Epitaxial Bi2Sr2CuOy 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 Bi2Sr2CaCu2Oythin films. In this study, epitaxial superconducting Bi2Sr2CuOyand Bi2Sr1.8Nd0.2CuOythin films with superior normal state conductivity are proposed as ptype transparent conductors. It is found that the Bi2Sr1.8Nd0.2CuOythin film with thickness 15 nm shows an average visible transmittance of 65% and room-temperature sheet resistance of 650 ?/sq. The results further demonstrate that Bi-based cuprate superconductors can be regarded as potential p-type transparent conductors for future optoelectronic applications.