Abstract:
A method of forming a semiconductor device structure comprises forming a template material over a substrate, the template material exhibiting preferential wetting to a polymer block of a block copolymer. A positive tone photoresist material is formed over the template material. The positive tone photoresist material is exposed to radiation to form photoexposed regions and non-photoexposed regions of the positive tone photoresist material. The non-photoexposed regions of the positive tone photoresist material are removed with a negative tone developer to form a pattern of photoresist features. The pattern of photoresist features and unprotected portions of the template material are exposed to an oxidizing plasma to form trimmed photoresist features and a pattern of template features. The trimmed photoresist features are removed with a positive tone developer. Other methods of forming a semiconductor device structure, and a semiconductor device structure are also described.