Structure and method for determining a defect in integrated circuit manufacturing process
The present invention discloses a structure and method for determining a defect in integrated circuit manufacturing process, wherein the structure comprises a plurality of normal active areas formed in a plurality of first arrays and a plurality of defective active areas formed in a plurality of second arrays. The first arrays and second arrays are interlaced, and the defect is determined by monitoring a voltage contrast from a charged particle microscope image of the active areas.
1. A test structure for determining a defect in integrated circuit manufacturing process, comprising:
a plurality of normal active areas formed in a plurality of first arrays on a die; and
a plurality of defective active areas formed in a plurality of second arrays on the die, wherein said first arrays and said second arrays are interlaced,
wherein said defect is determined by monitoring a voltage contrast from a charged particle microscope image of said active areas.
2. The test structure for determining a defect of claim 1 , wherein said defect is a void-induced short of said normal active areas or a non-open contact of said normal active areas.
3. The test structure for determining a defect of claim 2 , wherein said void-induced short is determined by monitoring the bright voltage contrast image of said active areas.
4. The test structure for determining a defect of claim 2 , wherein said non-open contact is determined by monitoring the dark voltage contrast image of said active areas that has large voltage contrast difference.
5. The test structure for determining a defect of claim 1 , wherein said active areas are active areas on the die of semiconductor devices.
6. The test structure for determining a defect of claim 5 , wherein said normal active areas are active areas of semiconductor devices having heavily n-type doped source and drain, and p-type doped well (N+/P-well).
7. The test structure for determining a defect of claim 5 , wherein said detective active areas are active areas of semiconductor devices having heavily p-type doped source and drain with p-type doped well (P+/P-well), heavily n-type doped source and drain with n-type doped well (N+/N-well), heavily p-type doped source and drain with n-type doped well (P+/N-well), p-type doped well (P-well/P-substrate), n-type doped well (N-well/P-substrate), or p-type doped substrate.
8. The test structure for determining a defect of claim 1 , wherein every two of said first arrays or second arrays on the die are spaced apart by at least one of said second arrays.
9. The test structure for determining a defect of claim 1 , wherein at least two of said first arrays or second arrays on the die are formed side by side.