you maybe help me with an advice
Thank you
IKgut
i try to build a CdSe nanowire but I have some problems. I make a repitation of my unit cell in Builder (hexagonal unit cel) and droped it in custom builder in nanowire builder....but its have not a cylindric form....I think I doing something false...but I dont know what...can you maybe help me with an advice
Thank you
IKgut
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General Questions and Answers / Re: Ohmic and shottky contact or how can I make different electrodes
« on: February 22, 2011, 13:48 »
.....You mean its not important that I have two different electrodes (In/Au und Au)?.....Or how I can say ATk that there different workfunction on electrodes....I mean if i apply voltage do drain Electrode its important for bandstructure an electric properties how high or deep is my Fermi Level in non-equilibrium state ( I mean thats not equal for In/Au or Ti/Pt and so on)..Or I misunderstood something in programm....
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General Questions and Answers / Ohmic and shottky contact or how can I make different electrodes
« on: February 22, 2011, 08:49 »
Hi all,
Im new at forum. I read all tutorials from ATK but I dont find a answer. I want to build some structure with different elektrodes In/Au and Au. One is Schottky an another is ohmic contact. I thought to set workfunktion in ATK but i dont find any possibility to do that. Between that ohmic and schottky contact I want set a graphene nanoribbon and than investigate gate and voltage depandece of i-v curves. Did somebody have an idea how i can do that?
Or maybe there is any tutorials for such device and problems?
Any advice will be great
Thank you
IKgut
Im new at forum. I read all tutorials from ATK but I dont find a answer. I want to build some structure with different elektrodes In/Au and Au. One is Schottky an another is ohmic contact. I thought to set workfunktion in ATK but i dont find any possibility to do that. Between that ohmic and schottky contact I want set a graphene nanoribbon and than investigate gate and voltage depandece of i-v curves. Did somebody have an idea how i can do that?
Or maybe there is any tutorials for such device and problems?
Any advice will be great
Thank you
IKgut
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