Metal-non-metal transition in silver chalcogenides

Junod, P.; Hediger, H.; Kilchör, B.; Wullschleger, Jürg

doi:10.1080/14786437708239769

Cited by 176 publications

(98 citation statements)

References 26 publications

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“…The standard enthalpy of electron-hole formation corresponds satisfactorily to the band gap of a-silver selenide. Junod et al [9] determined the band gap of a-silver selenide at 20 jC as 0.15 eV and found that the gap increases with increasing temperature. This and the magnitude of our experimental values correspond to this prediction.…”

Section: Resultsmentioning

confidence: 99%

Coulometric titration at low temperatures—nonstoichiometric silver selenide

Beck

Janek

2004

Solid State Ionics

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A modified coulometric titration technique is described for the investigation of nonstoichiometric phases at low temperatures. It allows to obtain titration curves at temperatures where the conventional coulometric titration technique fails because of too small chemical diffusion coefficients of the mobile component. This method for indirect coulometric titration is applied to silver selenide between À 100 and 100 jC. The titration curves are analyzed on the basis of a defect chemical model and provide thermodynamic data of the a-silver selenide phase. The boundaries of the homogeneous phase field are determined. D

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Section: Resultsmentioning

confidence: 99%

Coulometric titration at low temperatures—nonstoichiometric silver selenide

Beck

Janek

2004

Solid State Ionics

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“…For b-Ag 2 Se, the energy gap ranges from about 0.045 to 0.11 eV [3,4,23,24]. The transport measurements reported by Xu.…”

Section: Discussionmentioning

confidence: 99%

Ab initio band structure calculations of the low-temperature phases of Ag2Se, Ag2Te and Ag3AuSe2

Fang

Groot

Wiegers

2002

Journal of Physics and Chemistry of Solids

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“…For Ag 2 S we find that E g ¼ (1.06 AE 0.2) eV, in good agreement with literature values for the corresponding bulk material. [13,14] Note that close to the bandgap a model independent linear extrapolation derived using a Taylor expansion of Equation 1 can also be used to obtain an approximate value for E g . Even more compelling is to consider examples from an enormous variety of semiconductors whose quirks can provide a signature of bulk properties in a colloidal material.…”

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Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems

et al. 2008

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Semiconductor nanocrystals (NCs) are colloidal single crystals that have been widely examined in recent years to elucidate the origins and applications of size-tunable properties. Size-tunable optical properties are particularly desirable for applications in light-emitting devices, lasers, and biological labeling. [1][2][3][4][5] Strong confinement effects, characteristic of many NCs (''quantum dots''), give them an electronic structure more like molecules than semiconductors and this is of special interest in areas such as quantum information.[6] However, while all colloidal quantum dots are NCs, not all NCs are colloidal quantum dots. This distinction between bulk and confined nanocrystals is not always obvious depending on the characteristics of the bulk band structure. In this paper we show that the optical spectra of bulk semiconductor NCs can exhibit surprising features that may be confused with quantum confinement effects. We compare the optical properties of two bulk nanocrystal systems, Ag 2 S and EuS.Bulk semiconductors have revolutionized a breadth of technologies as a consequence of the way electronic levels form delocalized bands. Although the development of new quantum dot systems have dominated semiconductor nanocrystal research, we suggest that the field of bulk NC synthesis and characterization is complementary to the well-established field of quantum-confined NCs, and offers great potential for the discovery of materials that exploit the desirable electronic and magnetic attributes of bulk semiconductors on the nanoscale. A key advantage foreseen for these NCs is that they are easily processed and they can potentially be programmed for intelligent self-assembly. [7] The realization of the scope and potential of nanoscience has stimulated the discovery of many routes for semiconductor quantum dot synthesis. Many of these reports seek to demonstrate quantum-confinement effects; that is, size-tunable absorption features as demonstrated in compelling pioneering work. [8,9] Compared to the extensive amount of research directed towards creating novel quantum dot systems, little work has been directed towards thinking about the potential of colloidal synthesis for the miniaturization of semiconductors while retaining the essential attributes of the bulk material. There are some notable exceptions to this including nanocrystalline TiO 2 which has been extensively studied for use in photovoltaics.[10] Bulk semiconductors have been, and continue to be, essential components in almost all aspects of technology. They differ from quantum-confined semiconductors in that carriers are located in bands rather than discrete energy levels, thus producing the well-known electronic properties. Nanocrystals that have these same properties could potentially find wide application in micro-and nanoelectronics because they may facilitate processing of devices on small length scales without introducing complicating quantum effects. These materials would exploit the advantages of nanocrystals, such as enhanced processabilit...

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Metal-non-metal transition in silver chalcogenides

Cited by 176 publications

References 26 publications

Coulometric titration at low temperatures—nonstoichiometric silver selenide

Coulometric titration at low temperatures—nonstoichiometric silver selenide

Ab initio band structure calculations of the low-temperature phases of Ag2Se, Ag2Te and Ag3AuSe2

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems

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Metal-non-metal transition in silver chalcogenides

Cited by 176 publications

References 26 publications

Coulometric titration at low temperatures—nonstoichiometric silver selenide

Coulometric titration at low temperatures—nonstoichiometric silver selenide

Ab initio band structure calculations of the low-temperature phases of Ag2Se, Ag2Te and Ag3AuSe2

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag2S and EuS Nanocrystalline Systems

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Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems