Not a single wafer, but the sensor built for the Large Synoptic Survey Telescope is a ~64x64cm 3.2-gigapixel CCD, made of 189 4x4cm chips on the same sensor bed

Not a single wafer, but the sensor built for the Large Synoptic Survey Telescope is a ~64x64cm 3.2-gigapixel CCD, made of 189 4x4cm chips on the same sensor bed[0]. I suspect the cost was in the millions of dollars for the one-of-a-kind sensor, but I bet you could get a great deal on a second one since they've already done the R&D! [0]https://en.wikipedia.org/wiki/Vera_C._Rubin_Observatory#Camera https://en.wikipedia.org/wiki/Vera_C._Rubin_Observatory#Came...