کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5426769 | 1395903 | 2006 | 8 صفحه PDF | دانلود رایگان |
Phosphine and tertiarybutylphosphine adsorption on the indium-rich InP (0 0 1)-(2 Ã 4) surface at 25 °C have been studied by internal reflection infrared spectroscopy, X-ray photoelectron spectroscopy, and low energy electron diffraction. Both molecules form a dative bond to the empty dangling bonds on the In-P heterodimers and the second-layer In-In dimers and vibrate symmetrically at 2319 (2315) and 2285 (2281) cmâ1 and asymmetrically at 2339 (2339) and 2327 (2323) cmâ1. A fraction of these species dissociate into adsorbed PH2 with the hydrogen and tertiarybutyl ligands transferring to nearby phosphorus sites. The calculated energy barriers for desorption (<11 kcal/mol) of these molecules is less than that for dissociation (>17 kcal/mol) and explains their low sticking probabilities at elevated temperatures under InP growth conditions.
Journal: Surface Science - Volume 600, Issue 21, 1 November 2006, Pages 4888-4895