I am looking for a good source of information
on the work function of transition metal and
their oxides/nitrides. I am also interested
in a comprehensive list for normal metals.
Also, is there some collection of band data
of semiconducting oxides? I found a good
review paper for compund semiconductors, but
so far only scattered data for oxides.
If you are really interested in getting electrons out of
a solid and into vacuum, there was a review of work function
data (certainly on semiconductors, I believe that it also
covered metals) by G.W. Gobeli and F.G. Allen in the mid
1960s. I think it was in one of the volumes of the Willardson
and Beer series. The people who are able to get data on this
sort of thing are those who have x-ray photoemission spectroscopy
setups. There has been a group at the Rockwell Science Center
(or whatever it is nowadays) doing this for a long time: J.R. Waldrop,
R.W. Grant, et al., but I don't know if they ever looked at oxides.
On the other hand, if you really want to infer energy-level
alignments at some solid-solid interface, you should be aware that,
though widely quoted and believed, work-function and electron-affinity
rules are not in fact correct. (Herb Kroemer published several papers
in the mid 1970s on this topic.) Now, it is true that such rules are
most accurate when one of the materials is a reasonably ionic, wide
bandgap material (Paper by Tom McGill, Carver Mead, early 1970s as I
recall, on systematics of Schottky barriers.) But, if your application
is really to interface alignments, it is much better to seek data
directly on the interface of interest.
- Bill Frensley
Thank you very much for your pointers. In fact, I was mainly looking
for data on metal/semiconductor contacts. I am aware of problems
with the correctness of this approach, but the vacuum work functions
give at least some ballpark numbers.
I found a lot of data I was looking for in the following paper
and the quoted references:
author="Xu, Y. and Schoonen, M.A.",
title="The absolute energy positions of conduction and valence bands of
selected semiconducting minerals",
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.