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: Visualizing how radiation bombardment boosts superconductivity

Related Stories

A new chapter in Earth history

May 11, 2015

An international group of scientists has proposed that fallout from hundreds of nuclear weapons tests in the late 1940s to early 1960s could be used to mark the dawn of a new geological age in Earth history ...

Recommended for you

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.