Photoactive adhesion promoter
View Patent ↗An adhesion promoter to help reduce semiconductor process effects, such as undesired line edge roughness, insufficient lithographical resolution, and limited depth of focus problems associated with the removal of a photoresist layer. A photoactive adhesion promoter (PAG) is described which helps reduce these and other undesired effects associated with the removal of photoresist in a semiconductor manufacturing process.
1. A process comprising:
applying a photoactive adhesion promoter to a semiconductor wafer, the photoactive adhesion promoter comprising an adhesion promoter, a photoacid generator linked to the adhesion promoter by a first non-cyclic organic chain, and a photobase generator linked to the adhesion promoter by a second non-cyclic organic chain;
wherein the photoacid generator and photobase generator generate an acid and a base, respectively, in response to being exposed to an incident radiation;
applying a photoresist layer superjacent to the photoactive adhesion promoter; and
removing the photoresist layer.
2. The process of claim 1 wherein solubility of the photoresist layer is enhanced by the photoactive adhesion promoter in an interface region of the photoactive adhesion promoter and the photoresist layer.
3. The process of claim 1 wherein the photoactive adhesion promoter reduces swing effects of radiation incident to the photoresist layer.
4. The process of claim 1 wherein applying the photoactive adhesion promoter comprises depositing trimethoxysilane superjacent the semiconductor wafer.
5. The process of claim 4 wherein the photoactive adhesion promoter is applied to the wafer in a solution of ethyl lactate.
6. The process of claim 5 further comprising baking the wafer to bond the photoactive adhesion promoter to the wafer.
7. The process of claim 6 wherein the photoactive adhesion promoter bonds to the photoresist layer via a chemical catalyst group comprising nonafluorobutanesulfonate.
8. The process of claim 1 wherein the photoacid generator comprises a photon harvesting group and a catalyst group, the photon harvesting group comprising methyldiphenylsulfonium and linked to the adhesion promoter by the non-cyclic organic chain.
9. A method comprising:
forming a photoactive adhesion promoter comprising trimethoxysilane, methyldiphenylsulfonium, a non-cyclic organic chain linking the trimethoxysilane to the methyldiphenylsulfonium, and nonafluorobutanesulfonate, the photoactive adhesion promoter being formed to enhance solubility of a photoresist layer applied superjacent to the photoactive adhesion promoter;
applying the photoactive adhesion promoter to a semiconductor substrate;
depositing a photoresist layer superjacent the photoactive adhesion promoter;
exposing the photoresist layer to light, the exposing causing a photoactive substance of the photoactive adhesion promoter to be generated so that an interface region between the photoactive adhesion promoter and the photoresist layer becomes doped with the photoactive substance to enhance solubility of the photoresist layer;
performing a process to remove the photoresist layer and the photoactive adhesion promoter.
10. The method of claim 9 wherein the photoactive substance is an acid.
11. The method of claim 10 wherein the photoactive substance is a base.
12. A process comprising:
applying a photoactive adhesion promoter to a semiconductor wafer, the photoactive adhesion promoter comprising an adhesion promoter and a photoacid generator linked to the adhesion promoter by a first non-cyclic organic chain;
applying a photoresist layer superjacent to the adhesion promoter;
exposing the photoresist layer to an incident radiation, wherein the photoacid generator is to generate an acid in response to being exposed to the incident radiation during the exposure of the photoresist layer to dope an interface region between the photoactive adhesion promoter and the photoresist layer with the acid to enhance solubility of the photoresist layer;
removing the photoresist layer.
13. The process of claim 12 wherein applying the photoactive adhesion promoter comprises depositing trimethoxysilane superjacent the semiconductor wafer and wherein the photoactive adhesion promoter is applied to the semiconductor wafer in a solution of ethyl lactate.
14. The process of claim 13 further comprising baking the semiconductor wafer to bond the photoactive adhesion promoter to the semiconductor wafer and wherein the photoactive adhesion promoter bonds to the photoresist layer via a chemical catalyst group comprising nonafluorobutanesulfonate.