Sub-20-nm Alignment in Nanoimprint Lithography Using Moire Fringe Export

@article{citeulike:4408267, abstract = {Accurate multi-level overlay capability for nanoimprint lithography (NIL) is essential to integrated circuit manufacturing and other multilayer imprint applications. Using the beat grating image (Moire fringe) generated by overlaying two sets of gratings that have slightly different periods, we obtained an alignment signal with a sensitivity better than 10 nm in nanoimprint lithography. The alignment signal is, as expected, independent of the size of the gap between the wafer and the imprint mold. We achieved a single-point overlay accuracy (error distribution) of sub-20 nm between the first and second imprinted layers by using two sets of Moire fringes. With higher precision nanopositioning stages, better single-point alignment accuracy is expected. Furthermore, we achieved sub-150 nm alignment over an area of 1 sq in and sub-250 nm over the entire area of a 4 in wafer using simple low-resolution stages without temperature control or wafermold mismatch compensation. With better stages, precision temperature control, and wafermold mismatch compensation, we believe that much higher overlay alignment accuracy over large areas (either in a 1 sq in die or a full wafer) is feasible.}, author = {Li, Nianhua and Wu, Wei and Chou, Stephen Y.}, citeulike-article-id = {4408267}, citeulike-linkout-0 = {http://dx.doi.org/10.1021/nl0603395}, citeulike-linkout-1 = {http://pubs.acs.org/doi/abs/10.1021/nl0603395}, day = {1}, doi = {10.1021/nl0603395}, journal = {Nano Letters}, keywords = {lithography, nanofabrication}, month = {November}, number = {11}, pages = {2626--2629}, posted-at = {2009-04-26 21:31:36}, priority = {2}, title = {Sub-20-nm Alignment in Nanoimprint Lithography Using Moire Fringe}, url = {http://dx.doi.org/10.1021/nl0603395}, volume = {6}, year = {2006} }

TY - JOUR ID - citeulike:4408267 L3 - citeulike-article-id:4408267 N2 - Accurate multi-level overlay capability for nanoimprint lithography (NIL) is essential to integrated circuit manufacturing and other multilayer imprint applications. Using the beat grating image (Moire fringe) generated by overlaying two sets of gratings that have slightly different periods, we obtained an alignment signal with a sensitivity better than 10 nm in nanoimprint lithography. The alignment signal is, as expected, independent of the size of the gap between the wafer and the imprint mold. We achieved a single-point overlay accuracy (error distribution) of sub-20 nm between the first and second imprinted layers by using two sets of Moire fringes. With higher precision nanopositioning stages, better single-point alignment accuracy is expected. Furthermore, we achieved sub-150 nm alignment over an area of 1 sq in and sub-250 nm over the entire area of a 4 in wafer using simple low-resolution stages without temperature control or wafermold mismatch compensation. With better stages, precision temperature control, and wafermold mismatch compensation, we believe that much higher overlay alignment accuracy over large areas (either in a 1 sq in die or a full wafer) is feasible. IS - 11 JF - Nano Letters EP - 2629 TI - Sub-20-nm Alignment in Nanoimprint Lithography Using Moire Fringe VL - 6 SP - 2626 KW - lithography KW - nanofabrication AU - Li, Nianhua AU - Wu, Wei AU - Chou, Stephen PY - 2006/11/01/ UR - http://dx.doi.org/10.1021/nl0603395 ER -