Etch mask

Etch mask 1
  • Ge sensor, backside
  • Si substrate
  • Mask: low stress Si3N4
  • KOH wet etching

Products:
 
Etch mask 2
  • Ge sensor, frontside
  • Si substrate
  • low stress Si3N4 etch stop and isolation layer
  • KOH wet etching

Products: