Patent ID: 7842442
Filing Date: 2010-11-30
Classification: G03F

Abstract:
1. A method, comprising: generating overlay correction data for a plurality of different combinations of a first device layer and a second device layer of a microstructure device, said first device layer being defined by one or more first photomasks, said second device layer being defined by one or more second photomasks, said first and second device layers being formed by using a plurality of lithography tools, said overlay compensation data obtained from a first plurality of measurement positions within said first and second photomasks; forming said first device layer on a first product substrate using one of said first photomasks and one of said plurality of lithography tools; and aligning one of said second photomasks, used in one of said plurality of lithography tools, to said first device layer formed on said first product substrate by using said overlay correction data and an overlay measurement data obtained from a second plurality of measurement positions of a previously processed substrate having formed thereon said first and second layers, said second plurality of measurement positions being less than said first plurality of measurement positions.