203 research outputs found
Carbon-related defects in Si:C/silicon heterostructures assessed by deep-level transient spectroscopy
This paper reports on a Deep-Level Transient Spectroscopy (DLTS) study of the electrically active defects in similar to 100 nm Si: C stressors, formed by chemical vapor deposition on p-type Czochralski silicon substrates. In addition, the impact of a post-deposition Rapid Thermal Annealing (RTA) at 850 degrees C on the DLT-spectra is investigated. It is shown that close to the surface at least two types of hole traps are present: one kind exhibiting slow hole capture, which may have a partial extended defect nature and a second type of hole trap behaving like a point defect. RTA increases the concentration of both hole traps and, in addition, introduces a point defect at EV + 0.35 eV in the depletion region of the silicon substrate at some distance from the Si: C epi layer. This level most likely corresponds with CiOi-related centers. Finally, a negative feature is found systematically for larger reverse bias pulses, which could point to a response of trap states at the Si: C/silicon hetero-interface
N-(2-Formylphenyl)benzenesulfonamide
In the title compound, C13H11NO3S, the two aromatic rings are oriented at an angle of 88.18 (8)°. Intramolecular N—H⋯O and C—H⋯O hydrogen bonds are observed, each of which generates an S(6) ring motif. In the crystal, molecules are linked into C(7) chains along [010] by intermolecular C—H⋯O hydrogen bonds. The structure is further stabilized by intermolecular C—H⋯π interactions involving the sulfonyl-bound phenyl ring
Diethyl 2-(2-nitrobenzylidene)malonate
In the title compound, C14H15NO6, the ethoxycarbonyl groups adopt extended conformations. In the crystal, molecules are linked into centrosymmetric dimers via pairs of C—H⋯O hydrogen bonds with a R
2
2(20) motif
2-Chloromethyl-3-methyl-1-phenylsulfonyl-1H-indole
In the title compound, C16H14ClNO2S, the phenyl ring makes a dihedral angle of 78.1 (1)° with the indole ring system. The molecular structure is stabilized by weak intramolecular C—H⋯O interactions. The crystal structure exhibits weak intermolecular C—H⋯O, C—H⋯π and π–π [centroid–centroid distances = 3.620 (1)–3.794 (1) Å] interactions
N-[(3-Phenylsulfanyl-1-phenylsulfonyl-1H-indol-2-yl)methyl]propionamide
In the title compound, C24H22N2O3S2, the phenyl rings form dihedral angles of 75.2 (1) and 86.1 (1)° with the indole ring system. The molecular structure is stabilized by intramolecular C–H⋯O and N—H⋯O hydrogen bonds. The crystal structure exhibit intermolecular N—H⋯O and C—H⋯O hydrogen bonds, C—H⋯π and π–π [centroid–centroid distance = 3.748 (1) Å] interactions
(2-Methyl-1-phenylsulfonyl-1H-indol-3-yl)phenylmethyl acetate
In the title compound, C24H21NO4S, the indole ring system makes dihedral angles of 77.8 (1) and 85.4 (1)°, respectively, with the S- and C-bound phenyl rings. The molecular structure is stabilized by a weak intramolecular C—H⋯O hydrogen bond. In the crystal, a weak intermolecular C—H⋯O hydrogen bond and a C—H⋯π interaction are also observed
1,3-Dimethyl-5-(2-methylbenzylidene)pyrimidine-2,4,6(1H,3H,5H)-trione
In the title compound, C14H14N2O3, the dihedral angle between the pyrimidine and benzene rings is 14.9 (1)°. The molecular structure is stabilized by weak intramolecular C—H⋯O interactions and the crystal structure exhibits a weak intermolecular π–π interaction [centroid–centroid distance = 3.575 (3) Å]
(4-Bromophenyl)(1-phenylsulfonyl-1H-indol-2-yl)methanone
In the title compound, C21H14BrNO3S, the indole ring system forms dihedral angles of 65.64 (8) and 59.30 (8)°, respectively, with the phenyl and bromophenyl rings. In the crystal, molecules are connected by a C—H⋯O hydrogen bond, forming a chain along [101]. The chains are further connected by weak intermolecular C—H⋯π interactions, forming a layer parallel to the ac plane
5-Methylphenanthro[2,3-b]thiophene
The title compound, C17H12S, which crystallises with two molecules in the asymmetric unit, features four fused rings forming an essentially planar molecule, with maximum deviations from the mean plane of 0.078 (2) and 0.080 (2) Å for C atoms of the thiophene and phenanthrene groups in both the molecules. The crystal packing features weak C—H⋯π interactions
tert-Butyl 3-[2,2-bis(ethoxycarbonyl)vinyl]-2-bromomethyl-1H-indole-1-carboxylate
In the title compound, C22H26BrNO6, the indole ring system is planar [maximum deviation 0.029 (2) Å]. The tert-butyl bound carboxylate group forms a dihedral angle of 17.54 (8)° with the indole ring system. In the crystal, molecules are linked into centrosymmetric R
2
2(10) dimers by paired C—H⋯O hydrogen bonds
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