Nanoimprint lithography processes for switching mechanical properties of imprint materials
A method is described for modifying the mechanical properties of NIL materials. The method includes applying an imprint mask to a nano-imprint lithography (NIL) material layer to create an imprinted NIL material layer, with the NIL material layer comprised of a NIL material. The method further includes detaching the imprinted NIL material layer from the imprint mask, with the modulus level of the NIL material below a flexibility threshold to cause a shape of the imprinted NIL material layer to remain unchanged after detachment. The modulus level of the NIL material of the imprinted NIL material layer is increased beyond a strength threshold to create a first imprint layer, with the imprint layer having a structure that remains unaffected by a subsequent process to form a second imprint layer matching a master mold pattern.
1. A method, comprising:
infusing a plasticizer into a nano-imprint lithography (NIL) material to form an infused NIL material having Young's modulus below 500 MPa, wherein the plasticizer comprises dibutyl phthalate;
applying an imprint mask to an infused NIL material layer to create an imprinted NIL material layer, the infused NIL material layer comprised of the infused NIL material;
detaching the imprinted NIL material layer from the imprint mask; and
removing the plasticizer from the imprinted NIL material to form an imprint layer having Young's modulus greater than 1 GPa;
wherein removing the plasticizer from the NIL material further comprises: increasing a temperature and decreasing a pressure of a chamber containing the imprinted NIL material layer, detecting the plasticizer which has been removed from the NIL material and within the space of the chamber, and determining that the amount of plasticizer in the NIL material is minimal when the level of plasticizer falls below a threshold level within the chamber.