anamorphic high na optics enabling euv lithography with...
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Anamorphic High NA Optics enabling EUV Lithography with sub 8nm Resolution
October 7th, 2015 · Maastricht, Netherlands
Tilmann Heil, Bernhard Kneer, Sascha Migura, Johannes Ruoff, Matthias Rösch, Jens Timo Neumann, Winfried Kaiser (ZEISS); Jan van Schoot (ASML). 2015 International Symposium of Extreme Ultra Violet Lithography
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2 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
This talk is about resolution
NA Resolution = k1
λ ·
NA 0.33 … 0.4 … 0.5 … 0.6
Resolution @ k1=0.3 single exposure / nm 12.3 … 10.1 … 8.1 … 6.8
How does a High-NA EUV Optics look like? How does it image? Can we further optimize system performance?
EUV 13.5nm
High-NA
NA > 0.5 enables
(sub) 8nm
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3 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Structure of presentation
1
2
3
Anamorphic Imaging
Optical Solutions for High NA EUV Lithography
Lens Magnification Options
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4 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
The EUV Optical System: The finer the resolution, the larger the angles!
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5 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Higher NA increases the light cone above the wafer, and…
M5
M6 M6
M5
Medium NA High-NA
NA
NA
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6 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
…increases the angles on M5, and…
M5
M6 M6
M5
Medium NA High-NA
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7 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
…increases the angular spread on M5.
M5
M6 M6
M5
Medium NA High-NA
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8 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Multi-layer coatings set limits for angles & angular spread on EUV mirrors.
Standard EUV coatings are not able to reflect the combination of large angles and large angular spreads on M5 needed for high-NA.
Angles must be reduced for high-NA EUV optics.
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9 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
There is a solution: Obscuration – We drill a hole into the mirror.
M5
M6 M6
M5
The obscuration massively reduces angles & angular spread on the mirrors…
…which significantly increases the transmission of the optical
system vs. 3300!
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10 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
The EUV Optical System
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11 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Fields and light cones at reticle and wafer are connected via MAG.
@ wafer @ reticle
y
z
NA
2 x CRAO (Chief Ray Angle @ Object)
0.0825 = 0.33
4x Example NXE:3300
Projection with MAG 4x
CRAO 6° NA 0.33
104 mm
132
mm
x
y
26 mm
33 m
m
slit
NA @ reticle = NA
MAG
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12 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Increasing NA, light cones @ reticle start to overlap.
@ reticle
104 mm
132
mm
26 mm
33 m
m
y
z @ wafer
Projection with MAG 4x
CRAO 6° NA 0.5
x
y
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13 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
High-NA EUV – Conventional approaches fail
MAG 4x, CRAO 9°
FF
@ wafer @ reticle
MAG 8x, CRAO 6°
QF
Shadowing Bad imaging
MAG 8x, CRAO 6°
FF
small field Bad Tput
No large mask
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14 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Maybe looking at movies helps…
Cinema Widescreen Reality
Record with a conventional
lens
Project with a conventional
lens
Same aspect ratio, same angles. BUT: Bad usage of space, Lower resolution
Film
Image by Bernd Geh
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15 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
…where anamorphic cinematographic lenses are used…
Cinema Widescreen Reality
Project with an Anamorphic
lens
Anamorphic MAG vertically „stretches“ image for good usage of space, lower angles , better resolution
Film
Record with an Anamorphic
lens*
*e.g. a ZEISS Master Anamorphic Lens
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16 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
…to reduce angles at the mask and increase resolution in lithography.
Cinema Widescreen Reality
Wafer Image Electronics Design Mask
„Anamorphic“ Mask writing
Anamorphic Projection
Same image on wafer, but much lower angles in stretching direction!
Film
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17 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
The solution: Reducing the angles by increasing MAG only in the direction that matters...
104 mm
132
mm
y
z
x
y
@ wafer @ reticle
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18 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
MAG 4x in x MAG 8x in y
104 mm
132
mm
y
z
26 mm
16.5
mm
QF CRAO 6° NA >0.5
x
y
Anamorphic Projection, e.g. with
…enables a High-NA EUVL optical system with a 26mm slit and Half-Field.
@ wafer @ reticle
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19 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
The Anamorphic High-NA EUV Projection Optics with obscuration…
Design examples
Wafer level
Reticle level
NA 0.25 NA 0.33 NA > 0.5
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20 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
…is a big optical system using large mirrors with extreme aspheres and accuracy requirements.
Extreme aspheres enabling further improved wavefront /imaging performance
Big last mirror driven by High NA
Large overall size of optical system
Tight surface specifications enabling low straylight / high contrast imaging
Challenge to optics technology and manufacturing, but no fundamental limits
Obscuration enables significantly higher optics transmission vs. 3300 Optimized Productivity
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21 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Structure of presentation
1
2
3
Anamorphic Imaging
Anamorphic High-NA EUV Optics enables sub 8nm resolution EUVL with 26mm slit @wafer and 6’’ mask
Lens Magnification Options
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22 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Compare given NA=0.33 Isomorphic imaging vs. Anamorphic High-NA with obscuration
Isomorphic, Unobscured, NA=0.33
Anamorphic, Obscured, NA > 0.5
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23 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Obscuration may lead to an application dependent contrast loss…
unobscured pupil
obscured pupil
this part lacks its corresponding 1st
order
red colored parts of 0th order can
interfere with corresponding
1st order
0th diffraction order
±1st diffraction orders
obscuration blocks parts
of 1st diffraction
orders
contrast loss
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24 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
...which can be tolerated if kept below ~20% radius.
Generic Lines & Spaces through pitch simulation
unobscured pupil
obscured pupil
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25 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Focus [nm] -50 0 -50 -25 25
NA=0.55, 12 nm spaces 4x/8x Anamorphic, 20% obscuration
H V
1.0
1.8
I 0 [a.
u.]
1.4
1.6
1.2 H-V, through pitch,
small annular
Excellent Imaging Scaling with NA – Obscuration and Anamorphicity have no visible impact on process window
Focus [nm] -75 -150 0 -150 75 1.0
1.8
I 0 [a.
u.]
NA=0.33, 20 nm spaces
1.4
1.6
1.2
H V
Focus axis scales according to familiar 1/NA² behaviour. Good Imaging scaling with NA No obscuration effects, no orientation dependence (H-V) due to Anamorphicity
H-V, through pitch, Small annular
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26 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Structure of presentation
1
2
3
The considered High-NA concept shows excellent imaging in line with the expected NA scaling
Anamorphic High-NA Optics enables sub 8nm resolution EUVL with 26mm slit @wafer and 6’’ mask
Lens Magnification Options
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27 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
The Optics can be designed in various ways to fit the (26 x 16.5)mm wafer field on the (132 x 132)mm reticle
(132 x 132) mm reticle field
Quality area with 14mm process radius
(104 x 132) mm reticle field
(26x16.5) mm wafer field
(132 x 104) mm reticle field
(26x16.5) mm wafer field
(123.8 x 123.8) mm reticle field
(26x16.5) mm wafer field
Mag: 5.1x/6.3x
Mag: 4.8x/7.5x
Mag: 4x/8x
NXE:33xy reticle field
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28 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
(132 x 132) mm reticle field
Quality area with 14mm process radius
(104 x 132) mm reticle field
(26x16.5) mm wafer field
(132 x 104) mm reticle field
(26x16.5) mm wafer field
(123.8 x 123.8) mm reticle field
(26x16.5) mm wafer field
Mag: 5.1x/6.3x
Mag: 4.8x/7.5x
Mag: 4x/8x
NXE:33xy reticle field
Shadowing
The Optics can be designed in various ways to fit the (26 x 16.5)mm wafer field on the (132 x 132)mm reticle
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29 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
First evaluation of Anamorphicity Options via MEF*
MEF* measures directly the impact of mask errors on wafer errors.
No normalization with MAG. Hence, MEF* is different for H- and V- structures in Anamorphic Lithography
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30 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
12nm spaces through pitch, small annular setting
A MAG of 4.8x/7.5x improves the critical Mask Error Sensitivity MEF* by ~20% for vertical structures…
Highest MEF* is driving mask requirements
~20% improvement
MEF
* [n
m]
MEF
* [n
m]
MEF* of Horizontal structures remains uncritical
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31 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
12nm spaces, Horizontal & Vertical, through pitch, small annular setting
…while imaging and process windows using 4x/8x and 4.8x/7.5x optical systems are very similar.
Both MAG options are comparable in terms of optical design complexity, optics technology and manufacturing.
12nm spaces H-V, through pitch, small annular
12nm spaces H-V, through pitch, small annular
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32 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Structure of presentation
1
2
3
The considered High-NA concept shows excellent imaging in line with the expected NA scaling
Anamorphic High-NA Optics enables sub 8nm resolution EUVL with 26mm slit @wafer and 6’’ mask
Further optimization of MAG Ratio is being studied – 4.8x/7.5x seems favorable from mask point of view.
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33 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
In conclusion…
• Anamorphic Lithography with Half Field is making High-NA EUVL economically feasible with NA >0.5 and utilizing the existing 6‘‘ mask infrastructure.
• Simulations based on the considered High-NA concept show excellent imaging performance in line with the expected NA scaling.
• An optimization of the optics MAG ratio is under investigation and may lead to a further improved overall system performance.
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34 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015
Acknowledgements
Bundesministerium für Bildung und Forschung - For funding of the projects 13N8088, 13N8837, 13N9112 and
13N10567 in the framework of the MEDEA+ / CATRENE programs
EUV Teams at ZEISS & ASML and our partners
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35 Carl Zeiss SMT GmbH, Tilmann Heil et al. 2015 EUVL Symposium Maastricht October 7th, 2015