13 October 2011 Phase-shifting effect of thin-absorber EUV masks
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Abstract
Phase-shifting effect of EUV masks with various absorber thicknesses has been studied both by simulations and experiments. In EUV lithography, masks with 180 phase shifting absorber work like embedded attenuated phase-shifting masks. At 66nm thickness of TaN/TaON absorber, 180 degree phase shifting can be achieved in theory. Based on the experiments, we observed that the true180 degree phase shifting can be achieved with absorber thickness between 66 and 76 nm. In this paper, phase shifting impact of the various thickness absorbers has been characterized. Imaging performance of masks with 51 nm, 66 nm and 76 nm thick absorber has been experimentally compared. The process window of various thickness absorber masks are rigorously studied.
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Hiroyoshi Tanabe, Hiroyoshi Tanabe, Tetsunori Murachi, Tetsunori Murachi, Sang H. Lee, Sang H. Lee, Manish Chandhok, Manish Chandhok, Seh-Jin Park, Seh-Jin Park, Guojing Zhang, Guojing Zhang, Tsukasa Abe, Tsukasa Abe, Taichi Ogase, Taichi Ogase, Naoya Hayashi, Naoya Hayashi, "Phase-shifting effect of thin-absorber EUV masks", Proc. SPIE 8166, Photomask Technology 2011, 816618 (13 October 2011); doi: 10.1117/12.895149; https://doi.org/10.1117/12.895149
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