L
Larry Brasfield
Guest
"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote
in message news:lkvp31t0osh95889anttbj98c1aq1gl9oq@4ax.com...
I mentioned. There are a few others. You have
to add them all up if you're nuts enough to want
to predict how they will show up in real devices.
That is an interesting effect, if it occurs. I have
not researched or studied light emission by
silicon diodes, having learned in school that
Si is very inefficient at that due to its indirect
bandgap structure. What puzzles me about
the "emission while zenering" claim is that the
extra carriers that have tunneled across the
junction are just like the ones normally present.
It would only be via recombination that there
would be emission, and the majority carrier
injection at any normal current is low enough
that it should not change the density that much.
The clincher is that minority carrier generation
is essentially unchanged, and that would limit
the emission rate whether some extra majority
carriers were floating around or not. So I am
quite skeptical of that claim. (But willing to be
educated by anybody who really knows better.)
Si transistors, I would love to see a link or a
few keywords to aid a search.
if it meant what you suggest. I tried to avoid duplicating
my criteria for asking about that, already mentioned here.
Why would I consider someone a poser who did not
know that? If you knew me, I would not have to tell
you the answer: Only if the interviewee's resume claims
an understanding of semiconductor physics do I even
bring out that question. (That's why I've only done it
maybe 5-8 times.) Even then, if they are able to give
a wrong answer, but with some supporting reasoning
that makes sense (given their assumptions), I go on
to discover if they can back out when we revisit the
wrong assumption(s). (The few who get this wrong
instead of just giving up usually have forgotten some
basics of PN junction tunneling.)
I've never been the hiring authority, but I have often
given a good hire recommendation to applicants who
get a few things wrong in a tough interview yet are
able to get to the issues when discussing those errors.
Likewise, I have given a definite thumbs-down to a
lot of people who are smart but much less smart than
they imagine or pretend.
And just to quash the notion that I conduct a mean
interview, several of the people who suffered thru
it are among my longtime friends. One of them
even shows up here from time to time.
--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.
in message news:lkvp31t0osh95889anttbj98c1aq1gl9oq@4ax.com...
I'm only stating the effect of the 2nd order effect
I mentioned. There are a few others. You have
to add them all up if you're nuts enough to want
to predict how they will show up in real devices.
That is an interesting effect, if it occurs. I have
not researched or studied light emission by
silicon diodes, having learned in school that
Si is very inefficient at that due to its indirect
bandgap structure. What puzzles me about
the "emission while zenering" claim is that the
extra carriers that have tunneled across the
junction are just like the ones normally present.
It would only be via recombination that there
would be emission, and the majority carrier
injection at any normal current is low enough
that it should not change the density that much.
The clincher is that minority carrier generation
is essentially unchanged, and that would limit
the emission rate whether some extra majority
carriers were floating around or not. So I am
quite skeptical of that claim. (But willing to be
educated by anybody who really knows better.)
Those wouldn't be GaAs transistors? If it was
Si transistors, I would love to see a link or a
few keywords to aid a search.
Please, John. That "appropriate" would be poorly used
if it meant what you suggest. I tried to avoid duplicating
my criteria for asking about that, already mentioned here.
Why would I consider someone a poser who did not
know that? If you knew me, I would not have to tell
you the answer: Only if the interviewee's resume claims
an understanding of semiconductor physics do I even
bring out that question. (That's why I've only done it
maybe 5-8 times.) Even then, if they are able to give
a wrong answer, but with some supporting reasoning
that makes sense (given their assumptions), I go on
to discover if they can back out when we revisit the
wrong assumption(s). (The few who get this wrong
instead of just giving up usually have forgotten some
basics of PN junction tunneling.)
I've never been the hiring authority, but I have often
given a good hire recommendation to applicants who
get a few things wrong in a tough interview yet are
able to get to the issues when discussing those errors.
Likewise, I have given a definite thumbs-down to a
lot of people who are smart but much less smart than
they imagine or pretend.
And just to quash the notion that I conduct a mean
interview, several of the people who suffered thru
it are among my longtime friends. One of them
even shows up here from time to time.
--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.
480)460-2350 | |