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Below is a picture of a pad detector, with contacts made in double-metal technology. With two layers of metalization available, the traces can be bought out to the radial perimeter on the silicon itself (top in this picture).

advantages over single-metal:

• Eliminates specialized kapton cable
• Reduces wirebonding
• Facilitates detector probing
• Facilitates assembly, handling
• Increases yield
• Sequential readout