Selective dry etching of attenuated phase-shift mask materials for extreme ultraviolet lithography using inductively coupled plasmas
- Authors
- Jung, Helen Y.; Park, Ye Rim; Lee, Hack Joo; Lee, Nae-Eung; Jeong, Chan Young; Ahn, Jinho
- Issue Date
- Nov-2009
- Publisher
- A V S AMER INST PHYSICS
- Keywords
- alumina; molybdenum; multilayers; phase shifting masks; plasma materials processing; ruthenium; silicon; sputter etching; tantalum compounds; ultraviolet lithography
- Citation
- JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, v.27, no.6, pp.2361 - 2365
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
- Volume
- 27
- Number
- 6
- Start Page
- 2361
- End Page
- 2365
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/175925
- DOI
- 10.1116/1.3253532
- ISSN
- 1071-1023
- Abstract
- Among the core extreme ultraviolet lithography (EUVL) technologies, mask fabrication is of considerable importance due to the use of new reflective optics having a completely different configuration from that of conventional photolithography. This study investigated the etching properties of attenuated phase-shift mask materials for EUVL, such as TaN (attenuator layer), Al2O3 (spacer), Mo (phase shifting layer), Ru (buffer/capping/etch-stop layer), and Mo-Si multilayer (reflective layer) by varying the Cl-2/Ar gas flow ratio, dc self-bias voltage (V-dc), and etch time in inductively coupled plasmas. For the fabrication of the attenuated EUVL mask structure proposed herein, the TaN, Al2O3, and Mo layers need to be etched with no loss of the Ru layer on the Mo-Si multilayer. The TaN and Al2O3 layers were able to be etched in BCl3/Cl-2/Ar plasmas with a V-dc of -100 V and the Mo layer was etched with an infinitely high etch selectivity over the Ru etch-stop layer in a Cl-2/Ar plasma with a V-dc of -25 V even with increasing overetch time.
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