Epitaxial Bi2Sr2CuOu y thin films as p-type transparent conductors

Abstract

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 Bi2Sr2CaCu2O y thin films. In this study, epitaxial superconducting Bi2Sr2CuO y and Bi2Sr1.8Nd0.2CuO y thin films with superior normal state conductivity are proposed as p-type transparent conductors. It is found that the Bi2Sr1.8Nd0.2CuO 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.