The document discusses moiré patterns that can form in graphene-hexagonal boron nitride devices. It notes that atomic force microscopy is commonly used to characterize these patterns due to the insulating nature of hexagonal boron nitride. The document then introduces Park Systems' SmartScan Auto Mode for atomic force microscopy, which aims to minimize user input needed for parameter optimization and preserves tip sharpness for non-contact imaging of moiré patterns in these devices.

1. www.parkafm.com
Imaging Moiré Pattern using
SmartScan™ Auto Mode
Park Systems, Inc.
2015
Confidential and Proprietary, Park Systems, Inc.

2. What is a Moiré pattern?
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3. Potential Applications of graphene

4. Higher mobility needs appropriate substrate… .
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5. Production methods of Graphene/hBN devices .
- Low yield
- Random
Orientation of
graphene
- Unreliability in
electrical
properties
Direct transfer
- Essentially same
as graphene
growth method
- Complexity in
transfer process
Metal catalytic
CVD
- Graphene growth
on hexagonal BN
- Graphene
nucleation at
substrates defects
CVD without
metal catalyst

6. Graphene lattice constant: ~ 2.46 A
Lattice mismatch of ~1.8%
hBN lattice constant: ~ 2.50 A
Moiré pattern in graphene-hBN devices .
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7. Moiré pattern in graphene-hBN devices .
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8. Characterization of moiré pattern with AFM
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 AFM vs. STM: Insulating hBN substrate requires a non-conducting
technique.
 Tip sharpness: High cost for super sharp tips is hindering the research
projects.
 Parameter optimization: Another hindrance in most of research projects is
users learning curve for AFM imaging.

9. Imaging with Park SmartScan™ Auto Mode
 Standard PPP-NCHR tips are used.
 Auto mode minimizes required interaction of user for optimizing the
parameters.
 Non-contact mode preserves tip sharpness throughout the imaging.
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10. Park Systems
is a leading manufacturer of atomic force microscopy (AFM) systems
with a complete range of products for researchers and industry
engineers in materials science, chemistry, physics, life sciences,
semiconductor and data storage industries. Park’s products are used by
over a thousand of institutions worldwide. Park’s AFM features unique
patented set of technologies that yields highest data accuracy at
nanoscale resolution, superior productivity and ease of use, and lowest
operating cost to its customers. Park Systems, Inc. is headquartered in
Santa Clara, California with its global manufacturing, and R&D
headquarters in Korea. Park’s products are sold and supported
worldwide with regional headquarters in the US, Korea, Japan, and
Singapore, and distribution partners throughout Europe, Asia, and
America.
Please visit www.parkafm.com or call 408-986-1110 for more
information.
ABOUT US
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11. Thank you.
For more information, please contact:
Park Systems, Inc.
T: 408-986-1110
E: ardavan@parkafm.com
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