Presentation is loading. Please wait.

Presentation is loading. Please wait.

Development of Scanning Probe Lithography (SPL)

Similar presentations


Presentation on theme: "Development of Scanning Probe Lithography (SPL)"— Presentation transcript:

1 Development of Scanning Probe Lithography (SPL)
1) “Device fabrication by scanned probe oxidation”, Science, 1995 2) “Nanofabrication by scanning probe microscope lithography: A review”, J. Vac. Sci. Tech., 2005 3) “Scanning Probe Parallel Nanolithography with Multiprobe Cantilever Array Fabricated by Bulk Silicon Micromachining”, IEEJ, 2008 EE C235/NSE C203 Nanofbrication Jun Suk Rho

2 Scanning Probe Lithography
Bottom Up Technique - Chemical and molecular patterning (DPN) Top down Technique - Mechanical Patterning Scratching Nano Indentation - Voltage bias application Field Enhanced Oxidation Electron exposure of resist materials Substitution Technique - Manipulation of nanostructures Mar. 9th. 2009 Rho, Jun Suk

3 Achievements Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk

4 Scanning Probe Lithography (SPL) Atomic Force Microscopy (AFM)
Scanning Tunneling Microscopy (STM) Scanning Probe Parallel Lithography (SPL Array) Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk

5 Scanning Probe Lithography (SPL)
Began at NIST in 1989 Typical line width: below 50nm Scan rate: 10~20um/s Creating patterns with high resolution but are limited in throughput J. A. Dagata, Vol. 270, pp , Science, 1995 Mar. 9th. 2009 Rho, Jun Suk

6 AFM Lithography Scratching
The advantages of nanoscratching for lithography - The absence of additional processing steps (i.e etching) Dec. 10th. 2008 Mar. 9th. 2009 Rho, Jun Suk

7 Electric Field Enhanced Oxidation
Voltage bias between a sharp probe tip and sample generates an intense electric field at the tip Oxidization of silicon & Anodization of metals The high field desorbs the hydrogen on the silicon surface and enables exposed silicon to oxidize Oxidation depends on humidity Can achieve sub-50nm feature sizes J. A. Dagata, Vol. 270, pp , Science, 1995 Dec. 10th. 2008 Mar. 9th. 2009 Rho, Jun Suk

8 Scanned Probe Oxidation- Applications
Fabrication of single tunneling transistor(SET) Fabrication of Si nanowire J. A. Dagata, Vol. 270, pp , Science, 1995 Mar. 9th. 2009 Rho, Jun Suk

9 Electric Field Enhanced Oxidation
AFM anodic Oxidation (Left) AFM Nanolithography (Below) Dec. 10th. 2008 Mar. 9th. 2009 Rho, Jun Suk

10 Parallel Field Enhanced Oxidation
Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk

11 Profile vs. Resist by AFM Lithography
M. Rolandi et al. NANO LETTERS Vol. 4, No Mar. 9th. 2009 Rho, Jun Suk

12 Non Contact AFM Lithography
Silicon probe tip acts as a source of electrons The field emission current from the tip is used as the feedback signal to control the tip sample spacing Dec. 10th. 2008 Mar. 9th. 2009 Rho, Jun Suk

13 Pros & Cons of SPL (AFM Lithography)
Making nano patterns without optical apparatus Making arbitrary patterns by controlling AFM tips Good linearity allowing excellent line width control No backscattering which exists in EBL No proximity which exists in EBL Cons Low throughput: serial scan and low speed Small scan area Requires higher incident electron dose than EBL Mar. 9th. 2009 Rho, Jun Suk

14 Scanning Probe Lithography (SPL) Atomic Force Microscopy (AFM)
Scanning Tunneling Microscopy (STM) Scanning Probe Parallel Lithography (SPL Array) Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk

15 1D tunneling Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk

16 STM Lithography Application of voltage pulse between tip and sample
“Pushing” atoms Advantages of STM Litho Information storage devices Nanometer patterning atoms M. Crommie (UC Berkley), Vol. 262, Science, 1993 Dec. 10th. 2008 Mar. 9th. 2009 Rho, Jun Suk

17 Scanning Probe Lithography (SPL) Atomic Force Microscopy (AFM)
Scanning Tunneling Microscopy (STM) Scanning Probe Parallel Lithography (SPL Array) Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk

18 Scanning Probe Arrays Lithography
Hensy Gandjar, Yuki Takagi, Naoki Matsuzuka, Yoshitada Isono, IEEJ, 2008 Mar. 9th. 2009 Rho, Jun Suk

19 Scanning Probe Arrays Lithography
Hensy Gandjar, Yuki Takagi, Naoki Matsuzuka, Yoshitada Isono, IEEJ, 2008 Mar. 9th. 2009 Rho, Jun Suk

20 Comparison Strength Weakness All SPL Nanoscale Resolution
Accurate alignment Real-time imaging Array operation Low throughput in serial Lack of controlling array STM Higher resolution (atomic) Minimum proximity effect Precise control Vacuum control Limited resist thickness Limited pattern uniformity Conducting substrate required Very low processing speed AFM Good reproducibility Wide range of materials Compatible with self assembly Debris formation in scratching Low tip life time in scratching Array synchronization(DPN) Mar. 9th. 2009 Rho, Jun Suk

21 Conclusion Although Several basic issues are still unresolved
with respect to these techniques, (i.e. the details of The mechanism of ink transport in DPN are still unclear), it is very promising and developing technique. Polymer Pen Lithography SPL with NSOM SPL with SECM Self Assembly Monolayer (SAM) ETC On-wire Lithography Dec. 10th. 2008 Mar. 9th. 2009 Rho, Jun Suk

22 Thank You ! Mar. 9th. 2009 Dec. 10th. 2008 Rho, Jun Suk


Download ppt "Development of Scanning Probe Lithography (SPL)"

Similar presentations


Ads by Google