In the wafer factory, there are dummy wafer, test wafer,prime wafer called, what are the roles of these films? dummy waf
The English literal translation of dummy is “fake, simulation”, dummy wafer can also be called fake film, block film. There are generally no graphics, or only a few layers of graphics, the main application scenarios:
- It is used for debugging and calibration of semiconductor equipment to ensure that the equipment is in the best condition before formal production.
- When introducing new processes or adjusting existing processes, dummy pieces are used for testing and optimization to reduce risks to mass production pieces. test wafer
The test wafer (engineering wafer) has a complete process flow, including a variety of graphics and structures of the wafer. Main functions: - In the process of introducing new chip products, test pieces are used to verify and optimize the manufacturing process of new products, and finally achieve mass production.
2, when there is a process problem on the production line, do the corresponding DOE test to improve the process. prime wafer
Mass production wafers are used to produce semiconductor devices that need to be shipped to customers. Strict quality control is carried out in the production process of mass production wafers to ensure that products meet customer requirements.
Why divide these types of wafers?
Mainly from the cost and importance of consideration.
