Research (Under Remodeling,
please check back in a few days)
our laboratory, we use molecular beam epitaxy (MBE) to enable the
extremely precise, low defect materials with unique properties. A unique multi-chamber MBE has been established with
each of the VG-Semicon growth chambers linked together with a UHV
transfer tube system operating at a base pressure of about 10-11 mbar.
II-VI growth is performed in a V80H growth chamber equipped
with two vertical e-beam evaporators, enabling the growth of high
melting temperature metals such as Hf, Mo, W, and Fe, in addition to
effusion cell evaporation of Se, Te, Zn, Bi, and Be. The two
e-beam evaporators allow for TMD and topological insulator
heterostructure growth as well as mixed transition metal TMDs and
magnetic doping, providing significant flexibility in material and
device design. The chamber is also equipped with ZnCl2 and
nitrogen plasma sources for doping and surface functionalization.
III-V chamber is also a V80H with recently upgraded hardware and
software to provide state-of-the-art growth capabilities including In,
Ga, As, B, Al, and N compounds as well as in-situ H-cleaning and Be and
Si doping. The Group IV chamber, a V90S, is used to grow Si, Ge,
and Sn epitaxial films,SiSnGe compounds, and strained heterostructures.
The vertical growth chamber in this system incorporates
electron-beam evaporators and effusion cells for Sb and B doping.
Preparation chambers with high temperature heating stages are
available for each material system. Each growth chamber is
equipped with in-situ RHEED allowing us to assess the growth quality in
MBE capabilities allow
us to study
materials that are important for a number of applications such as:
have established collaborations
with other researchers in Materials Science, Physics, Electrical
and Chemistry. We work closely with
researchers at NIST and from other universities (for example NC State,
Dublin City University, and University College Cork), and we maintain
projects and collaborations with U.S. Industries (Texas Instruments,
SRC, SEMATECH). Our goal is to develop a
understanding of the issues associated with energy harvesting,
storage to significantly advance the scientific community, while
to technological advances and environmental responsibility.