Increasing the Mn doping level in semiconductor nanocrystals by sol–gel auto-combustion method

Jiang, Yao-Hui; Lan, Changyong; Yang, Sen; Yang, Shengchun

doi:10.1016/j.matlet.2012.08.128

Cited by 3 publications

(14 citation statements)

References 13 publications

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“…Cu atoms occupy different sites in the Cu 6 Sn 5 compound, that is four atoms occupy two different 8f sites, and the other two occupy 4a and 4e sites, respectively. For (Cu,Pd) 6 Sn 5 phases, the additions can be either interstitial or substitutional in nature. There is no data about the specific structure of (Cu,Pd) 6 Sn 5 .…”

Section: Model and Methodsmentioning

confidence: 99%

“…It is known that material performance could be improved by doping [6]. There are many studies on the effect of Pd addition on the reliability and interfacial reactions [7].…”

Section: Introductionmentioning

confidence: 99%

“…There are many studies on the effect of Pd addition on the reliability and interfacial reactions [7]. It has been found * E-mail: qduswq@163.com that a thin (Cu,Pd) 6 Sn 5 IMC layer is beneficial in effective reducing inter-diffusion between a Cu substrate and the solder, and, consequently, in the growth of the IMC layer and the EM (electromigration) processes [8]. Regarding the structure of the Cu-Pd-Sn IMC many researchers have found that the (Cu,Pd) 6 Sn 5 has a similar crystal structure as Cu 6 Sn 5 [7,8], in which Pd atoms occupy the Cu atom sub-lattice.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the structure of the Cu-Pd-Sn IMC many researchers have found that the (Cu,Pd) 6 Sn 5 has a similar crystal structure as Cu 6 Sn 5 [7,8], in which Pd atoms occupy the Cu atom sub-lattice. However, the role of Pd in (Cu,Pd) 6 Sn 5 IMC has not been fully understood up to now. Works in this area include atomiclevel simulations based on density-functional theory (DFT) to study the effects of Zn or Co substitution on the properties of Cu 6 Sn 5 [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a lower Pd concentration (around 1.68 at.%) in the (Cu,Pd) 6 Sn 5 has been found in experimental works [7,8], but it has not been studied theoretically. This paper is devoted to address these issues by exploring the thermodynamic and electronic structure properties of (Cu,Pd) 6 Sn 5 .…”

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confidence: 99%

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First-principles investigation of the structural stability and electronic properties of Pd doped monoclinic Cu6Sn5 intermetallic compounds

Shao¹,

Chen³

2014

Materials Science-Poland

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Tri-layer Au/Pd/Ni(P) films have been widely used as surface finish over the Cu pads in high-end packaging applications. It was found that a thin (Cu,Pd) 6 Sn 5 IMC layer was beneficial in effective reducing inter-diffusion between a Cu substrate and a solder, and therefore the growth of the IMC layer and the EM (electromigration) processes. In this study, the structural properties and phase stability of monoclinic Cu 6 Sn 5 -based structures with Pd substitutions were studied by using the firstprinciples method. The (Cu,Pd) 6 Sn 5 structure with the 4e site substituted by Pd has the lowest heat of formation and is the most stable among (Cu,Pd) 6 Sn 5 structures. Hybridization of Pd-d and Sn-p states is a dominant factor for stability improvement. Moreover, Pd atoms concentration corresponding to the most stable structure of (Cu,Pd) 6 Sn 5 was found to be 1.69 %, which is consistent with the experimental results.

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Section: Model and Methodsmentioning

confidence: 99%

“…It is known that material performance could be improved by doping [6]. There are many studies on the effect of Pd addition on the reliability and interfacial reactions [7].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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First-principles investigation of the structural stability and electronic properties of Pd doped monoclinic Cu6Sn5 intermetallic compounds

Shao¹,

Chen³

2014

Materials Science-Poland

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Study of the Zn occupancy leading to the stability improvement for Cu6Sn5 using a first-principles approach

Shao

et al. 2013

Materials Letters

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Progress in sol-gel autocombustion synthesis of metals and alloys

Zhang¹,

Zheng-He²,

Yu-Wen³

et al. 2015

Acta Phys. Sin.

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This paper is an overview of the progress of sol-gel autocombustion synthesis of metals and metal alloys. Sol-gel is a convenient method to synthesize a variety of oxides by mixing of different elements at an atomic level. Autocombustion synthesis is a self-sustaining process caused by the heat generated from its exothermic reaction. By combining these two methods, the sol-gel autocombustion method is introduced in the synthesis of metals and metal alloys. The experimental principle and technological route are introduced in detail in this review. By using metal nitrate, citric acid etc. as starting materials, the dried gels are prepared through sol-gel routine. Under the protection of inert gas, the autocombustion could be activated at low temperature in a tube furnace. After the autocombustion was activated, the gel burned violently, and a large amount of white gas was refleased. During heating the gel, mass spectrum shows that the H2, CO and CH4 areflevidently identified near the combustion temperature. They are well known reducing agents, which can be used in the redox reaction for synthesizing metals from oxides. Based on the data obtained from the TG-DTA and mass spectrum analysis, it is speculated that there are mainly five reactions appearing during the burning of the gel at high temperature: exothermic reaction between fuel and oxidant; metal oxide(s) formation by decomposition of the nitrate(s); generation of CH4, CO and H2 by the decomposition of CHx containing groups of complexing agent; exothermic reaction between CH4/CO/H2 and oxidant; the reduction of metals from their corresponding metal oxides by CH4 and H2 in nascent product. The application of this method to the synthesis of metals and metal alloys is shown by realized examples. This method shows many advantages in the synthesis of metals, such as simple apparatus, inexpensive raw materials, a relatively simple preparation process, and fine powder products with high homogeneity. Moreover, very low temperature is required to activate the reaction, and then the combustion can continue to take place without needing additional energy supply. This method has potential applications in experimental material reflearches.

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Increasing the Mn doping level in semiconductor nanocrystals by sol–gel auto-combustion method

Cited by 3 publications

References 13 publications

First-principles investigation of the structural stability and electronic properties of Pd doped monoclinic Cu6Sn5 intermetallic compounds

First-principles investigation of the structural stability and electronic properties of Pd doped monoclinic Cu6Sn5 intermetallic compounds

Study of the Zn occupancy leading to the stability improvement for Cu6Sn5 using a first-principles approach

Progress in sol-gel autocombustion synthesis of metals and alloys

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