Erik Jonsson School of Engineering & Computer Science Materials Science and Engineering UT Dallas
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research (Under Remodeling, please check back in a few days)

In our laboratory, we use molecular beam epitaxy (MBE) to enable the growth of 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.  The 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 real-time.

These MBE capabilities allow us to study materials that are important for a number of applications such as:

  • Transition Metal Dichalcogenides: 

 

  • Topological Insulators: 

 

 

We have established collaborations with other researchers in Materials Science, Physics, Electrical Engineering, and Chemistry.  We work closely with researchers at NIST and from other universities (for example NC State, Purdue, Dublin City University, and University College Cork), and we maintain ongoing projects and collaborations with U.S. Industries (Texas Instruments, SRC, SEMATECH).  Our goal is to develop a fundamental understanding of the issues associated with energy harvesting, reduction, and storage to significantly advance the scientific community, while greatly contributing to technological advances and environmental responsibility.