Pyramid (IMAGE) Penn State Caption This is a transmission electron microscope cross-section of the vertical TFET. The interface of the source and channel is the point where electron tunneling occurs. ILD is the interlayer dielectric separating the contacts. Top plane contacts are gold (Au), palladium (Pd), and molybdenum (Mo). Credit Suman Datta/Penn State Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.