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ByMrs.M.S.Revathy

Under the Guidance of

Dr.T.ChitravelDirector-Research

Anna University of technology Madurai

Madurai

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INTRODUCTIONNanotechnology is an umbrella of multidisciplines. Its exploration in semiconductingfield is drastic and set forths vast technological

applications such as sensors, light emittingmaterials, short diodes, memory devices etc.

With the excitement of its growth, thepresent research work will rely on wide band gap

semiconducting materials of II VI and III V groupin particular, chalcogenide nanometric thin filmsexhibit tremendous opto-electronic applications.

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Seminconductor materials with electronic band gaps larger than one or twoelectronvolts(eV).

The exact threshold of wideness often depends on the application, such as

optoelectronic and power devices with band gaps > 1.7 eV

Wide band gapsemiconductor

Oxides materials :ZnO, CuO, SnO etc Eg

1.2 eV

Chalcogenides,

selenides,telluridesCdS, CuS

etcEg 2.2 eV to 3.8 eV

Alloys: CdZnS,

Titanium NitrideCobalt, Nickel Ferrous

larger Eg

Wide band gap semiconductors

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FABRICATION

Present work focuses first on the fabrication of

chalcogenide family thin films .

Thin film

y Any solid or liquid object with one of its dimensions very much lesserthan that of the other two is called a thin film.

y Thin film devices would typically be about 5 to 50 m thick in contrastto bulk devices, which are about 50 to 250 m thick.

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y Evaporation

y spray pyrolysis

ychemical bath deposition

y dip coating

y electro chemical deposition

y chemical vapourdeposition (CVD).

Out of which chemical bath depositionyields costeffective, stable, uniform, adherent and hard films withgood reproducibility by a relatively simpler process.

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XRD : Identifies the crystal structure. TEM : Determines the size.

AFM: Visualizethe surface texture.

SEM : Characterize the topography of the sample.

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SEM Inside surfaceof eggshell

AFM showing all atoms within the

hexagonal graphite unit cells. Image

size 22 nm2

TEM imageXRD

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y Sensorsy Light emitting materials.y Memory devices.y Laser Protectiony Optoelectronicsy Infrared detectiony

Photoconductorsy Solar energy conversion, Solar Cellsy Nanomaterials (Phosphors for high-definition TV)y Nanocrystalline zinc selenide, zinc sulfide, cadmium

sulfide, and lead telluride

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REFERENCESREFERENCESy [1] J. Aguilar-Hernandez, J. Sastre- Hernandez,N. Ximello-Quiebras, R. Mendoza-Perez,

y O. Vigil-Galan, G. Contreras-Puente, M. Cardenas-Garcia , Thin Solid Films

511-512,143 (2006).

y [2] David Zubia, Cesar Lopez, Mario Rodriguez, ArevEscobedo, Sandra Oyer, Luis Romo,

y

Scott Rogers, Stella Quinonez and John McClure, J.Elect.Mater. 36,12 (2007).y [3] T, Chandra, S. Bhushan, J.Mater. Sci. 39,6303 (2004).

y [4] Wenzhong Wang, Igor Germanenko, M.SamyEl-Shall, Chem.Mater. 14,3028 (2002).

y [5] T.Taguchi, Y.Endoh, Y.Nozue, Appl.Phys.Lett, 56,342 (1991).

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Thank you