Optical Properties of Cylindrite

Sturm, Chris; Schmidt‐Grund, Rüdiger; Kaden, Ronny; Wenckstern, Holger von; Rheinländer, B.; Bente, K.; Grundmann, Marius

doi:10.1063/1.2730468

Cited by 3 publications

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“…For a lamella of composition Fe 0.7 Sn 4.64 Pb 2.76 Sb 1.9 S 14 four critical points appear within the spectrum that can be correlated to band transitions at E 0 = 1.15 eV, E 1 = 2.25 eV, E 1 + Δ = 2.7 eV, E 2 = 3.3 eV, respectively. Optical anisotropy within the (100) plane was found to be negligible 64. As the existence of these points proves cylindrite to be a semiconductor, E 0 represents the optical band gap energy E g .…”

Section: The Physical Propertiesmentioning

confidence: 95%

“…Therefore, cylindrite belongs to the group of narrow band gap semiconductors. From optical ellipsometry the model dielectric function 〈 ε 〉 = 〈 ε 1 〉 + i 〈 ε 2 〉 could be determined for the (100) plane of a synthetic lamellae and is reported elsewhere 64. ε 1 corresponds to the reflectivity and ε 2 means absorption.…”

Section: The Physical Propertiesmentioning

confidence: 99%

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Synthesis and physical properties of cylindrite micro tubes and lamellae

Kaden

Wagner

Sturm

et al. 2010

Physica Status Solidi (b)

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The natural semiconductor cylindrite FeSn 4 Pb 3 Sb 2 S 14 was synthesised by chemical vapour transport (CVT). Crystals with lamellar shape and cylindrical morphology could be deposited on substrates. The endothermic reactions responsible for material transport were simulated by means of thermodynamic modelling. Cylindrite belongs to the class of misfit layered compounds, where its modulated incommensurate crystal structure is based on the regular alternation of two types of layers. The so called T-and H-slab are incommensurately linked. Determined from single crystal XRD measurements, the modulation of atom positions as well as modulation of metal site occupancy of both subsystems are presented. The origin of super structure reflections found in scattering experiments can be clearly explained by a structure model. Based on experimentally determined single crystal XRD data and HRTEM inspections a model is derived to explain the formation of cylindrical architecture of crystals. The specific electrical conductivity of cylindrite improves from 10 TEM bright field image of high magnification demonstrating the continuous bending of (100) layers in a cylindrite cylinder.

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Section: The Physical Propertiesmentioning

confidence: 95%

Section: The Physical Propertiesmentioning

confidence: 99%

Synthesis and physical properties of cylindrite micro tubes and lamellae

Kaden

Wagner

Sturm

et al. 2010

Physica Status Solidi (b)

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“…Also synthetic boulangerite (Pb 5 Sb 4 S 11 ) wires with diameters ranging from 100 to 500 nm and lengths up to 100 mm were crystallized from the melt [33]. The optical properties of cylindrite have been investigated [34].…”

Section: Cylindrical Tubesmentioning

confidence: 99%

Architecture of nano‐ and microdimensional building blocks

Grundmann¹

2010

Physica Status Solidi (b)

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The architecture of nano-and microdimensional building blocks has been investigated within the research group FOR 522 funded by the Deutsche Forschungsgemeinschaft. The main results are summarized in a series of papers following this article. Nanowires have been investigated for III-V-and II-VIsemiconductors and thermoelectric materials. Structures with curvature -screws, spirals, cylindrical tubes, and scrolls -have been achieved using substrate rotation during material deposition under glancing angle and employing strain, either between lattice planes in incommensurable structures or due to lattice mismatch in epitaxial heterostructures. The modification of physical properties due to conformal coverage with thin films, quantum wells, and dielectric Bragg mirrors has been investigated.Schematic geometry of various investigated structures: Nanowires (GaAs, InAs, GaN, ZnO, Bi 2 Te 3 ), spirals (silicon), tubes (cylindrite, a sulfosalt, FePb 3 Sn 4 Sb 2 S 14 ), and scrolls (InGaAs/BGaAs/GaAs), from left to right.

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Progress in sulfosalt research

Dittrich

Stadler

Topa

et al. 2009

Physica Status Solidi (a)

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An overview over the progress in sulfosalts research is given, including basic and application oriented research work. The ternary and multinary compound semiconductor family is defined. The chemical composition possibilities are given as well as an introduction to the structural systematics. The peculiarities of the complex crystal structures are outlined. The main characteristics of thermodynamic properties are given exemplarily by the SnS–Sb2S3 pseudo‐binary phase diagram. A new phase in the Sn–Sb–S system, SnSb4S7, is reported and the new crystal structure is shown. The published methods of synthesis, thin film deposition, and nanoparticle preparation are listed in tables. A detailed listing of different methods, used for sulfosalt thin film deposition is presented. Data of physical properties are collected and presented. A compilation of measured bandgaps is given. The potential of sulfosalts in possible applications and the role in actual applications are widespread. They include photovoltaic (thin film solar cells) and thermoelectric energy conversion (thermoelectric generator, Peltier elements), phase change memory (rewritable compact discs), catalysis, X‐Ray detectors, and cryoelectronics. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Optical Properties of Cylindrite

Cited by 3 publications

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Synthesis and physical properties of cylindrite micro tubes and lamellae

Synthesis and physical properties of cylindrite micro tubes and lamellae

Architecture of nano‐ and microdimensional building blocks

Progress in sulfosalt research

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