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Fabrication and Characterization of Transparent and Flexible Conductive Layers Based on Copper Nanofibers

Nikzad Alhosseini, Mohammad Javad | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53473 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Sadrnezhad, Khatiboleslam; Mahdavi, Mohammad
  7. Abstract:
  8. The Transparent electrode (transparent conductive layer) is an essential component of electro-optical devices, especially screens, solar cells and touch screens. Today, most semiconductor oxides such as ITO are used for this purpose, which have problems such as inflexibility, high cost, environmental degradation and ion penetration in organic displays. In this research, the design, simulation and fabrication of a transparent electrode with a network of metal nanowires with low resistance between cross fibers and high aspect ratio during the production stages of polymer mold, metal coating and characterization has been done. Using the reducing atmosphere in the sputtering chamber, the conductivity of the sputtered copper nanofilm is improved fivefold, and with the production of suspended and aligned metal nanowires, the efficiency index is increased and a resistance of 5 Ω/sq is achieved at 90% transparency. Due to the effect of geometric parameters on transparency and conductivity, the optimal structure was calculated using optical simulation. A wave optics kit based on Maxwell's classical theory and experimental data was developed to calculate the light transmission in a metal nanowire network, which, unlike previous work, includes the interaction of light with a metal network such as LSPR, SPP and RA. The results show that LSPR has the greatest decrease in transparency, while increasing the thickness to width ratio of metal nanowires can reduce its effect or transfer it to out of visible region. Comparing 900 different structures, the highest nanowire network performance index was obtained in 300 nm step with minimum thickness (10 nm) and maximum width (100 nm)
  9. Keywords:
  10. Localized Surface Plasmons ; Surface Plasmon Polariton ; Surface Plasmon Resonance ; Finite Difference Time Domain (FDTD) ; Flexible Transparent Electrode ; Copper Metal Nanowire Network ; Transparent Thin Conductive Layer

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