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Todd Boroson is project scientist at NOAO for their large chip cameras.
At the time of visiting they had a 
thick, 
and two, 
devices
with peak response of 40% and 80% respectively.
The chips appear to suffer from regular fringing at the 50% level
beyond 
. Todd informed us that he believed Mike Lesser
had now moved the peak of the AR coatings from 
to 
which has resulted in a high peak QE of 
. The coating
is HfO and there are no fringes to the 5% level.
The NOAO goal is to equip the telescope with a Quad-mosaic of 4,
thinned, edge-buttable devices. The matrix which is
to support the CCDs has been made co-planar to 
after
machining shims under the CCD package. The separate
detectors within the mosaic are aligned rotationally to 1 or 2
pixels. The Loral wafer run produced 60 working devices out of a
possible 80, but, the devices can not really be quantified until
after they have been mounted.
They also plan to put together a mosaic of 
devices of
pixel, 3-edge buttable CCDs with 16 outputs.