Research in Electrical property of CdxZn1-xTe II-VI Ternary Semiconductor

Abstract: An essential issue in developing semiconductor devices for photovoltaic and thermo electric is to design materials with appropriate band gaps plus the proper positioning of do pant levels relative to the bands. Ternary Semiconductor alloys provide a natural means of tuning the magnitude of the forbidden gap for wide Application of Semiconductor devices. The need to provide materials for applications in the long-wavelength range for infrared detectors has led to the development of II-VI Ternary alloys of CdxZn1-xTe Ternary Semiconductor. CdxZn1-xTe II-VI Ternary semiconductor is very important as an x of a constituent in the semiconductor is going to have significant changes in calculating Physical Property like Band Energy Gap. These Ternary Compounds can be derived from binary compounds CdTe and ZnTe by replacing one half of the atoms in one sub lattice by lower valence atoms, the other half by higher valence atoms and maintaining average number of valence electrons per atom. The subscript X refers to the alloy content or concentration of the material, which describes proportion of the material added and replaced by alloy material. This paper represents the CdxZn1-xTe II-VI Ternary Semiconductor Band Energy Gap values. Our results agree well with the Available data in the literature.

Keywords: Alloys, Band Energy Gap, Band Gap Engineering, Binary Semiconductors, Composition, Cadmium, Conductance, Doping, Electronic properties, Electrical, Ternary Semiconductors, Telluride, Zinc. PACS codes: 81. 81.05Ea, 81. 72.20.-I, 61.72.uf, 61.72.uj

Introduction: 1) In the present work, the solid solutions belonging to CdxZn1-xTe II-VI Ternary Semiconductor Band Energy Gap have been investigated. Doping of Cd component in a Binary semiconductor like ZnTe and changing the composition of do pant has actually resulted in lowering of Band Energy Gap. Thus effect of do pant increases the conductivity and decreases the Band Energy Gap and finds extensive applications. The present investigation relates Band Energy Gap and Electro Negativity with variation of composition for CdxZn1-xTe II-VI Ternary Semiconductor. The fair agreement between calculated and reported values of Band Energy Gaps

Of CdTe and ZnTe Binary semiconductors give further extension of Band Energy Gaps for Ternary semiconductors. The present work opens new line of approach to Band Energy Gap studies in CdxZn1-xTe II-VI Ternary Semiconductor. Recently much attention is paid to the study of Ternary Semiconductor materials and their Alloys for Application in design of Hetero structures. The important of all physical properties of these compounds are currently moving in to focus. Application of these Ternary Semiconductor materials in Optical devices has high experimental level of investigation. More attention is paid to the study of these compounds including Cadmium, Zinc of II Group and Te from VI Group. CdxZn1-xTe is most Important Ternary Semiconductor material with Arbitrary alloy between CdTe and ZnTe with Cd Composition ranging between 0 Of conductivity. The materials chosen as suitable do pants depend on the atomic properties of both the do pant and the material to be doped. In general varying Concentration that produce the desired controlled changes are classified as either electron acceptors or donors. Semiconductor alloys are made of elements from group II and group VI on the periodic table such as that is commonly used to interact with light in typical optical devices. CdxZn1-xTe ternary phosphates are potentially useful for opto electronic device applications. CdxZn1-xTe is a wide band-gap alloy that is often employed in red light emitting diodes (LEDs) [1, 2]. CdxZn1-xTe is useful material for long-wavelength surface emitting lasers [3]. Although some experimental and theoretical investigations have been reported on the band-structure parameters for II-VI crystalline phases with zinc-blend structure [4, 5] many fundamental properties of these materials remain to be determined precisely. Today, the production and the use of II-VI with technological devices with added as become more important gradually, increase more and more. Experimental studies on such type of produced semiconductor alloys are carried out intensively. This study was carried out to shed light on the future studies of scientists who experimentally prepare and test these alloys in laboratories to help them in determining the change in amounts of additives in Semiconductor alloys are made of elements from group II and group VI on the periodic table such as that is commonly used to interact with light in typical optical devices. CdxZn1-xTe ternary phosphates are potentially useful for opto electronic device applications. CdxZn1-xTe is a wide band-gap alloy that is often employed in red light emitting diodes (LEDs) [1, 2]. CdxZn1-xTe Useful material for long-wavelength surface emitting lasers [3]. Although some experimental and theoretical investigations have been reported on the band-structure parameters for II-VI crystalline phases with zinc-blend Structure [4, 5] many fundamental properties of these materials remain to be determined precisely. Today, the Production and the use of Ternary Semiconductors with technological devices with added Cd become more important gradually, Increase more and more. Experimental studies on such type of produced semiconductor alloys are carried out Intensively. This study was carried out to shed light on the future studies of scientists who experimentally prepare and test these alloys in laboratories to help them in determining the change in amounts of additives in alloys, and to determine the accordance of theoretical studies with experiments and other theoretical works. In the end, features of new semiconductor alloys that may be obtained by adding Cd to ZnTe structure at various ratios were examined. In this study, electronic and optical properties of CdxZn1-xTe alloys for

X values 0 0.3 0.4 0.5 0.6 were calculated as a function of as composition. Obtained results were found in good agreement compared with experimental and theoretical data in literature. We have considered CdxZn1-xTe ternary alloys as having cubic symmetry in our calculation for all the five systems to maintain Consistency and simplicity. We expect that for x = 0.5 the alloy is a layered structure and should be non-cubic. We have taken four layers and hence a cubic unit cell for x = 0.3, 0.40, 0.5 we have replaced one, two and Three as atoms, respectively, by in to get the desired concentration of theoretical and experimental data [5, 12-14]. The band profiles and band gap values are in good agreement with the earlier theoretical works. The band gaps are smaller than the experimental values. The layout of this paper is given as followings:

Objective: The main Objective of this paper is to calculate CdxZn1-xTe II-VI Ternary Semiconductor Band Energy Gap values Theoretical Impact: The following relation calculates band Energy Gap of CdxZn1-xTe Eg (CdxZn1-xTe)=x* Eg (CdTe)+1-x*Eg (ZnTe)+SQRT (Eg (CdTe)* Eg (ZnTe)*x*1-x

Where: Eg=Band Energy Gap X=Cd Composition.

Additivity:

Eg (CdxZn1-xTe)=X*Eg (CdTe)+X* Eg (ZnTe).

Where: Eg=Band Energy Gap X=Cd Composition

Cd Composition ranges: 0.0 0.30 0.40 0.50 0.60 Compound CdxZn1-xTe Cd values 0 0.3 0.4 0.5 0.6 1-X Values 1 0.7 0.6 0.5 0.4 Ter Eg 2.26 2.39 2.36 2.3 2.201 Additivity 2.26 2.01 1.93 1.85 1.768 Reported 2.26 2.07 2.0 1.93 1.86

Doping of Cd component in a Binary semiconductor like ZnTe and changing the composition of do pant has actually resulted in lowering of Band Energy Gap. Thus effect of do pant increases the conductivity and decreases the Band Energy Gap. Graphical Representation:

This graph represents Band Energy Gap values of CdxZn1-xTe

Future Plans: 1) Current data set of values of CdxZn1-xTe II-VI Ternary Semiconductors and Band Energy Gap values include the most recently developed methods and basis sets are continuing. The data is also being mined to reveal problems with existing theories and used to indicate where additional research needs to be done in future.

2) The technological importance of the ternary semiconductor alloy systems investigated makes an understanding of the phenomena of alloy broadening necessary, as it may be important in affecting semiconductor device performance. Conclusion:

1) This paper needs to be addressed theoretically so that a fundamental understanding of the physics involved in such phenomenon can be obtained in spite of the importance of ternary alloys for device applications. 2) Limited theoretical work on Band Energy Gap of CdxZn1-xTe II-VI Ternary Semiconductors with in the Composition range of (0 Results and Discussion: Band Energy Gap is used for Electrical conduction of semiconductors. This phenomenon is used in Band Gap Engineering. The band structures of the alloys show similar features To that of bulk CdTe and ZnTe. Acknowledgments. – This review has benefited from V.R Murthy, K.C Sathyalatha contribution who carried out the calculation of physical properties for several ternary compounds with additivity principle. It is a pleasure to acknowledge several fruitful discussions with V.R Murthy

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