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SYNTHESIS AND CHARACTERIZATION OF NEODYMIUM SULFIDE BULK SAMPLES AND THIN FILMS

THACHERY, JUGUL RAVINDRAN
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1012424793

Abstract Details

2002, MS, University of Cincinnati, Engineering : Electrical Engineering.
Rare-earth sulfides provide a more stable alternative to reach Negative Electron Affinity (NEA) than the conventionally used cesiated surfaces which are sometimes deposited as alternate layers of Cesiumand Oxygen in the yoyo technique. In this thesis, we focus on a study of Neodymium Sulfide (NdS). The attractiveness of NdS resides in the predicted low work function value of 1.1 eV at room temperature, chemical and thermal stability, and high melting point of nearly 2200 C. The development of NEA surfaces with large quantum efficiency requires the mutual alignment of the crystalline energy levels at the semiconductor-surface junction. The choice of GaAs and related compounds as substrates is particularly attractive since the lattice constant of GaAs (5.6533A) closely matches that of NdS (5.6963A) in its cubic crystalline form. In this thesis, we report on the successful growth and characterization of NdS bulk samples and thin films. The bulk samples were grown by reacting the rare-earth element (Nd) with the rare-earth sesquisulfide (Nd2S3). The synthesized samples contain an oxysulfide impurity (Nd2O2S) which is removed using a carbon reduction method. NdS thin-films are formed by RF sputtering using a 2" target made out of the purified bulk samples. Thin films are deposited successfully on both Si and GaAs substrates. Both the bulk and thin film samples are characterized using X-Ray Diffraction and Raman Scattering techniques. The work function of the NdS bulk samples and thin films are also measured using a Kelvin probe technique.
Dr. Marc M. Cahay (Advisor)
130 p.
COLD CATHODE; NEODYMIUM SULFIDE; NEGATIVE ELECTRON AFFINITY; WORK FUNCTION; THIN FILM X-RAY DIFFRACTION

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Citations

  • THACHERY, J. R. (2002). SYNTHESIS AND CHARACTERIZATION OF NEODYMIUM SULFIDE BULK SAMPLES AND THIN FILMS [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1012424793

    APA Style (7th edition)

  • THACHERY, JUGUL. SYNTHESIS AND CHARACTERIZATION OF NEODYMIUM SULFIDE BULK SAMPLES AND THIN FILMS. 2002. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1012424793.

    MLA Style (8th edition)

  • THACHERY, JUGUL. "SYNTHESIS AND CHARACTERIZATION OF NEODYMIUM SULFIDE BULK SAMPLES AND THIN FILMS." Master's thesis, University of Cincinnati, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1012424793

    Chicago Manual of Style (17th edition)

ucin1012424793
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© 2002, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12