AVS 50th International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP26
Adsorption of 1,3-butadiene on Si(001) 2x1 Surface

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: J.Y. Baik, Korea Research Institute of Chemical Technology and Sungkyunkwan University, Korea
Authors: J.Y. Baik, Korea Research Institute of Chemical Technology and Sungkyunkwan University, Korea
H.-N. Hwang, Korea Research Institute of Chemical Technology
K.-S. An, Korea Research Institute of Chemical Technology
E.S. Cho, Sungkyunkwan University, Korea
K.J. Kong, Korea Research Institute of Chemical Technology
Y. Kim, Korea Research Institute of Chemical Technology
J.-Y. Park, Sungkyunkwan University, Korea
Correspondent: Click to Email
Recently unsaturated organic molecules playing a role of multifunctional layer adsorbed on Si(001)2x1 surface has come into the focus of research in semiconductor fabrication and semiconductor devices. The well-known unstable @pi@ bond of up and down dimer atoms of Si(001)2x1 surface, ethylene-like(C@sub 2@H@sub 4@), is reactive with the unsaturated organic molecule through charge transfer in order to minimize the total energy on the surface. 1,3-butadiene(C@sub 4@H@sub 6@) among these molecules leads to the [4+2] reaction forming the organic molecule/Si hybrid of six-membered cycle with the Si dimer even at room temperature. And also, it was reported that the [2+2] reaction could occur at less possibility than the [4+2] reaction. In this study, the adsorption and thermal behaviors of 1,3-butadiene on the Si(001)2x1 surface were investigated by high-resolution photoelectron spectroscopy(HRPES), scanning tunneling microscopy(STM) and thermal desorption spectroscopy(TDS) with theoretical calculations. In STM images, three different-typed adsorptions were observed and well identified as the [4+2], the [2+2], and the end-edge bridge reaction by the STM simulation. For C 1s core level spectrum reported as only one asymmetric component, despite of two kinds of quite different chemical surroundings, it was found that the broad spectrum consisted of two components with abnormally small core level shift based on the calculation. In addition, TDS shows successive desorption of 1,3-butadiene and acetylene molecules with increasing the substrate temperature, different to previous reported hydrogen desorption by C-H bond breaking, without acetylene desorption.