Electron beam lithography in thick negative tone chemically amplified resist: Controlling sidewall profile in deep trenches and channels
Exposure characteristics of 30keV e-beam lithography in thick SU-8 is reported. Evolution of sidewall profile of 3D structures with exposure dose is analyzed. Sidewall profiles of the structures are compared with electron energy deposition profiles. Sidewall profile variation indicates cross-linking in SU-8 proceeds via reactiondiffusion. Novel bilayer micro/nano-structure fabrication with e-beam is demonstrated.
electron beam lithography chemically amplified resist electron matter interaction