Epitaxial Bi₂Sr₂CuOu_y thin films as p-type transparent conductors

Development of p-type transparent conducting thin films is tireless due to the trade-off issue between optical transparency and conductivity. The rarely concerned low normal state resistance makes Bi-based superconducting cuprates the potential hole-type transparent conductors, which have been realized in Bi 2 Sr 2 CaCu 2 O y thin films. In this study, epitaxial superconducting Bi 2 Sr 2 CuO y and Bi 2 Sr 1.8 Nd 0.2 CuO y thin films with superior normal state conductivity are proposed as p-type transparent conductors. It is found that the Bi 2 Sr 1.8 Nd 0.2 CuO y thin film with thickness 15 nm shows an average visible transmittance of 65% and room-temperature sheet resistance of 650 Ω/sq. The results further demonstrate that Bi-based cuprate superconductors can be regarded as potential p-type transparent conductors for future optoelectronic applications.