Lithographic mask and method for fabrication thereof
First Claim
1. In a method for making an electronic mask using a high voltage electron beam, which mask comprises a support medium, an absorber layer disposed above said support medium, and a resist layer disposed above said absorber layer, the improvement comprising the step of providing a dielectric layer between said absorber layer and said resist layer, said dielectric layer having the function of preventing at least some electrons from reentering said resist layer.
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Accused Products
Abstract
Improvement in resolution in terms of minimum feature sizes and proximity fects in an electronic mask is attained by making the mask using a high voltage electron beam which deflects or blocks backscattered electrons. The novel mask structure comprises a transparent support, an absorber layer disposed on said support, a dielectric layer disposed on said absorber layer, and a resist layer disposed on said dielectric layer. It is the dielectric layer which is credited for improving resolution in said mask which can be used a multiple number of times in printing a pattern for various applications, including electronic devices and integrated circuits.
66 Citations
8 Claims
- 1. In a method for making an electronic mask using a high voltage electron beam, which mask comprises a support medium, an absorber layer disposed above said support medium, and a resist layer disposed above said absorber layer, the improvement comprising the step of providing a dielectric layer between said absorber layer and said resist layer, said dielectric layer having the function of preventing at least some electrons from reentering said resist layer.
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6. In a method for making an electronic mask using an electron beam rated at about 10 to 100 kiloelectron volts, said mask comprising a support transparent to x-rays selected from silicon carbide, silicon nitride, biron nitride, diamond, silicon, and carbon;
- an absorber layer disposed on said support selected from tungsten and gold; and
a negative resist disposed on said absorber layer selected from chemically amplified novolac resists;
the improvement in the method for making said mask comprising the steps of providing a dielectric layer between said absorber layer and said resist layer about 1 to about 1000 nm thick, said dielectric layer having the function of reducing proximity effects in the pattern written with said electron beam on said resist. - View Dependent Claims (7, 8)
- an absorber layer disposed on said support selected from tungsten and gold; and
Specification