Infineon Technologies Ag

Ansgar Teipel

Hans-Georg Froehlich

Lothar Bauch

Stefan Gruss

Manuel Vorwerk

A method for correcting structure-size-dependent positioning errors during the photolithographic projection by an exposure apparatus and the use thereof includes providing an exposure apparatus for exposing a plurality of exposure fields and a simulation model of the exposure apparatus for specifying correction values for intra-field errors, providing a first pattern with first structure elements and first measurement marks, which, in the case of a projection, are beset by a first positioning error and a second positioning error dependent on the dimensions and the position in the exposure field, providing a correction function suitable for specifying the first and the second positioning error, determining an average relative positioning error including the first and the second positioning error, calculating correction values for the control of the exposure apparatus, and transmitting the correction values to the exposure apparatus so that subsequent exposures are performed with an improved overlay.

Method for correcting structure-size-dependent positioning errors in photolithography

A method, suitable to photolithographie projection, for detecting the positioning errors of circuit patterns during the transfer by a mask into layers of a substrate of a semiconductor wafer. After the transfer of at least one multiple arrangement of a first test structure into at least one resist layer above the substrate, wherein the first test structure includes a first circuit pattern, at least one first overlay mark and at least one first micropatterned alignment mark, the values of a first positioning error of the first circuit patterns relative to the first overlay marks and the first micropatterned alignment marks are determined for each element of the at least one multiple arrangement.

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Dresden, Germany

Ansgar Teipel