By: Regina Ramazzini

Indium Tin Oxide (ITO) is used as a transparent conducting oxide film in electronics, displays, windows and other devices. A highly reproducible and scalable process for making an ITO alternative that is highly transparent and has superior conductivity has been developed.

“Researchers at the University of Minnesota have developed a novel growth approach for the synthesis of doped barium tin stannate (BSO) for use as a transparent conductive oxide (TCO).  The material produced has high room-temperature conductivity and mobility when the dopant is lanthanum. The value of conductivity achieved is comparable to that of the best reported value for indium-tin-oxide (ITO), the industry standard for transparent conducting oxide.

While other approaches have demonstrated the promise of Lanthanum-doped BSO as a replacement for ITO, these approaches lack reproducibility and the material produced has lower conductivity and transparency.

The novel synthesis approach involves using a chemical precursor for tin as a substitute for a solid tin source in a hybrid molecular beam epitaxy system. The advantages include better structural quality of the films, scalable growth rates and high reproducibility. A variety of dopants can be used including lanthanum, neodymium, and gadolinium.”