A5035130274- Nanowire Synthesis and Applications
- Photonic and Optical Devices
- Semiconductor materials and devices
- Advanced MEMS and NEMS Technologies
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
Stanford University
2020-2023
Short-range order (SRO) in semiconductor alloys, a relatively under-studied structural phenomenon which local atomic arrangements differ from those of random solid solution, is investigated molecular beam epitaxy (MBE)-grown GeSn thin films. A novel preparation technique used to pattern these films into microscale ribbons that are released the substrate for extended x-ray absorption fine structure (EXAFS) analysis. The results indicate strong SRO first shell around Sn atoms greatly denuded...
Short-range atomic order in semiconductor alloys is a relatively unexplored topic that may promote design of new materials with unexpected properties. Here, local ordering investigated Ge–Sn alloys, group-IV system attractive for its enhanced optoelectronic properties achievable via direct gap Sn concentrations exceeding ≈10 at. %. The substantial misfit strain imposed on thin films during growth bulk Si or Ge substrates can induce defect formation; however, be accommodated by growing alloy...
Core-shell Ge/GeSn nanowires provide a route to dislocation-free single crystal germanium-tin alloys with desirable light emission properties because the Ge core acts as an elastically compliant substrate during misfitting GeSn shell growth. However, uniformity of tin incorporation reduced pressure chemical vapor deposition may be limited by kinetics mass transfer The balance between Sn precursor flux and available surfaces for nucleation growth determines whether defects are formed their...
As a direct bandgap Group IV alloy, metastable Ge1–xSnx (x > ∼0.1) is an extremely interesting optical and electronic material. Germanium core/germanium-tin coaxial heterostructures offer opportunity to study Sn surface segregation from alloys in the technologically composition range that exceeds maximum solid solubility of tin diamond cubic structure germanium. We investigate annealing characteristics germanium-tin native oxide for contents 2 12 at% initial conditions ranging intentional...