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1. Tuning Base and Collector Currents – All Regions

2. Tuning the Base Current – All Regions

3. Tuning the Collector Current – All Regions

4. The Base Current Profile – Medium Injection

5. The Base Current Profile – Low Injection

6. Conclusions

If you follow this order, there should be a reasonable correlation between measured and simulated data. Most of the tuning parameters, however, have some degree of interdependency to the extent of which is also device design specific. Therefore, some degree of iteration of the tuning parameters is to be expected.

When tuning bipolar transistors, there is a greater emphasis to accessing tuning parameters by using the device simulator, ATLAS, compared to optimizing MOSFETs, where most tuning parameters are process-related. A powerful combination is the tuning of a BiCMOS process where you can use the MOSFET part of the process flow to tune the process parameters, while using the Bipolar part of the flow to tune ATLAS. This technique should yield a high degree of predictability in the results.

Tuning the process simulator parameters in ATHENA are mainly required to model effects, such as the implantation induced defect enhanced diffusion responsible for the Emitter Push Effect, which is essential to obtain the correct depth of the base-collector junction. The correct process modeling of the out diffusion of dopant from the poly-emitter into the mono-crystalline substrate is also critical to obtaining well-matched I-V curves. Another critical process modeling area is the base implant, because it is essential to match measured and modeled base resistance for correct modeling of the collector current. These and other issues are discussed in these sections.

7.9.1: Tuning Base and Collector Currents – All Regions

The most important parameter to model the general level of base and collector currents is the device measurement temperature. The base and collector currents are strongly influenced by temperature changes, as small as a few degrees centigrade. A significant effort should be made to determine the exact temperature of the device during measurements before calibration is attempted. This temperature should be input into ATLAS in the MODELS statement using the TEMPERATURE=<n>parameter. An increase in temperature will cause an increase in base and collector currents.

7.9.2: Tuning the Base Current – All Regions

A critical region for poly-emitter bipolar devices is the interface between the poly-emitter and the mono-crystalline silicon. This region is difficult to process simulate directly as the interface between the polysilicon emitter and single crystalline silicon usually consists of a thin, uneven and possibly non-continuous film of oxide. This is simulated by calibrating the overall effect of this interface with ATLAS. The tuning parameter is the surface recombination velocity at this interface for electrons (VSURFN for PNP devices) or holes (VSURFP for NPN devices). This will only be effective for thin emitters where at least a fraction of the holes (for NPN devices) can reach the emitter before recombination.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Solid state physics and devices-the harbinger of third wave of civilization. OpenStax CNX. Sep 15, 2014 Download for free at http://legacy.cnx.org/content/col11170/1.89
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