Terry,
I just googled geometric quantum efficiency which is as I recall what Sony use.
Here it is:
http://books.google.com.au/books?id=...ciency&f=false
Translation:
You multiply QE by the sensor ability to cover the surface of the chip (fill factor - how much of a gap between pixels?).
I assume fill factor is a number greater than 1 hence the high QE numbers Sony presents. Although fill factor you would think would be a number less than 1 (1 being the whole area??). Otherwise the QE would be much greater than 77% and that would put it up with an ST10. Unlikely or the Sony chipped cameras would be leaving the Kodak ones for dead in astrophotography and they aren't.
Anyway I suspect its a marketing ploy using definitions that present your product in a better than normal way.
Greg.