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- W2038416085 abstract "As stepper field sizes increase, integrated circuit manufacturers are faced with a new series of challenges in matching exposure tools. Existing fabrication lines with smaller field steppers must determine how to match new, large field tools to their existing steppers. For optimum efficiency, one would prefer to expose a larger number of die per field on the larger field lenses. From a manufacturing standpoint, it is also necessary to expose some layers of these devices on the smaller field tools, which are limited to a smaller number of die per field. This requires matching non-concentric fields, placing two or more exposure fields of the smaller lenses within a single exposure field of the larger lenses. This paper discusses the potential overlay problems associated with non-concentric matching, and presents our methodology for determining the overlay capability and optimum matching strategy for such a scenario. We present data and simulations showing how overlay is affected by different configurations of these non-concentric fields, and solutions to minimize total overlay errors." @default.
- W2038416085 created "2016-06-24" @default.
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- W2038416085 date "1994-05-17" @default.
- W2038416085 modified "2023-09-27" @default.
- W2038416085 title "<title>Minimization of total overlay errors when matching nonconcentric exposure fields</title>" @default.
- W2038416085 doi "https://doi.org/10.1117/12.175466" @default.
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