Solution photochemistry of poly(dialkylsilanes): a new class of photoresists

Michl, Josef; Downing, J. W.; Karatsu, Takashi; McKinley, Allan J.; Poggi, Gabriella; Wallraff, G. M.; Sooriyakumaran, Ratnam; Miller, Robert D.

doi:10.1351/pac198860070959

Cited by 80 publications

(34 citation statements)

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“…The visible emissions of polysilanes have been widely investigated. The origins of visible emission have been attributed to (1) branch of silicon backbone [11], (2) -* charge transfer transition [12,13], (3) photolysis product [14] or (4) extrinsic impurity emission [15]. The steric hindrance of the alkoxyl groups affected the emission behaviors.…”

Section: Oxygen-crosslinkingmentioning

confidence: 99%

Oxygen-crosslinked polysilane: the new class of Si-related material for electroluminescent devices

Hiraoka

Majima

Murai

et al. 1997

Polym. Adv. Technol.

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The preparation and optical properties of the novel silicon‐related material named oxygen‐crosslinked polysilane were investigated. The oxygen‐crosslinked polysilane was prepared by the thermal annealing of the precursor polysilane bearing alkoxyl groups. The photoluminescence consisting of a broad visible band at about 440 nm and a relatively sharp band at about 360 nm was observed at room temperature. The relative intensities of the visible emission were changed during the crosslinking. The visible emission was greatly affected by the steric hindrance of the alkoxyl groups of the precursor. The visible electroluminescene (EL) was also observed uniformly from the EL cell consisting of the oxygen‐crosslinked polysilane film sandwiched between A1 electrode and indium‐tin‐oxide (ITO) electrode. The current densities of the EL cell increased with an increase in the oxygen‐crosslinking. © 1997 John Wiley & Sons, Ltd.

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Section: Oxygen-crosslinkingmentioning

confidence: 99%

Oxygen-crosslinked polysilane: the new class of Si-related material for electroluminescent devices

Hiraoka

Majima

Murai

et al. 1997

Polym. Adv. Technol.

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“…Early semiempirical and ab initio calculations suggested that these σ→σ* excitation energies are highly dependent on the backbone conformation along the Si−Si chain 11, 12. For example, the striking thermochromism of polysilane solutions, namely the bathochromic shift of the absorption in the near UV upon cooling, has been attributed to the increase of the relative population of all‐ trans segments at lower temperatures 10, 13, 14. Recent research focused primarily on tetrasilanes, which are the simplest oligosilanes that offer backbone conformations.…”

mentioning

confidence: 99%

Gauche, Ortho, Transoid andAnti Conformations of the Tetrasilanes SiMe3SiX2SiX2SiMe3 (X=H, F, Cl, Br, I): A Computational and Vibrational Spectroscopic Study

Zink¹,

Tekautz²,

Kleewein³

et al. 2001

ChemPhysChem

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The energy profile for rotation around the central Si−Si bonds of the tetrasilanes SiMe3SiX2SiX2SiMe3 (X=H, F, Cl, Br and I) were examined by ab initio calculations and temperature‐dependent Raman spectroscopy. Ethanelike intrinsic barriers to rotation were found for X=H, Cl, Br and I. MP2 calculations predict for SiMe3SiF2SiF2SiMe3 the existence of a gauche minimum with backbone dihedral angle ω≈64° and a twisted minimum with ω≈115°, as shown in the picture (solid line=HF, dashed line=MP2). The curious 115° local minium can be accounted for by a unique intrinsic barrier to rotation superimposed by electrostatic interactions involving strongly polar SiF bonds.

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“…[24,26,28] The short radiative lifetimes, narrow spectral band width, and lack of fine structure of the fluorescence is suggestive of a highly delocalized excited state. Comparison of the absorption and emission spectra of poly(di-n-hexylsilane) in solution suggests that emission is occurring from segments containing 20-36 silicon atoms, assuming that the oscillator strength is independent of the chromophore length.…”

Section: Advanced M Aterl Alsmentioning

confidence: 99%

Polysilanes—a new look at some old materials

Miller

1989

Advanced Materials

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In spite of the fact that the first polysilane derivatives were probably prepared in the mid 1920's, there was little scientific interest until recently. The synthesis of the first soluble homo and copolymers about 10 years ago has stimulated an explosive development of this class of materials. This brief review traces the historical development of the polysilanes and focuses on recent studies of polymer structure, electronic properties, photochemical reactions and mechanisms and finally on new applications. E-MRS Strasbourg Conferences : (Symposia)Spring Meeting (- doesn't melt, won't dissolve, just can't be broken downlet's send it to ADVANCED MATERIALS!

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Solution photochemistry of poly(dialkylsilanes): a new class of photoresists

Abstract: Abstract

Cited by 80 publications

References 0 publications

Oxygen-crosslinked polysilane: the new class of Si-related material for electroluminescent devices

Oxygen-crosslinked polysilane: the new class of Si-related material for electroluminescent devices

Gauche, Ortho, Transoid andAnti Conformations of the Tetrasilanes SiMe3SiX2SiX2SiMe3 (X=H, F, Cl, Br, I): A Computational and Vibrational Spectroscopic Study

Polysilanes—a new look at some old materials

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