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: http://www.stsci.edu/instrument-news/handbooks/wfpc2/W2_33.html
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The Loral CCDs are illuminated from the 'front' surface, i.e., the light passes through the polysilicon gate structure overlying the 10 micron thick active silicon layer. Because the WFPC2 devices are front-side illuminated and supported by a bulk silicon substrate, the CCD surface is flat, which has reduced the uncertainties in the astrometric calibration to about the 1/10 pixel level.
In this section the performance of the WFPC2 CCDs is reviewed, and compared to the WF/PC-1 devices. A summary of device characteristics is given in Table 4.1.