Patent Number: 
Section: claims

1. A method of manufacturing an integrated circuit (IC) device, the method comprising:forming a photoresist layer on a substrate; andexposing the photoresist layer to light by using a photolithographic apparatus including a light generator,wherein the light generator includes:a chamber having a plasma generation space,an optical collector in the chamber, the optical collector having an aperture, anda debris shielding assembly between the optical collector and the plasma generation space in the chamber,wherein the debris shielding assembly includes:a protective film facing the optical collector and being spaced apart from the optical collector with a protected space therebetween, the protected space including an optical path, the protective film having a through hole in a center region of the protective film, and the through hole being spaced apart from the aperture with the protected space therebetween, anda protective frame attaching the protective film to the optical collector, the protective frame to support the protective film and to shield the protected space from the plasma generation space. 2. The method as claimed in claim 1, wherein the protective film includes a material that is transparent with respect to a laser beam having a wavelength of about 1064 nm, a laser beam having a wavelength of about 10.6 μm, and extreme ultraviolet (EUV) light having a wavelength of about 13.5 nm. 3. The method as claimed in claim 1, wherein the protective film includes carbon nanotube, diamond, graphite, graphene, fullerene, or a combination thereof. 4. The method as claimed in claim 1, wherein the protective film includes a carbon nanotube film having single-wall carbon nanotubes (SWCNT), multiwall carbon nanotubes (MWCNT), or a combination thereof. 5. The method as claimed in claim 1, wherein the protective frame includes a metal. 6. The method as claimed in claim 1, wherein the protective frame includes:a support portion in contact with an edge portion of the optical collector; anda shield portion integrally connected with the support portion, the shield portion extending between the support portion and the protected film to shield the protective space from the plasma generation space. 7. The method as claimed in claim 1, wherein the protective frame includes:a support portion in contact to an edge portion of the optical collector;a shield portion extending between the support portion and the protective film to shield the protected space from the plasma generation space; andan outer fixing portion facing the shield portion with the protective film therebetween and supporting the protective film in cooperation with the shield portion. 8. The method as claimed in claim 7, wherein the protective frame further includes at least one of a first buffer film that is between the shield portion and the protective film, and a second buffer film that is between the protective film and the outer fixing portion. 9. The method as claimed in claim 7, wherein the shield portion includes an elliptic surface facing the protected space. 10. The method as claimed in claim 7, wherein the shield portion includes a reflective surface facing the protected space, and the reflective surface is an elliptic surface. 11. A method of manufacturing an integrated circuit (IC) device, the method comprising:forming a photoresist layer on a substrate; andexposing the photoresist layer to light by using a photolithographic apparatus including a light generator,wherein the light generator includes:a chamber having a plasma generation space,an optical collector in the chamber, the optical collector having an aperture and a reflective surface, anda debris shielding assembly between the optical collector and the plasma generation space in the chamber,wherein the debris shielding assembly includes:a protective film spaced apart from the reflective surface with a protected space therebetween and facing the reflective surface, the protected space including an optical path, the protective film having a through hole at a position corresponding to the optical path in the protective film, and the through hole being spaced apart from the aperture with the protected space therebetween, anda protective frame that is in contact with an edge portion of the optical collector and supports the protective film. 12. The method as claimed in claim 11, wherein the protective frame includes:a support portion in contact with the edge portion of the optical collector;a shield portion integrally connected with the support portion and having an inner surface between the support portion and the protective film, the inner surface facing the protected space; andan outer fixing portion facing the shield portion with the protective film therebetween and supporting the protective film in cooperation with the shield portion. 13. The method as claimed in claim 12, wherein the support portion includes a ring member extending from the shield portion, the ring member having a straight cross-sectional shape or an L-like cross-sectional shape. 14. The method as claimed in claim 12, wherein the shield portion includes a shield frame and a reflective layer on the shield frame, the reflective layer being exposed to the protected space, and the reflective layer defining an elliptic surface together with the reflective surface of the optical collector. 15. The method as claimed in claim 11, wherein the protective frame has widths varying in a circumferential direction with respect to a central axis of the debris shielding assembly. 16. The method as claimed in claim 11, wherein the debris shielding assembly further includes a fixing member that couples the protective film and the protective frame. 17. A method of manufacturing an integrated circuit (IC) device, the method comprising:forming a photoresist layer on a substrate; andexposing the photoresist layer to light by using a photolithographic apparatus including a light generator,wherein the light generator includes:a chamber having a plasma generation space;an optical collector in the chamber, the optical collector having an aperture and a reflective surface; anda debris shielding assembly between the optical collector and the plasma generation space in the chamber,wherein the debris shielding assembly includes:a protective film facing the reflective surface with a protected space therebetween, the protected space including an optical path, the protective film having a through hole at a position corresponding to the optical path in the protective film, and the through hole being spaced apart from the aperture with the protected space therebetween, anda protective frame attaching the protective film to an edge of the optical collector, the protective frame extending along an entire perimeter of the edge of the optical collector. 18. The method as claimed in claim 17, wherein exposing the photoresist layer includes using EUV light generated in the light generator.