Growth front of gallium-arsenide crystals determined by synchrotron X-rays

Feb 24, 2006
SPring-8
SPring-8, the largest third-generation (8 GeV) synchrotron radiation facility in the world, provides the most powerful synchrotron radiation currently available.

Japan Atomic Energy Agency (JAEA) scientists have developed a novel technique to determine atomic arrangements and atomic species on semiconductor surfaces during growth using x-rays from SPring-8, a synchrotron radiation facility.

"This technique," says Dr. Masamitu Takahasi of Quantum Beam Science Directorate, "may help improve semiconductor devices used in advanced communication systems, such as mobile phones, optical networking, wireless LAN, and car navigation systems, and may even accelerate the development of new electronic devices."

Dr. Takahasi and his coworkers have integrated a crystal growth chamber with an x-ray diffractometer at SPring-8 beamline, BL11XU. Then they used this setup to observe the surface of gallium arsenide under growth conditions. Using multi-energy x-rays, they identified both the atomic species and the atomic arrangement in the surface region.

Unlike conventional diffraction techniques, which observe "monochromatic" atomic arrangements, this technique can be compared to "color" imaging of the surface structure. In their most recent work, they experimentally demonstrated that a surface structure called c(4x4), which is observed under certain growth conditions, has dimmers that consist of gallium and arsenic atoms in the topmost layer.

This work was published in Physical Review Letters, Vol. 96, No. 5 on February 8, 2006.

Article: "Element-Specific Surface X-Ray Diffraction Study of GaAs(001)-c(4×4)" Masamitu Takahasi and Jun'ichiro Mizuki Phys. Rev. Lett. 96, 055506 (2006), online published 8 February 2006

Source: Japan Synchrotron Radiation Research Institute

Explore further: New technology makes creating ultrashort infrared laser pulses easy and cheap

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

New pathway to valleytronics

12 hours ago

A potential avenue to quantum computing currently generating quite the buzz in the high-tech industry is "valleytronics," in which information is coded based on the wavelike motion of electrons moving through ...

New portable vacuum standard

Jan 26, 2015

A novel Portable Vacuum Standard (PVS) has been added to the roster of NIST's Standard Reference Instruments (SRI). It is now available for purchase as part of NIST's ongoing commitment to disseminate measurement ...

Hybrid memory device for superconducting computing

Jan 26, 2015

A team of NIST scientists has devised and demonstrated a novel nanoscale memory technology for superconducting computing that could hasten the advent of an urgently awaited, low-energy alternative to power-hungry conventional ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.