Visual Industry Guide
Image Sensors World Go to the original article...
Toshiba patent application US20150008482 "Semiconductor device and manufacturing method thereof" by Motoyuki Sato says that making SiGe superlattice under transfer gate can drastically reduce the influence of SiO2/Si interface traps that potentially can capture photoelectrons during the transfer. The dark current and white pixel defects are also said to be reduced:
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