Engineering SrSnO3 Phases and Electron Mobility at Room Temperature Using Epitaxial Strain
- Univ. of Minnesota, Minneapolis, MN (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Science and Technology of China, Anhui (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
High-speed electronics require epitaxial films with exceptionally high carrier mobility at room temperature (RT). Alkaline-earth stannates with high RT mobility show outstanding prospects for oxide electronics operating at ambient temperatures. However, despite significant progress over the last few years, mobility in stannate films has been limited by dislocations because of the inability to grow fully coherent films. Here, we demonstrate the growth of coherent, strain-engineered phases of epitaxial SrSnO3 (SSO) films using a radical-based molecular beam epitaxy approach. Compressive strain stabilized the high-symmetry tetragonal phase of SSO at RT, which, in bulk, exists only at temperatures between 1062 and 1295 K. We achieved a mobility enhancement of over 300% in doped films compared with the low-temperature orthorhombic polymorph. Using comprehensive temperature-dependent synchrotron-based X-ray measurements, electronic transport, and first principles calculations, crystal and electronic structures of SSO films were investigated as a function of strain. Furthermore, we argue that strain-engineered films of stannate will enable high mobility oxide electronics operating at RT with the added advantage of being optically transparent.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); Air Force Research Laboratory (AFRL), Air Force Office of Scientific Research (AFOSR); USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1490092
- Journal Information:
- ACS Applied Materials and Interfaces, Vol. 10, Issue 50; ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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