Abstract:
A graphoepitaxy template to align a self-assembled block polymer adapted to self-assemble into a 2-D array having parallel rows of discontinuous first domains extending parallel to a first axis, mutually spaced along an orthogonal second axis, and separated by a continuous second domain. The graphoepitaxy template has first and second substantially parallel side walls extending parallel to and defining the first axis and mutually spaced along the second axis to provide a compartment to hold at least one row of discontinuous first domains of the self-assembled block copolymer on the substrate between and parallel to the side walls, and separated therefrom by a continuous second domain. The compartment has a graphoepitaxial nucleation feature arranged to locate at least one of the discontinuous first domains at a specific position within the compartment. Methods for forming the graphoepitaxy template and its use for device lithography are also disclosed.
Abstract:
A method is disclosed to form a patterned template on a substrate, to direct orientation of a self-assemblable block copolymer. The method involves providing a resist layer of a positive tone resist on the substrate and overexposing the resist with actinic (e.g. UV) radiation by photolithography to expose a continuous region of the resist layer with a sub-resolution unexposed resist portion at the interface between the resist and the substrate. The resist portion remaining at the interface, after removal of the exposed region, provides a basis for a chemical epitaxy template. The method may allow for simple, direct photolithography to form a patterned chemical epitaxy template and optionally include an accurately co-aligned graphoepitaxy feature and/or a substrate alignment feature.
Abstract:
In an embodiment, there is provided an imprint lithography method that includes providing a first amount of imprintable medium on a first area of a substrate, the first amount of imprintable medium, when fixed, having a first etch rate; and providing a second amount of imprintable medium on a second, different area of the substrate, the second amount of imprintable medium, when fixed, having a second, different etch rate.
Abstract:
A method is disclosed to form a patterned template on a substrate, to direct orientation of a self-assemblable block copolymer. The method involves providing a resist layer of a positive tone resist on the substrate and overexposing the resist with actinic (e.g. UV) radiation by photolithography to expose a continuous region of the resist layer with a sub-resolution unexposed resist portion at the interface between the resist and the substrate. The resist portion remaining at the interface, after removal of the exposed region, provides a basis for a chemical epitaxy template. The method may allow for simple, direct photolithography to form a patterned chemical epitaxy template and optionally include an accurately co-aligned graphoepitaxy feature and/or a substrate alignment feature.
Abstract:
A method of forming a self-assembled block polymer layer, oriented to form an ordered array of alternating domains, is disclosed. The method involves providing a layer of the self-assemblable block copolymer on the substrate and depositing a first surfactant onto the external surface of the layer prior to inducing self-assembly of the layer to form the ordered array of domains. The first surfactant has a hydrophobic tail and a hydrophilic head group and acts to reduce the interfacial energy at the external surface of the block copolymer layer in order to promote formation of assembly of the block copolymer polymer into an ordered array having the alternating domains.
Abstract:
A method is disclosed to form a patterned epitaxy template, on a substrate, to direct self-assembly of block copolymer for device lithography. A resist layer on a substrate is selectively exposed with actinic (e.g. UV or DUV) radiation by photolithography to provide exposed portions in a regular lattice pattern of touching or overlapping shapes arranged to leave unexposed resist portions between the shapes. Exposed or unexposed resist is removed with remaining resist portions providing the basis for a patterned epitaxy template for the orientation of the self-assemblable block copolymer as a hexagonal or square array. The method allows for simple, direct UV lithography to form patterned epitaxy templates with sub-resolution features.
Abstract:
A graphoepitaxy template to align a self-assembled block polymer adapted to self-assemble into a 2-D array having parallel rows of discontinuous first domains extending parallel to a first axis, mutually spaced along an orthogonal second axis, and separated by a continuous second domain. The graphoepitaxy template has first and second substantially parallel side walls extending parallel to and defining the first axis and mutually spaced along the second axis to provide a compartment to hold at least one row of discontinuous first domains of the self-assembled block copolymer on the substrate between and parallel to the side walls, and separated therefrom by a continuous second domain. The compartment has a graphoepitaxial nucleation feature arranged to locate at least one of the discontinuous first domains at a specific position within the compartment. Methods for forming the graphoepitaxy template and its use for device lithography are also disclosed.
Abstract:
A method is disclosed to form a patterned epitaxy template, on a substrate, to direct self-assembly of block copolymer for device lithography. A resist layer on a substrate is selectively exposed with actinic (e.g. UV or DUV) radiation by photolithography to provide exposed portions in a regular lattice pattern of touching or overlapping shapes arranged to leave unexposed resist portions between the shapes. Exposed or unexposed resist is removed with remaining resist portions providing the basis for a patterned epitaxy template for the orientation of the self-assemblable block copolymer as a hexagonal or square array. The method allows for simple, direct UV lithography to form patterned epitaxy templates with sub-resolution features.
Abstract:
In an embodiment, there is provided an imprint lithography method that includes providing a first amount of imprintable medium on a first area of a substrate, the first amount of imprintable medium, when fixed, having a first etch rate; and providing a second amount of imprintable medium on a second, different area of the substrate, the second amount of imprintable medium, when fixed, having a second, different etch rate.
Abstract:
A method of forming a patterned chemical epitaxy template, for orientation of a self-assemblable block copolymer including first and second polymer blocks, on a surface of a substrate, the method including applying a primer layer of a primer composition to the surface, the primer composition including a first polymer moiety having a chemical affinity with the first polymer blocks and a second polymer moiety having a chemical affinity with the second polymer blocks, selectively exposing the surface, the primer layer and any overlying layer to actinic radiation to provide exposed and unexposed regions, to render labile the first polymer moiety in the exposed region, and removing the labile first polymer moiety from the exposed region to deplete the primer layer surface in the exposed region of first polymer moiety to form the patterned chemical epitaxy template.