About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Conference paper
Scanning tunneling microscopy study of the adsorption and recombinative desorption of hydrogen from the Si(100)-2x 1 surface
Abstract
A scanning tunneling microscopy and spectroscopy study of the adsorption and recombinative desorption of hydrogen from the Si(100)-2x 1 surface is presented. Initially at room temperature, hydrogen atoms singly occupy the Si dimer units resulting in the formation of isolated Si-H bonds and unpaired dangling bonds. At higher temperatures (— 630 K) these hydrogen atoms tend to pair up on the dimer units. Thus there is a thermodynamic preference for the hydrogen atoms to occupy the dimers in pairs. This pairing phenomenon is due to a 77-interaction between the dangling bonds on the Si(100)-2x 1 surface which favors pairing the unpaired dangling bonds on the dimer units. This pairing of dangling bonds in turn forces the hydrogen atoms to pair. Following desorption from the saturated surface, pairs of dangling bonds are found localized on the Si dimer units, suggesting that desorption involves the direct recombination of hydrogen atoms from the dimers units of the monohydride surface. The implications of this desorption mechanism are discussed and compared to earlier models. © 1992, American Vacuum Society. All rights reserved.