High quality p-type ZnO film growth by a simple method and its properties

In this paper, a simple method is reported to obtain nitrogen-doped p-ZnO film. In this method NH3plasma, generated in a plasma-enhanced chemical vapor deposition system, was employed to treat ZnO thin film. By hall-effect measurement a p type conductivity was observed for the treated film with the hole density of 3.6×1016. XPS result confirmed nitrogen was incorporated into ZnO film during the treatment process to occupy the oxygen positions.

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High quality p-type ZnO film grown on ZnO substrate by nitrogen and tellurium co-doping

MRS Proceedings ◽

10.1557/proc-1201-h05-25 ◽

2009 ◽

Vol 1201 ◽

Author(s):

Seunghwan Park ◽

Tsutomu Minegishi ◽

jinsub Park ◽

Hyunjae Lee ◽

Toshinori Taishi ◽

...

Keyword(s):

Electron Concentration ◽

Hole Concentration ◽

Nitrogen Concentration ◽

Zno Film ◽

Acceptor Pair ◽

High Quality ◽

Co Doping ◽

Donor Acceptor ◽

Doped Zno ◽

P Type

AbstractNitrogen and tellurium co-doped ZnO (ZnO:[N+Te]) films have been grown on (0001) ZnO substrate by plasma-assisted molecular beam epitaxy. The electron concentration of tellurium doped ZnO (ZnO:Te) gradually increases, compared that of undoped ZnO (u-ZnO). On the other hand, conductivity of ZnO:[N+Te] changes from n-type to p-type characteristic with a hole concentration of 4×1016 cm-3. However, nitrogen doped ZnO film (ZnO:N) still remain as n-type conductivity with a electron concentration of 2.5×1017 cm-3. Secondary ion mass spectroscopy reveals that nitrogen concentration ([N]) of ZnO:[N+Te] film (2×1021 cm-3) is relatively higher than that of ZnO:N film (3×1020 cm-3). 10 K photoluminescence spectra shows that considerable improvement of emission properties of ZnO:[N+Te] with an emergence of narrow acceptor bound exciton (A°X, 3.359 eV) and donor-acceptor pair (DAP, 3.217 eV), compared with those of u-ZnO. Consequently, high quality p-type ZnO with high N concentration is realized by using Te and N co-doping technique due to reduction of Madelung energy.

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ZnSe and ZnO film growth by pulsed-laser deposition

Applied Surface Science ◽

10.1016/s0169-4332(97)00681-8 ◽

1998 ◽

Vol 127-129 ◽

pp. 496-499 ◽

Cited By ~ 30

Author(s):

Y.R. Ryu ◽

S. Zhu ◽

S.W. Han ◽

H.W. White ◽

P.F. Miceli ◽

...

Keyword(s):

Pulsed Laser Deposition ◽

Film Growth ◽

Pulsed Laser ◽

Laser Deposition ◽

Zno Film

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A buffer layer for ZnO film growth on sapphire

Surface Science ◽

10.1016/j.susc.2008.06.011 ◽

2008 ◽

Vol 602 (14) ◽

pp. 2600-2603 ◽

Cited By ~ 9

Author(s):

Kefei Zheng ◽

Qinlin Guo ◽

E.G. Wang

Keyword(s):

Buffer Layer ◽

Film Growth ◽

Zno Film

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New outlooks on bunched beam instabilities in particle accelerators. A proposal for a simple method to release a potential self-consistent high quality beam

Proceedings of International Conference on Particle Accelerators ◽

10.1109/pac.1993.309766 ◽

2002 ◽

Cited By ~ 1

Author(s):

M. Bergher

Keyword(s):

Particle Accelerators ◽

High Quality ◽

Simple Method ◽

Self Consistent ◽

Beam Instabilities

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Exploring the Impact of Early Decisions in Variable Ordering for Constraint Satisfaction Problems

Computational Intelligence and Neuroscience ◽

10.1155/2018/6103726 ◽

2018 ◽

Vol 2018 ◽

pp. 1-14

Author(s):

José Carlos Ortiz-Bayliss ◽

Ivan Amaya ◽

Santiago Enrique Conant-Pablos ◽

Hugo Terashima-Marín

Keyword(s):

Constraint Satisfaction ◽

Constraint Satisfaction Problems ◽

Search Cost ◽

High Quality ◽

Simple Method ◽

Variable Ordering ◽

It Performance ◽

The Cost ◽

The Impact ◽

Variable Ordering Heuristics

When solving constraint satisfaction problems (CSPs), it is a common practice to rely on heuristics to decide which variable should be instantiated at each stage of the search. But, this ordering influences the search cost. Even so, and to the best of our knowledge, no earlier work has dealt with how first variable orderings affect the overall cost. In this paper, we explore the cost of finding high-quality orderings of variables within constraint satisfaction problems. We also study differences among the orderings produced by some commonly used heuristics and the way bad first decisions affect the search cost. One of the most important findings of this work confirms the paramount importance of first decisions. Another one is the evidence that many of the existing variable ordering heuristics fail to appropriately select the first variable to instantiate. Another one is the evidence that many of the existing variable ordering heuristics fail to appropriately select the first variable to instantiate. We propose a simple method to improve early decisions of heuristics. By using it, performance of heuristics increases.

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