Enhanced Deseleniumization of Selenophene Molecules Adsorbed on Si(100)-2x1 Surface
SCIE
SCOPUS
- Title
- Enhanced Deseleniumization of Selenophene Molecules Adsorbed on Si(100)-2x1 Surface
- Authors
- Lee, HK; Park, J; Kim, KJ; Kim, HD; Lee, IJ; Shin, HJ; Kim, B; Yu, BD; Hong, S; Chung, JW
- Date Issued
- 2011-09-15
- Publisher
- ACS publications
- Abstract
- We report the bonding structure of the selenophene molecules adsorbed on the Si(100)-2 x 1 surface at 300 K, and its evolution upon annealing investigated by adopting core-level photoemission spectroscopy, near-edge X-ray absorption fine structure (NEXAFS), and ab initio calculations. The Si 2p, C 1s, Se 3d core-level spectra measured at two temperatures, 300 and 350 K., are consistently interpreted in terms of the two major structures suggested by theory, a twisted (T) 2,5-dihydroselenophene (T-DHS) and a T-deseleniumization where the selenium atom is dissociated from the selenophene ring. We find a significantly enhanced deseleniumization of selenophene molecules by mild thermal annealing indicating that these two equally abundant structures at 300 K become a single uniform phase of the T-deseleniumization structures at 350 K by overcoming a relatively low dissociation energy barrier between the two structures. In addition, we obtain an average tilt angle of a selenophene ring at 300 K from our NEXAFS spectra alpha similar to 53 +/- 3 degrees, which represents an ensemble average of the tilt angles, alpha = 15 degrees of the T-DHS and 75 degrees of the T-deseleniumization.
- Keywords
- SCANNING-TUNNELING-MICROSCOPY; PHOTOELECTRON-SPECTROSCOPY; THERMAL-DESORPTION; ORGANIC-MOLECULES; SI(001) SURFACE; THIOPHENE; ADSORPTION; FURAN; ENERGY; CYCLOADDITION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16696
- DOI
- 10.1021/JP203894V
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, vol. 115, no. 36, page. 17865 - 17860, 2011-09-15
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