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>>>>> On 8 Nov 92 18:12:58 GMT, vcm@ccwf.cc.utexas.edu (V. Chandramouli) said:

V.> In article <1992Nov5.081229.2190@nntp.hut.fi> you write:
>
>  Howdy,
>
>  Does anybody know where to get simulation programs to do bandstructure
>and carrier density calculations for hetrostructures, preferably for ones
>containing several stacked quantum wells ? We have one written here in HUT, 
>but it only handles one half-well, not a set of complete wells ( a super-
>lattice) or eg. two interacting wells.
>
>  Thanks,
>           Mikko Kiviranta
>

V.> I am interested in your model -- can I have a copy of it ?

V.> For stacked quantum wells, I am aware of several papers in the 
V.> literature that describes how to calculate the band structure.
V.> If you are interested in heterostructure device simulation you should
V.> consult the software from Purdue University (Mark Lundstrom's group)
V.> called PUPHS.  This program can (I think) calculate carrier
V.> densities in a heterostructure.   If you need more information on 
V.> the contact e-mail address and bibliography please send me an
V.> e-mail (mouli@emx.cc.utexas.edu).
V.> Chandramouli.                                 mouli@emx.cc.utexas.edu
V.> ---------------------------------------------------------------------
V.> Microelectronics Research Center in the University of Texas at Austin
V.> ---------------------------------------------------------------------

This might be relevant:

Here at the IuE we are working, amongst other things, on extending our
device simulator MINIMOS to HEMTs and MODFETs. In order to have a
validation tool against which to gauge pre-release simulations, a
co-worker and I wrote a standalone self-consistent
Schroedinger-Poisson solver which can handle an arbitrary number of
heterolayers. As well as carrier densities and bandstructures, it
works out capacitance-voltage curves, has incomplete donor ionization,
exchange-correlation effects (sort of) and an educated initial guess
for single-well heterostructures. I ought to add as a caveat that the
code (well, my part of it at least) is a typical research product,
i.e. ugly, inefficient and a wonderful example of feet-first
programming. Moreover, it has been used principally to work out C-V
curves for HEMTs, and as such has not had much experience with
superlattices and/or multiple quantum wells.

Still, E-mail me if you are interested.

Cristiano



--

Cristiano Sala                                            sala@iue.tuwien.ac.at
Practice random kindness              and              senseless acts of beauty