TEMPLATE, IMPRINT DEVICE, AND CONTROL METHOD
A template for imprinting according to an embodiment configured to be pressed onto a semiconductor wafer to transfer thereto a pattern, and may include an imprint mask on which the pattern is formed, a photomask substrate on which the imprint mask is provided, and a plurality of deformation controllers that are provided at the photomask substrate outside a circumference of the imprint mask, and are configured to deform the photomask substrate.
1 . A template for imprinting, configured to be pressed onto a semiconductor wafer to transfer thereto a pattern, the template comprising:
an imprint mask on which the pattern is formed;
a mask substrate on which the imprint mask is provided; and
a plurality of deformation controllers that are provided at the mask substrate outside a circumference of the imprint mask, and are configured to deform the mask substrate.
2 . The template according to claim 1 , wherein
the imprint mask is provided on a first surface of the mask substrate, and
each of the deformation controllers comprises a first deformation member that is provided on a second surface on the opposite side of the first surface of the mask substrate, and is configured to deform the mask substrate by expanding or contracting.
3 . The template according to claim 2 , wherein each of the deformation controllers further comprises a second deformation member that is provided on the first surface of the mask substrate outside the circumference of the imprint mask so as to form a pair with the first deformation member, and is configured to deform the mask substrate by expanding or contracting.
4 . The template according to claim 1 , wherein
each of the deformation controllers comprises:
a plate-like deformation substrate;
a first deformation member provided on a first surface of the deformation substrate; and
a second deformation member provided on a second surface on the opposite side of the first surface of the deformation substrate, and
a fourth surface of the second deformation member on the opposite side of a third surface of the second deformation member in contact with the deformation substrate is bonded to the mask substrate so that each of the deformation controllers is bonded to the mask substrate.
5 . The template according to claim 4 , wherein the deformation substrate has the same cross-sectional stiffness as that at a portion of the mask substrate provided with each of the deformation controllers.
6 . The template according to claim 1 , wherein
the mask substrate comprises a thin portion obtained by thinning a central portion of the mask substrate into a counterbore structure and a thick portion located outside a circumference of the thin portion, and
the deformation controllers are provided at the thin portion outside the circumference of the imprint mask.
7 . The template according to claim 1 , wherein each of the deformation members comprises a piezoelectric thin film.
8 . The template according to claim 1 , wherein the deformation controllers are fixed with a detachable adhesive material to the mask substrate outside a circumference of the imprint mask.
9 . An imprint device comprising:
the template as claimed in claim 1 ;
a vacuum chuck having a circular cylindrical shape, the vacuum chuck being configured to hold the template by sucking an outer circumferential portion of the mask substrate; and
a controller configured to control the deformation controllers, wherein
the template comprises:
a plurality of terminals that are provided at the mask substrate outside a circumference of the deformation controllers, and are electrically connected to any of the deformation controllers; and
a plurality of connecting parts that are provided inside the circular cylindrical shape of the vacuum chuck, that are come into contact with the terminals when the vacuum chuck abuts on the mask substrate, and that are electrically connected to the controller.
10 . The imprint device according to claim 9 , wherein
the imprint mask is provided on a first surface of the mask substrate,
each of the deformation controllers comprises:
a first deformation member that is provided on a second surface on the opposite side of the first surface of the mask substrate, and is configured to deform the mask substrate by expanding or contracting; and
a second deformation member that is provided on the first surface of the mask substrate outside the circumference of the imprint mask so as to form a pair with the first deformation member, and is configured to deform the mask substrate by expanding or contracting, and
the controller is configured to apply substantially the same amount of expansion or contraction to the first and the second deformation members forming a pair with the mask substrate interposed therebetween among the first deformation members and the second deformation members arranged on the first surface and the second surface of the mask substrate so as to surround the imprint mask, and to thereby give the mask substrate a partial expansive or contractive deformation without producing a curvature of the mask substrate.
11 . The imprint device according to claim 9 , wherein the controller is configured to give the first and the second deformation members forming a second pair that are arranged opposite to the first and the second deformation members forming a first pair with the imprint mask interposed therebetween a larger amount of expansion or contraction than that given to the first and the second deformation members forming the first pair, and to thereby give the mask substrate a partial expansive or contractive deformation without producing a curvature deformation of the mask substrate.
12 . The imprint device according to claim 9 , wherein
each of the deformation controllers comprises:
a plate-like deformation substrate;
a first deformation member provided on a first surface of the deformation substrate; and
a second deformation member provided a second surface on the opposite side of the first surface of the deformation substrate,
a fourth surface of the second deformation member on the opposite side of a third surface of the second deformation member in contact with the deformation substrate is bonded to the mask substrate so that each of the deformation controllers is bonded to the mask substrate, and
the controller is configured to give each of the deformation controllers a deformation that gives the first, deformation member a larger strain than that of the second deformation member so as to give the mask substrate a curvature deformation.
13 . The imprint device according to claim 9 , wherein
each of the deformation controllers comprises:
a plate-like deformation substrate;
a first deformation member provided on a first surface of the deformation substrate; and
a second deformation member provided on a second surface on the opposite side of the first surface of the deformation substrate,
a fourth surface of the second deformation member on the opposite side of a third surface of the second deformation member in contact with the deformation substrate is bonded to the mask substrate so that each of the deformation controllers is bonded to the mask substrate, and
the controller is configured to give each of the deformation controllers a deformation that gives the second deformation member a larger strain than that of the first deformation member so as to give the mask substrate a partial expansive or contractive deformation without producing a curvature of the mask substrate.
14 . A control method for controlling deformation of the template according to claim 1 , the control method comprising:
identifying correspondence relations between voltage values of voltages applied to the deformation controllers and amounts of deformation of the template at the time of application of the voltages; and
controlling the deformation of the template based on the identified correspondence relations.