Transparent Electrode Applications
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2 Transparent Electrode Applications LCD Solar Cells Touch Screen Indium Tin Oxide (ITO) Zinc Oxide (ZnO) - High conductivity - High transparency - Resistant to environmental effects - Rare material (Indium) - Not compatible for flexible electronics - Very expensive deposition techniques - High conductivity - High transparency - Not resistant to environmental effects - Not compatible for flexible electronics - Very expensive deposition techniques
3 FLATLAND; a Romance of Many Dimensions! 2004 No. of Patent Publications related to Graphene/ Year; from the UK IP Office 2013
4 Graphene; a Unique Material Graphene can be considered as a zero-band gap semiconductor, that exhibits a linear dependence of the electron energy on the wave vector Electron States in C.B and V.B. have opposite chirality. An electron at graphene s Fermi Energy E f carries a fluctuating polarization that gives rise to both intraband and interband transitions leading to distinct optical properties. Unique electronic and optical properties High current densities, with high transmission Easy and inexpensive manufacturing techniques Compatible with flexible substrates
5 Energy The Future! Global New Investment in Clean Energy Technologies, (From climate Policy Memo #8) THE SUN IS ALL OURS!! To replace Indium Tin Oxide (ITO) as transparent electrodes for solar cells
6 Outline Graphene; growth, characterization Reducing the sheet resistance for transparent electrodes applications; - Stacking - Doping, - G/Cu Busbars - Graphene/ NT hybrid
7 Graphene Isolation Scotch tape Graphite Exfoliation Chemical Vapor Deposition Growth via CVD on Copper films; transferred in solution to any substrates 1 layer at a time; Uniform over large areas, 1 layer: / at 97 % transparency X. S. Li et al, Science, 2009, 324, 1312
8 Graphene; Characterizations. Optical Spectra
9 Medium Energy Ion Scattering - light ions (like He + ) with an energy of kev are incident along a major crystallographic direction in the solid. - Energy and angle resolved detection of backscattered ions provides surface structural and compositional information. - Depth profile is based on the energy loss of the ions traveling through the film. - Because it uses lower energy ions, the depth resolution is greatly improved. Yield (counts) MEIS Data Data Fit Energy (kev) The MEIS gives 1.2 layers of graphene; equivalent to nm thickness; these results were used to fit the ellipsometer measurements. M. Copel et al, Appl. Phys. Lett. 2011, 98(11),
10 Index of Refraction (n) Ellipsometer Measurements n k Extinction Coefficient (k) Wavelength (nm) The ellipsometer measurements gives a value of 2.5 and 1.9 for n and k respectively A. Kasry et al, J. Phys. Chem. C, 2012, 116 (4), 2858
11 Outline Graphene; growth, characterization Reducing the sheet resistance for transparent electrodes applications; - Stacking - Doping, - G/Cu Busbars - Graphene/ NT hybrid
12 5 strategies for reducing the sheet resistance Reducing the Sheet Resistance E F Stacking of Gr films E F Doping with Nitric Acid (P-Dopant) Stacking and Doping Metal busbars in contact with Gr films Gr/ nanotube hybrid
13 Graphene. Transparent Electrodes Stacking and Doping The conductivity increases with increasing the number of layers and by doping A. Kasry et al, ACS Nano, 2010, 4(7), 3838
14 Graphene. Transparent Electrodes ITO Stacking and Doping The optical conductivity increases with doping A. Kasry et al, ACS Nano, 2010, 4(7), 3838
15 Reducing the Sheet Resistance 5 strategies for reducing the sheet resistance E F Stacking of Gr films E F Doping with Nitric Acid (P-Dopant) Stacking and Doping Metal busbars in contact with Gr films Gr/ nanotube hybrid
16 Graphene. Copper Busbars The metal grid reduces the distance the charge has to travel in the metallic carbon-based film, reducing the effective sheet resistance of the composite layer United States Patent Application A. Kasry et al, Thin Solid Films, 2012, 520(15), 4827
17 Metallic Busbars to Reduce the Sheet Resistance! United States Patent Application A. Kasry et al, Thin Solid Films, 2012, 520(15), 4827
18 Reducing the Sheet Resistance 5 strategies for reducing the sheet resistance E F Stacking of Gr films E F Doping with Nitric Acid (P-Dopant) Stacking and Doping Metal busbars in contact with Gr films Gr/ nanotube hybrid
19 Graphene/ Nanotube Hybrid! Before Vacuum Annealing After Vacuum Annealing Annealing improves the coupling between the graphene and the nanotubes Ahmed Maarouf, Bhupesh Chandra,, YOR US1.filed to US Patent Office
20 Carbon Nanotube-Graphene Hybrid as Transparent Conductors One Graphene layer Graphene-NT Hybrid Two stacked graphene layers After Vacuum annealing (10 600oC) After Nitric Acid Doping 5.2 K Ohm 2.7 K / 4.1 K / Ohm 360 / 400 /
21 Carbon Nanotube-Graphene Hybrid as Transparent Conductors Transmittance (%) Graphene Nanotubes Hybrid Sheet Resistance (Ohm/ Square)
22 Graphene..a Future Sensor?! From the McAlpine group at Princeton University: Graphene sensor "tattooed" onto a tooth can be used to detect bacteria and wirelessly monitor oral hygiene. The graphene is printed onto water-soluble silk and can be "bio-transferred" onto tooth enamel. Once the film is applied to the tooth, the silk dissolves in water, leaving only the sensor in place. It uses antimicrobial peptides and a resonant coil, so bacteria cells can be detected without needing an on-board power supply.
23 Conclusions! Graphene is a very promising candidate to replace ITO as a transparent conductor for several applications like solar cell electrodes and touch screens nm nm nm Graphene could be prepared by CVD method, growth 1.1µm conditions were optimized, and optical parameter were determined nm 1.1µm The sheet resistance of Graphene layers grown by CVD could be reduced to be comparable with Conventional transparent electrodes. Transmission (a.u.) ITO After Doping dc / op = 14.7 Before Doping dc / op = 4.9 Multilayer nm Sheet Resistance (ohm/square) Challenge the Challenges! Conducted under and partially funded by the 2008 joint development agreement between IBM Research and the Government of the Arab Republic of Egypt through the Egypt Nanotechnology Center
24 One Layer Graphene 50 µm Optical Microscope Image AFM Image
25 Graphene; Characterizations. Raman Spectroscopy Raman spectroscopy is a result of inelastic scattering of a photon. It is used to study vibrational modes in a system. The Raman spectra of singlelayer graphene has three key characteristic peaks: G peak; is due to the vibrational mode of sp2 bonded carbon. 2D and D bands; are induced by defects in the structure Raman Intensity G 2D D Raman Shift (cm -1 )
26 Growth Optimization. SEM & AFM 2 m 2 m 2 m 10 min Anneal/ 10 min Growth 30 min Anneal/ 10 min Growth 60 min Anneal/ 10 min Growth SEM results of the graphene on Cu before the transfer; the graphene grown using 10 min annealing time and 10 min. growth are smoother 200nm 200nm 200nm
27 Growth Optimization. XPS & Raman 400 D 10 min Anneal-10 min Growth 30 min Anneal-10 min Growth 60 min Anneal-10 min Growth Intensity (a.u.) Raman Shift (cm -1 ) Intensoty (a.u.) 2500 C1s Before Transfer Binding Energy (e.v.) Intensoty (a.u.) C1s After Transfer Binding Energy (e.v.) Raman Results of the graphene after transfer; the graphene grown at 10 min annealing time and 10 min. growth has less defects!
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