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Nanoparticle Inks for Printed Electronics

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					   NanoMas Technologies, Inc


   Nanoparticle Inks
for Printed Electronics

             Zhihao Yang
           President & CTO
     NanoMas Technologies, Inc.
   zhihao.yang@nanomastech.com
 Technology Revolutions in Electronics
        for the Past 100 Years
• Vacuum Tube Transistors: 1906
  by Lee De Forest

• Solid State Transistors: 1947 by
  John Bardeen and Walter
  Brattain (Bell Telephone
  Laboratories)

• Integrated Circuits: 1958 by Jack
  Kilby (Texas Instruments)
                  What Next?
The industry has followed the prediction of Moore’s Law
for the last 40 years without major technology revolution.
Moore’s Law: The number of transistors per unit area is
doubling every 1.5 years. --Gordon Moore (founder of
Intel Corporation).
Moore’s Law is reaching its physical limit in next 5 to 10
years.
What will be the next technology revolution in the
electronics industry?


Look beyond the Silicon
      Low-Cost ICs on Arbitrary Substrates
                                                             Polymeric substrate AMLCD
                                a-Si:H strain bridge array




                                                                    a-Si:H active matrix
Pentacene organic circuits on          Plastic solar cell          Gamma ray detector on
polymeric or cloth substrates                                       polyimide substrate
                 Large Area & Flexible Displays
Flexible active matrix e-paper
SVGA display (Plastic Logic)     World's thinnest flexible active-
                                 matrix display (Philips)




                                            The plastic TFT-LCD
                                            display (Samsung)



                                          World's first 3mm thick
                                          flexible digital watch
                                          (Citizen)
Low-cost RFIDs and Disposable Electronics




 Current cost: 7-10 cents per tag
 Target cost: 1-2 cents per tag
Printed Electronics Manufacturing
Tremendous Market Growth Potential for
  Printed Electronics in Next 20 Years
                                               2011 Total PE Reveue $12,385 (in Million)

                                           (Data from NanoMarkets LLC)
                       $14,000.0
                                          (Data from NanoMarkets LLC)
                       $12,000.0
                                     Other (21% Overall),
                                            $2,601
                       $10,000.0                                                    Printable Display,
                                                                                          $3,801
        $ in Million




                        $8,000.0

                        $6,000.0
                                  Printable
                             Photovoltaic, $1,042
                        $4,000.0

                        $2,000.0
                               Printable Backplanes,
                                      $1,134
                            $0.0
                                                                              RFID, $2,557
                                            Printable Signage,
                                         2006            2007       2008          2009            2010   2011
                                                    $1,250
                                                                           Year




Recent report by IDTechEx predicts the PE market will reach $300B in 2027
                     Printed Conductors
Highly conductive and high resolution patterns fabricated using low-cost and
roll-to-roll processes (such as inkjet and gravure printing) are one of the most
critical technology components in making printed electronics and displays




              NanoMas Solutions:
              Make conducting patterns using
              metal nanoparticle inks!

Market of Applications:
 Flat panel display backplanes (TFT electrodes and bus-bars)
 EMI Shielding : plasma display, LCD, etc
 RFID tags
 Electroluminescent lighting
 Printed circuit boards (PCBs)
 Touch screens
Technology Comparison for Printed Conductors

   Vacuum Processed
                                               Evaporated Metals

                     Sputtered ITO


    Printable                     Metal Nanoparticle Inks

                       Silver Micro-Powder Pastes
                Carbon
                Nanotubes

        Conductive
        Polymers

  Resistivity     10      100     10-1   10-2       10-3   10-4    10-5   10-6 (Ohm-cm)

  Conductivity 10-1 100           10     102        103    104     105    106   (S/cm)
     Size-Dependent Melting Point of Nanoparticles

                                       Tb − Tm      2            ρs  3 
                                                                        2

                                               =           γs −γl   
                                         Tm      L ρ s Rs         ρl  
                                                                          




Small particle size (in nanometers)
significantly reduces the melting
temperature of NPs from the bulk
melting point, allowing for very low
processing temperatures (based on
surface melting) for sintering NPs
into conducting films.


    Ph. Buffat and J-P. Borel, Phys.
    Rev. A, 13, 1976, 2287
  Nanoparticle Inks for Printed Electronics
• Nanoparticles can be stabilized in ink solutions by organic ligand
  shells, which can be removed after printing.
• Nanoparticles can be further cured or sintered to highly conductive
  films at low temperatures.


                        70-90°C             100-150°C




 Deposited Ag nanoparticles
                                           Conductive Ag film on PET cured
                                           from printed nanoparticle inks


                                  150°C



                       200 nm
NanoMas Proprietary Technology: Producing High Quality
Nanoparticles with Large-Scale and Low-Cost Processes


                                                           NanoMas
                                                           silver
                                                           nanoparticles
                                                           with 5-6 nm
                                                           in size (SEM)




A 50L pilot production
reactor at NanoMas       NanoMas Ag nanoparticle powders and inks
   NanoMas Proprietary Printable Metal
 Nanoparticle Conductive Inks Technology
• Unique all solution based nanoparticle synthesis technology
  (patent pending), widely compatible with the low cost
  production processes in the chemical industry
• Low cost and fully scalable to large scale mass production
   – Scaled up to pilot production with a 50 litter reactor
• Ultra-small nanoparticle size (2 to 10 nm) with specially
  designed surface chemistry allows low annealing
  temperature, short process time, and high conductivity
• Variety of surface chemistry for different solvent dispersion
  and applications
• Low resistivity (as low as ~2.3 µ -cm, 1.5x of pure Ag)
• Low process temperature (as low as ~90°C) compatible with
  most plastic substrates
• Also curable by laser or UV light at room temperature
       UV-vis Characterization of NanoMas
         Gold and Silver Nanoparticles

                                               Ag nanoparticles in cyclohexane
                                               (λmaxNano-Ag
                                                    ~ 416 nm)



                                                        Au nanoparticles in
                                                        cyclohexane
                                                          Nano-Au




Nano-Au (4 nm)   Nano-Ag (5 nm)
 nanoparticle     nanoparticle
  solution in      solution in
                                  UV-Vis Absorption Spectra of Au and Ag
 cyclohexane      cyclohexane
                                          Nanoparticle Solutions
    NanoMas Au Nanoparticles (<5 nm)
               DSC                                      TEM




• DSC: exothermic sintering between 180ºC and 210ºC

• TGA: ~10-15% weight loss between 180ºC and 250ºC due to loss of
surface capping agent

• Resistivity: ~8 µ -cm (annealed at 200°C, 3x of bulk Au)
              NanoMas Ag Nanoparticles
             DSC                                                       TEM




            sintering


                                                             ECD Distribution of ZHY-050616 by TEM

                                                 0.30

                                                 0.25                               Metric           Value
                                                                                    Mean ECD [nm]          5.72
                                                 0.20                               Std Dev ECD [nm]       1.79
                                                                                    Count                   726

                                     Frequency
• DSC: exothermic sintering                      0.15
                                                                                    GMD ECD [nm]           5.43
                                                                                    GSD                    1.41
between 110ºC and 160ºC                          0.10
                                                                                    Fit GMD [nm]           5.98
• TGA: ~10% weight loss between                  0.05                               Fit GSD [nm]           1.24

100ºC and 200ºC due to loss of                   0.00

surface capping agent                            -0.05
                                                         1                        10                          100
• Resistivity: 2.4 µ -cm (annealed                                             ECD [nm]

at 150°C, 1.5x of bulk Ag)                                         Frequency size: 6 ±1 nm
                                                                  ParticleData Lognormal Fit
                              Small Angle Neutron Scattering (SANS)
                              Characterization of NanoMas Nano-Ag
             SANS of Packed Nano-Ag (Solid)                                                  SANS on Nano-Ag Solutions
                                                                              1.0              (10 wt% in d-Toluene)
                                                                                                                    SANS Data
                                                                                                                    Core-Shell Model Fitting
                                                                              0.5
                                                                                     Scattered neutron




                                                            Intensity (cm )
                                                           -1
                                                                              0.0
                                          Incident neutron
                                                                              -0.5
                                                                                         Core radius: 23 ± 1 Ǻ
                                                                                         Core radius: 23 ± 1 Ǻ
                  5
                                                                                                            θ
                                                                                         Core radius σ: 5.5 Ǻ
                                                                                         Core radius σ: 5.5 Ǻ
                                                           sample
                                                                -1.0                     Shell thickness: 6 ±1 Ǻ
                                                                                         Shell thickness: 6 ±1 Ǻ

                  4
                                         Qmax= 0.120 Ǻ-1                        -2.0                 -1.5                  -1.0                -0.5
                                                                                                         Log (Q) [A]
Intensity (cm )
-1




                  3
                                                                                                                detector
                  2
                                                                                 SANS spectra confirmed that the Nano-Ag
                  1
                                                                                 has an Ag core diameter of 4.6 ±1.1 nm and a
                      interparticle distance ~ 5.2 nm                            0.6 ±0.1 nm thick shell in solvent or a 0.3 nm
                  0
                       0.05    0.10      0.15    0.20      0.25                  shell in packed (solid) state.
                                      Q (A)
Superior Performance of NanoMas NanoSilver Inks
     due to the Ultra-Small Nanoparticle Size
                                                             PET          Kapton
                         25
                              ManoMas (~ 5 nm)                     Cabot PED (20-30 nm)

                                                              NanoAg (~25 nm)
                         20                                   from competitors
  Resistivity ( µΩ-cm)




                         15
                                             NanoMas
                                             NanoAg (5 nm)

                         10



                         5

                                Ag bulk resistivity

                         0
                          NovaCentrix
                                   100              150           200
                                                            Cima NanoTech          250
                          (~20 nm broad distribution)
                                          Annealing       Temperature (C)
                                                            (80-100 nm)
Printed Conductive Patterns on Plastic Substrates




              13.56 MHz RFID antenna printed on PET and polyimide




 Miniature RF coil printed on PET      Printed flex circuit on polyimide
        Inkjet Printed NanoSilver Contacts in
          Fabricating a-Si:H TFTs on Glass
                                         Probes

                                                                   Source
                                                                    Drain



             Ag (~ 30 nm)
             Cr (~ 5 nm)
                                                                  VDS = 40 V
             n+ a-Si:H (~ 50 nm)                                                                  200
                                                             -4         L = 110 um
             a-Si:H (~ 200 nm)                              10
                                                                        L = 140 um
             a-SiNx:H (~ 300 nm)
             Cr (~ 35 nm)




                                                                                                        IDS (uA)
             Glass Substrate                      IDS (A)    -5
                                                            10                                    100

 L (µm)               110          140                       -6
                                                            10                                    0
 µ   (cm2/Vs)      ~ 0.91       ~ 0.97
 VT (V)            ~ 1.68       ~ 1.41                            -10   0    10    20   30   40
                                                                             VGS (V)
* Data curtsey of Dr. Yongtaek Hong of
Seoul National University, Korea
             Printed NanoSilver Contacts in
                Fabricating Organic TFTs
           Ag         PQT          Ag
       Silicon dioxide gate dielectric
         Single crystal silicon gate




• Organic Semiconductor: poly(3,3 -
didodecyl-quaterthiophene) or PQT-12
• Source and drain printed with NanoMas
NanoSilver inks and annealed at 145ºC
• Device channel length of ~43 um and
width of ~300 um
• No obvious contact resistance

 * Data curtsey of Dr. Jurgen Daniel of PARC
     Inkjet Printed TFTs with ZnO and Ag
               Nanoparticle Inks

                     • Print or coat with ZnO nanoparticle ink
                     • Heat step at 200 C to anneal
                     • Print silver nanoparticles for source/drain,
                     and annealed at 150C

                               ZnO TFT with printed Ag contacts
                                        1.0E-04                              8.0E-03
                                        1.0E-05
                                                                             6.0E-03
                              Log(Id)   1.0E-06
                                        1.0E-07                              4.0E-03
                                        1.0E-08
                                                                             2.0E-03
                                        1.0E-09
                                        1.0E-10                              0.0E+00
                                                  -30   -10   10   30   50
                                                              Vg
Mobilities: 0.1-0.15 cm2/Vs
On/Off: ~105
                    About Cost…
• What Printed Electronics should shoot for are high
  productivity, large size and volume, high flexibility, and
  ultimately the LOW COST.
• The nanoparticle inks should also be made by LOW COST
  processes.
• NanoMas makes sure all the nano-materials it makes can
  be mass produced with LOW COST processes.




       Lab              Pilot Production    Mass Production
NanoMas Technology and Product Roadmap
• NanoMas current products include NanoSilver™ and NanoGold™
  conductive inks.
• Under development with its proprietary technology, NanoMas will also
  provide inorganic nanoparticle and polymer semiconductor inks, as well
  as electroluminescent (EL or LED) inks for PE applications.
• NanoMas also has the technologies to mass produce high quality carbon
  nanotubes and carbon nanofibers.
                   NanoMas Product Portfolio
Printable Electronics & Displays        Functional Nanomaterials
    • Silver nanoparticle inks             • Silver nanoparticles
    • Gold nanoparticle inks               • Gold nanoparticles
    • EL nanoparticle inks                 • Carbon nanotubes
    • Semiconductor nanoparticle inks      • Carbon nanofibers
    • Polymer semiconductor inks           • Decorated carbon nanotubes
    • Inorganic dielectric inks            • Magnetic nanoparticles
    • Polymer dielectric inks              • Novel catalysts for making
                                           carbon nanomaterials
Other Nanomaterials Developed at
   NanoMas Technologies, Inc.
               NanoMas Technologies, Inc

NanoMas Technologies, Inc. is an early stage start-up company,
located in the Innovative Technologies Complex (ITC) on the campus of
Binghamton University (SUNY) in Binghamton, New York, where is also
the home of Center for Advanced Microelectronics Manufacturing
(CAMM), funded by the USDC to lead the development of next
generation roll-to-roll (R2R) microelectronics manufacturing.

                                   Innovative Technologies Complex
                                   Suite 2109
                                   85 Murray Hill Road
                                   Vestal, NY 13850

                                   Phone: 607-821-4208
                                   Fax: 866-367-1128 (toll-free)
                                   Website: www.nanomastech.com

				
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posted:2/24/2012
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