Structural Phase Transitions at Clean and Metal-Covered Si(111) Surfaces Investigated by Rheed Spot Analysis

Shuji Hasegawa, Yasuyoshi Nagai, Toshio Oonishi, Nobuhiko Kobayashi, Takashi Miyake, Shuuichi Murakami, Yuuji Ishii, Daiki Hanawa, Shozo Ino

Research output: Contribution to journalReview article

10 Citations (Scopus)

Abstract

Structural phase transitions between various kinds of superlattice structures formed on a Si(111) surface have been investigated by spot analysis of reflection high-energy electron diffraction (RHEED). Reversible transitions induced by temperature changes and irreversible ones induced by metal depositions were observed. Detailed discussions on the dynamics of the phase transitions are made by quantitative analyses of integrated spot intensity and profile. For a phase transition of 7x7âŸ1x1 structures on a clean Si(111) surface, a hysteresis with temperature difference of 5° C between in heating and cooling processes was found in the spot intensity change, indicating a first-order transition. Hysteresis was hardly recognized, on the other hand, for transitions of Au-induced superstructures (5 x 2-Au or √3 x √-au). 1x1-Au. The spot profiles were found to be broadened during the transition of Si (111)-√3 x-√3-Au ⟠l x 1-Au, which was a signature of a continuous transition, while the profiles remained unchanged during the transitions of the 7x7âŸ.1x1 and 5x2-Au âŸ. 1x1-Au phases. Structural conversions induced by In adsorption on the Si(111) surface kept at constant temperatures were also analyzed. The conversions at room temperature were totally dependent on the initial substrate surface structures; the 7 x 7 surface did not show any structural conversion with In adsorption, while the √3x√3-In surface successively converted to a 2x2 and a √7x √3 phase with coverage increase. The structural transitions at elevated temperatures were sensitively dependent on the temperatures. Sequences of transitions among the 7x7, 4x1, √3x√3, √31 x √31, and √43x4 were quantitatively revealed as changes in RHEED spot intensity.

Original languageEnglish
Pages (from-to)87-114
Number of pages28
JournalPhase Transitions
Volume53
Issue number2-4
DOIs
Publication statusPublished - Mar 1 1995

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Phase transitions
Metals
metals
Reflection high energy electron diffraction
Temperature
Hysteresis
Adsorption
high energy electrons
Surface structure
electron diffraction
profiles
hysteresis
Cooling
adsorption
Heating
temperature
Substrates
temperature gradients
signatures
cooling

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Materials Science(all)

Cite this

Structural Phase Transitions at Clean and Metal-Covered Si(111) Surfaces Investigated by Rheed Spot Analysis. / Hasegawa, Shuji; Nagai, Yasuyoshi; Oonishi, Toshio; Kobayashi, Nobuhiko; Miyake, Takashi; Murakami, Shuuichi; Ishii, Yuuji; Hanawa, Daiki; Ino, Shozo.

In: Phase Transitions, Vol. 53, No. 2-4, 01.03.1995, p. 87-114.

Research output: Contribution to journalReview article

Hasegawa, S, Nagai, Y, Oonishi, T, Kobayashi, N, Miyake, T, Murakami, S, Ishii, Y, Hanawa, D & Ino, S 1995, 'Structural Phase Transitions at Clean and Metal-Covered Si(111) Surfaces Investigated by Rheed Spot Analysis', Phase Transitions, vol. 53, no. 2-4, pp. 87-114. https://doi.org/10.1080/01411599508200391
Hasegawa, Shuji ; Nagai, Yasuyoshi ; Oonishi, Toshio ; Kobayashi, Nobuhiko ; Miyake, Takashi ; Murakami, Shuuichi ; Ishii, Yuuji ; Hanawa, Daiki ; Ino, Shozo. / Structural Phase Transitions at Clean and Metal-Covered Si(111) Surfaces Investigated by Rheed Spot Analysis. In: Phase Transitions. 1995 ; Vol. 53, No. 2-4. pp. 87-114.
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abstract = "Structural phase transitions between various kinds of superlattice structures formed on a Si(111) surface have been investigated by spot analysis of reflection high-energy electron diffraction (RHEED). Reversible transitions induced by temperature changes and irreversible ones induced by metal depositions were observed. Detailed discussions on the dynamics of the phase transitions are made by quantitative analyses of integrated spot intensity and profile. For a phase transition of 7x7{\^a}Ÿ1x1 structures on a clean Si(111) surface, a hysteresis with temperature difference of 5° C between in heating and cooling processes was found in the spot intensity change, indicating a first-order transition. Hysteresis was hardly recognized, on the other hand, for transitions of Au-induced superstructures (5 x 2-Au or √3 x √-au). 1x1-Au. The spot profiles were found to be broadened during the transition of Si (111)-√3 x-√3-Au {\^a}Ÿ l x 1-Au, which was a signature of a continuous transition, while the profiles remained unchanged during the transitions of the 7x7{\^a}Ÿ.1x1 and 5x2-Au {\^a}Ÿ. 1x1-Au phases. Structural conversions induced by In adsorption on the Si(111) surface kept at constant temperatures were also analyzed. The conversions at room temperature were totally dependent on the initial substrate surface structures; the 7 x 7 surface did not show any structural conversion with In adsorption, while the √3x√3-In surface successively converted to a 2x2 and a √7x √3 phase with coverage increase. The structural transitions at elevated temperatures were sensitively dependent on the temperatures. Sequences of transitions among the 7x7, 4x1, √3x√3, √31 x √31, and √43x4 were quantitatively revealed as changes in RHEED spot intensity.",
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AU - Kobayashi, Nobuhiko

AU - Miyake, Takashi

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