The Effect of Alloying on the Bandgap Energy of Nanoscaled Semiconductor Alloys

Zhu, Yong; Lang, Xing You; Jiang, Q.

doi:10.1002/adfm.200700857

Cited by 52 publications

(38 citation statements)

References 54 publications

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“…Regulacio et al pointed out that experimental research on band gap engineering via control of nanocrystal composition is still in its infancy. 6 On theoretical aspect, Zhu et al 7 developed a relationship between the band gap and the alloy composition based on the V egard's law. However, their equation contains a solid-vapor transition entropy which is difficult to determine.…”

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confidence: 99%

Band gap prediction for composition-tunable alloyed semiconductor nanocrystals

Gao

2013

Applied Physics Letters

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Size and composition-dependences of band gap energies are important properties for nanocrystal semiconductors, and have attracted extensive attentions for the last two decades. In this letter, a simple method of band gap prediction for nanocrystal alloys is developed. The band gaps of II–VI semiconductor homogeneous alloys with zinc blende and wurtzite structure, such as zb-(ZnS)x(CdS)1−x, zb-(CdS)x(CdSe)1−x, zb-(ZnSe)x(CdSe)1−x, w-(ZnS)x(CdS)1−x, w-(ZnSe)x(CdSe)1−x, and w-(CdSe)x(CdTe)1−x nanocrystal alloys, are calculated. The calculated results are in good agreement with the available experimental data. It provides insights into the effects of structure, size, and composition on the band gap.

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confidence: 99%

Band gap prediction for composition-tunable alloyed semiconductor nanocrystals

Gao

2013

Applied Physics Letters

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“…is the bond energy of bulk, 0 ( ) D x is the critical diameter of the alloying nanocrystals, which equals to 6h (here h denotes the bond length of two elements) for nanoparticle [17]. Thus, the interatomic interaction decreases as the size declines and that can be neglected while the size decreases to nanoscale, which is similar to the ideal solution.…”

Section: Theory Modelmentioning

confidence: 69%

Size and composition dependence of melting temperature of binary nanoparticles

Liao

Xie

et al. 2011

Sci. China Phys. Mech. Astron.

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Based on the ideal solution approximation, the model for size-dependent melting temperature of pure metal nanoparticles is extended to binary alloy systems. The developed model, free of any adjustable parameter, demonstrates that the melting temperature is related to the size and composition of alloy nanoparticles. The melting temperature of CuNi, PbBi and SnIn binary alloy nanocrystals is found to be consistent with the experiments and molecular dynamics simulations. The research reveals that alloy nanocrystals have similar melting nature as pure metal. nano binary alloy, melting temperature, size-dependent PACS: 64.70.dj Nanoparticles play an important role in understanding the transition from microscopic particles to macroscopic particles. As the material dimensions reduce to the nanoscale, they exhibit a lot of unique thermodynamic properties. The decrease in melting temperature of metal particles with the reduction of their size, since firstly reported by Pawlow [1], has been found theoretically and experimentally [2]. Owing to the high surface to volume ratio for small particles and the lower coordination number of the surface atoms, the melting point decreases with the reduction of its size.While more and more applications have been found for low dimensional materials in modern industries [3], phase stability of nanostructures has been one of the central issues in nanoscience and nanotechnology. It is believed that understanding of the melting temperature of the low dimensional solids is beneficial to the theoretical exploitation of phase transition and applications in modern industries. On the other hand, the material performance, such as the mechanical, physical and chemical performance, is a function of the ratio of working temperature to melting temperature. Generally, at room temperature, the function is neglected because it is a constant. However, when the working temperature is not at room temperature, the function will become an important parameter. In this respect, nanomaterial is the same as the bulk material. That the melting temperature of nanomaterial decreases with the reduction of their size is equal to elevate the working temperature and that will affect the performance of the material [4].

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“…219 In some cases, alloys have optical properties unrelated to the parent material: for example, when preparing an alloy of CdSe and CdTe, the effective mass of the excitons of both parent materials need to be considered. In the case of CdTe, the effective exciton mass is substantially lower than that of CdSe.…”

Section: Alloysmentioning

confidence: 99%

The Preparation of II–VI Semiconductor Nanomaterials

2014

Semiconductor Quantum Dots

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Although nanoparticles (notably metals) can be traced to antiquity, the origins of modern semiconductor quantum dots (QDs) is a much later development. Specic advances in quantum-conned semiconductor particles can be traced to Grätzel, 1 who reported the synthesis of colloidal CdS to examine photo-corrosion, and Brus 2 who notably reported the band edge luminescence of the same material. At approximately the same time, Ekimov reported quantum connement in CuCl prepared in a silica glass, 3,4 while Henglein, an early pioneer of colloidal semiconductors, reported the synthesis of CdS on colloidal SiO 2 . 5 Fendler then reported the use of a reverse micelle to prepare CdS nanoparticles, 6 which was importantly improved on by Henglein, who used polyphosphates as a well-dened passivating agent, allowing nanoparticles to be processed and redispersed. 7The work described above utilised mainly inorganic salts as precursors in aqueous-based reactions. Consequently, the low temperatures used and the presence of air and water oen resulted in polydispersed materials with relatively poor optical and crystalline properties. The small number of available suitable precursors also reduced the number of systems that could be explored. The need to improve these reactions by removing air and water dictated the use of organic-based starting materials; however, inorganic reagents such as Na 2 Se could not easily be used in organic solvents so alternatives were required.Independently, Steigerwald pioneered many of the early chemical routes to bulk solid-state materials, 8 inspired by the early work on the deposition of

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The Effect of Alloying on the Bandgap Energy of Nanoscaled Semiconductor Alloys

Cited by 52 publications

References 54 publications

Band gap prediction for composition-tunable alloyed semiconductor nanocrystals

Band gap prediction for composition-tunable alloyed semiconductor nanocrystals

Size and composition dependence of melting temperature of binary nanoparticles

The Preparation of II–VI Semiconductor Nanomaterials

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