Method of manufacturing integrated circuit
View Patent ↗In order to shorten the period for the development and manufacture of a semiconductor integrated circuit device, at the time of transferring integrated circuit patterns onto a wafer by an exposure process, a photomask PM 1 is used which is provided partially with a light shielding patterns 3 a formed of a resist film, in addition to light shielding patterns formed of a metal.
1. A method of manufacturing a semiconductor integrated circuit device, comprising a step of transferring predetermined patterns onto a resist film formed on a main surface of a semiconductor wafer by an exposure process using a photomask, the photomask having on a main surface of a mask substrate both a light shielding portion formed of a resist film and a light shielding portion formed of a metal in an integrated circuit pattern region.
2. The method according to claim 1 , further comprising a step of removing the light shielding portion formed of the resist film and instead forming a new light shielding portion comprised of a resist film.
3. The method according to claim 1 , wherein a pattern for the transfer of a custom circuit pattern is formed of the light shielding portion of the resist film.
4. The method according to claim 1 , wherein a pattern for the transfer of an information write pattern in memory is formed of the light shielding portion comprised of the resist film.
5. The method according to claim 1 , wherein a pattern for the transfer of a characteristic adjusting pattern in an integrated circuit is formed of the light shielding portion comprised of the resist film.
6. The method according to claim 1 , wherein a pattern for the transfer of a redundant circuit constituting pattern is formed of the light shielding portion comprised of the resist film.
7. The method according to claim 1 , wherein a pattern for the transfer of a customer's information pattern is formed of the light shielding portion of the resist film.
8. The method according to claim 1 , wherein a light shielding portion is formed using a metal in a peripheral portion of the main surface of the mask substrate.
9. The method according to claim 8 , wherein a pellicle is provided on the main surface of the mask substrate so as to cover an integrated circuit pattern region, the pellicle being in contact and fixed onto the light shielding portion comprised of the metal.
10. The method according to claim 9 , wherein an information detecting pattern is formed by forming an opening in the light shielding portion formed of the metal.
11. The method according to claim 1 , wherein an exposed region of the mask substrate is formed in a peripheral portion of the main surface of the mask substrate.
12. The method according to claim 11 , wherein a pellicle is provided on the main surface of the mask substrate so as to cover the integrated circuit pattern region, the pellicle being in contact and fixed onto the exposed region of the mask substrate.
13. The method according to claim 12 , wherein an information detecting pattern is formed by providing a light shielding portion formed of a metal in the exposed area of the mask substrate.
14. The method according to claim 1 , wherein there is used exposure light having a wavelength of not shorter than 100 nm and shorter than 250 nm.
15. The method according to claim 1 , wherein a circuit pattern to be changed or modified for realizing a semiconductor chip construction conforming to a requested specification includes said light shielding portion formed of the resist film.