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Investigation of ultra-thin and flexible Au–Ag–Au transparent conducting electrode
Ch Surya Prakasarao,Pratim Hazarika,Slavia Deeksha DSouza,Jean Maria Fernandes,M. Kovendhan,R. Arockia Kumar,D. Paul Joseph 한국물리학회 2020 Current Applied Physics Vol.20 No.10
The performance of ultra-thin Au–Ag–Au tri-layer film deposited thermally over a flexible substrate is investigated using structural, optical, mechanical and electrical-transport measurements. The optimum total thickness of the tri-layer for high transparency and conductivity is determined to be around 8 nm using a theoretical model. The Au–Ag–Au tri-layer shows maximum transmittance (≅ 62%) at wavelength 500 nm. XRD pattern shows peak corresponding to (111) plane of Au and/or Ag. Sheet resistance (≅ 10.42 Ω/□) measured at 300 K using four probe technique is stable up to 150 °C. Hall effect measurements show high conductivity (1.34 × 105 (Ω cm)−1), carrier concentration (2.48 × 1023/cm3), and mobility (3.4 cm2/Vs). Scotch tape test confirms good adhesion of the film onto PET substrate. Bending-twisting tests using an indigenous apparatus indicate high resistance-stability even after 50,000 cycles. These results imply the viability of Au–Ag–Au tri-layer film as a transparent conducting electrode worth exploring for optoelectronic applications.