Linear Optical Properties of Si Surfaces and Nanostructures

Rossów, U.; Mantese, L.; Aspnes, D. E.; Bell, K.A.; Ebert, Martin

doi:10.1002/(sici)1521-3951(199909)215:1<725::aid-pssb725>3.0.co;2-c

Cited by 6 publications

(11 citation statements)

References 14 publications

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“…This spectrum closely matches those in the literature. 13,15,19,31 After exposure to 0.3 L of 9,10phenanthrenequinone (Figure 3b), the intensity of the 3.0 and 3.7 eV features decreases, while the intensity of the 4.3 eV feature is altered asymmetrically with the lower energy portion more greatly attenuated. A new, sharp negative feature is evident at 5.2 eV.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, it has been fit to a surface-modified bulk wave function caused by the localization of the optical response at the surface or interface. 18,19 While the silicon surface gives rise to features detectable in RDS, it is significant that these features all occur at energies less than 5 eV.…”

Section: Discussionmentioning

confidence: 99%

“…9,10 Since bulk silicon is symmetric, measurement of the optical properties using polarized light can then be used to characterize the optical response of the near-surface region. 11,12 While this method has been applied previously to characterize the changes in optical properties of different surface reconstructions and the effects of atomic adsorbates, [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] it has not been widely used to characterize the optical properties of organic molecules. [32][33][34][35][36] To use polarization spectroscopy on organic films, it is necessary to have organic layers that have a preferred orientation in the surface plane.…”

Section: Introductionmentioning

confidence: 99%

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Optical and Electronic Anisotropy of a π-Conjugated Molecular Monolayer on the Silicon(001) Surface

Hacker

Hamers

2003

J. Phys. Chem. B

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The electronic and optical properties of an oriented monolayer of a π-conjugated molecule, 9,10phenanthrenequinone on a silicon(001) substrate were investigated. The adsorption of 9,10-phenanthrenequinone onto a single-domain, 4°-miscut Si(001) surface leads to an oriented monolayer film with intact π conjugation. Reflectance-difference spectroscopy (RDS) was used to probe the optical properties of the layer of 9,10phenanthrenequinone, and comparison spectra were obtained on a monolayer 1,2-cyclohexanedione, a nonconjugated molecule that has a nearly identical structure at the Si-O-C interface. RDS spectra of the 9,10-phenanthrenequinone monolayer show a strong absorption feature at 5.2 eV due to π-π * transitions within the molecule, while spectra of the nonconjugated analogue show no feature in this region. Further information about the electronic structure is provided by ultraviolet photoemission spectroscopy of the chemisorbed monolayers and by ultraviolet-visible absorption spectroscopy of the parent compounds. The experiments confirm that it is possible to create a macroscopic optical anisotropy in organic films on silicon surfaces using the Si(001) dimers to control the molecular orientation.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical and Electronic Anisotropy of a π-Conjugated Molecular Monolayer on the Silicon(001) Surface

Hacker

Hamers

2003

J. Phys. Chem. B

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“…The optical anisotropy of the Si͑001͒ surface has been intensively studied by both experiment 7,8,[13][14][15][16][17][18] and theory, [18][19][20][21][22][23] due to its technological importance and its model character for semiconductor surface science. The understanding of the origins of particular features in the RAS of Si͑001͒ is limited, however, in spite of these efforts.…”

Section: Introductionmentioning

confidence: 99%

Terrace and step contributions to the optical anisotropy of Si(001) surfaces

2001

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The contributions of atomically flat terraces as well as of S A , S B , and D B steps to the optical anisotropy of Si͑001͒ surfaces have been calculated using a real-space multigrid method together with ab initio pseudopotentials. Our results for ideal (1ϫ2), p(2ϫ2), and c(2ϫ4) reconstructed surfaces show a distinct influence of the dimer arrangement on the optical spectra. The calculated spectrum for the Si(001)c(2ϫ4) surface agrees best with the signal measured for atomically smooth terraces. The significant optical anisotropy around 3 eV observed for vicinal surfaces, however, is induced by surface steps. Both electronic transitions directly at the surface as well as in deeper layers contribute to the optical anisotropy. We identify two mechanisms causing anisotropy signals from layers beneath the surface: the influence of the anisotropic surface potential on the bulk wave functions as well as minor contributions from atomic relaxations caused by surface-induced stress.

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“…4, none of the RA or the R spectra show an exaggerated structure near the E 1 and E 1 +∆ 1 critical points as it could be expected for a material with a zinc-blende lattice and a cubic symmetry (9).…”

Section: Resultsmentioning

confidence: 76%

Reflection Anisotropy Study of ZnTe Around the E1 and E1+Δ1 Critical Points

2007

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We report on a study of the reflection anisotropy (RA) experimental line shape for ZnTe near the E 1 and E 1 +∆ 1 transition regions. The measured RA spectrum was analyzed using the effective medium theory, the dislocation-induced piezo-optic model, and compared with the calculated normal-incidence reflectance. Results suggest that a simple change of sign in the dislocation-induced piezo-optic model can explains one part of the measured RA spectrum within the studied transitions, and that the first energy derivatives of the measured RA and the calculated R spectra show a similar behavior. No derivativelike, ε-like or 1/ε-like line shapes are observed in the measured RA spectrum.

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Linear Optical Properties of Si Surfaces and Nanostructures

Cited by 6 publications

References 14 publications

Optical and Electronic Anisotropy of a π-Conjugated Molecular Monolayer on the Silicon(001) Surface

Optical and Electronic Anisotropy of a π-Conjugated Molecular Monolayer on the Silicon(001) Surface

Terrace and step contributions to the optical anisotropy of Si(001) surfaces

Reflection Anisotropy Study of ZnTe Around the E1 and E1+Δ1 Critical Points

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