메뉴 건너뛰기




Volumn 12, Issue 1, 2000, Pages 33-37

Frontier orbital model of semiconductor surface passivation: Dicarboxylic acids on n- and p-GaAs

Author keywords

[No Author keywords available]

Indexed keywords

CARBOXYLIC ACIDS; ELECTRON ENERGY LEVELS; MOLECULAR DYNAMICS; MOLECULAR STRUCTURE; PASSIVATION; SURFACE TREATMENT;

EID: 0033875845     PISSN: 09359648     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-4095(200001)12:1<33::AID-ADMA33>3.0.CO;2-B     Document Type: Article
Times cited : (43)

References (29)
  • 9
    • 0342841825 scopus 로고    scopus 로고
    • note
    • While complete passivation of a semiconductor surface means that there are no (more) electronically active states in the gap (see also [18]), in the more common case of partial passivation use of the concept tells us nothing about changes in surface-state positions and in their density (including creation and annihilation of states).
  • 12
    • 0343276617 scopus 로고    scopus 로고
    • note
    • A discussion of the generalized acid-base concept, derived from the so-called "Usanovich" definition, can be found in [10], pp. 292ff. A discussion on the frontier orbital form of the Usanovich definition, as used here, can be found in [11], pp. 181ff.
  • 18
    • 0343712127 scopus 로고    scopus 로고
    • note
    • In the case of strong molecule-surface interaction, all of the empty and the filled surface states could be "pushed" out of the bandgap, leading to complete surface passivation. Proper oxidation of Si leads to a situation that is very close to this (although still not sufficient to satisfy today's advanced device requirements).
  • 19
    • 0342841819 scopus 로고    scopus 로고
    • note
    • Within the scope of this paper, we do not discuss molecular effects on surface recombination rates. This is because, for the GaAs surfaces studied here, time-resolved photoluminescence measurements revealed no significant molecular effect. For an experimental and theoretical analysis of molecular effects on surface recombination rates at other semiconductor surfaces, see [29].
  • 20
    • 0343276616 scopus 로고    scopus 로고
    • M.Sc. Thesis, Weizmann Institute of Science, Rehovot
    • A. Vilan, M.Sc. Thesis, Weizmann Institute of Science, Rehovot 1996.
    • (1996)
    • Vilan, A.1
  • 25
    • 0342406898 scopus 로고    scopus 로고
    • note
    • This difference in surface state density between type I and II samples is probably due to differences in the manufacturing processes used by the two suppliers.
  • 26
    • 0343712122 scopus 로고    scopus 로고
    • note
    • While electrons in surface energy levels that lie inside the "forbidden" bandgap are localized on and very near the surface, those in energy levels outside the bandgap are much less so. Such "surface resonances" are only to a limited extent localized in the surface region, are degenerate with the bulk states, and can mix with them [3]. There is no quantitative measure of how strong surface localization should be in order to be defined as a surface resonance [27].
  • 28
    • 0343712123 scopus 로고    scopus 로고
    • note
    • Considering the uncertainty in the LUMO energy level of the DHDC molecule, we assume that the molecular level, after interaction, is still above the Fermi level.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.