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: First scientific publication from data collected at NSLS-II

add to favorites email to friend print save as pdf

Related Stories

Boy or girl? Lemur scents have the answer

2 hours ago

Dozens of pregnancy myths claim to predict whether a mom-to-be is carrying a boy or a girl. Some say you can tell by the shape of a woman's bump, or whether she craves salty or sweet.

SOHO sees something new near the sun

4 hours ago

An unusual comet skimmed past the sun on Feb 18-21, 2015, as captured by the European Space Agency (ESA) and NASA's Solar and Heliospheric Observatory, or SOHO.

Train car design reduced impact in Southern California crash

4 hours ago

(AP)—After a horrific crash a decade ago that killed 11 people and injured 180 more, Southern California's commuter train network began investing heavily in passenger cars designed to protect passengers from the full force ...

Recommended for you

Unified theory for skyrmion-materials

7 hours ago

Magnetic vortex structures, so-called skyrmions, could in future store and process information very efficiently. They could also be the basis for high-frequency components. For the first time, a team of physicists ...

Scientists provide new data on the nature of dark matter

8 hours ago

Recent research conducted by scientists from the University of Granada sheds light on the nature of dark matter, one of the most important mysteries in physics. As indirect evidence provided by its gravitational ...

Why seashells' mineral forms differently in seawater

11 hours ago

For almost a century, scientists have been puzzled by a process that is crucial to much of the life in Earth's oceans: Why does calcium carbonate, the tough material of seashells and corals, sometimes take ...

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.