Image (IMAGE) University of Tsukuba Caption Researchers from the University of Tsukuba have produced a record-breaking polycrystalline germanium (Ge) thin film on a flexible polyimide substrate. Tuning the growth temperature and thickness of the GeOx underlayer gave a Ge film with large crystals and a hole mobility of 690 cm2 V−1 s−1, the highest reported for an insulator-supported semiconductor. The high-performance, flexible material is expected to contribute to the development of electronics for large-scale initiatives such as the internet of things. Credit University of Tsukuba Usage Restrictions Unauthorized use is prohibited. License Original 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.