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The effect of hydrogen on the optical, structural properties and the crystallization of GeTe₂ thin films prepared by RF ...

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Material Information

Title:
The effect of hydrogen on the optical, structural properties and the crystallization of GeTe₂ thin films prepared by RF magnetron sputtering
Physical Description:
Book
Language:
English
Creator:
Cao, Ke
Publisher:
University of South Florida
Place of Publication:
Tampa, Fla
Publication Date:

Subjects

Subjects / Keywords:
Chalcogenides
Amorphous
Optical band gap
Absorption coefficient
Annealing
Dissertations, Academic -- Physics -- Masters -- USF   ( lcsh )
Genre:
non-fiction   ( marcgt )

Notes

Abstract:
ABSTRACT: Thin films of GeTe₂ were deposited on glass substrates using RF magnetron sputtering with various hydrogen flow rates in the growth chamber. Transmission data of deposited films were taken and used to determine optical constants: refractive index (n), extinction coefficient (κ), and absorption coefficient (α)) and the energies: E₀₄, E₀₃, Tauc band gap EsubscriptTauc and Urbach energy EsubscriptU. An increase of these energies was observed with increasing hydrogen flow rate. This increase is interpreted on the basis of the density of state model proposed by Mott and Davis. An increase of network disorder due to the inclusion of hydrogen into the GeTe₂ thin films was determined from the Bsuperscript1/2 parameter, Urbach energy and full width at half maximum of Raman vibrational modes. The crystallization process induced by thermal annealing on GeTe₂ was studied. X-ray diffraction measurements were performed and the results suggest that crystallization of GeTe₂ occurs via a phase separation into Te and GeTe crystalline phases. This observation is in agreement with a previous report. The crystallization temperature increases with the addition of hydrogen. This increase is explained in terms of dangling bonds. A large change (approximately 60 percent decrease) of the optical transmission occurs after the phase change from amorphous to crystalline. This decrease is interpreted as a result of the observed phase separation.
Thesis:
Thesis (M.S.)--University of South Florida, 2008.
Bibliography:
Includes bibliographical references.
System Details:
Mode of access: World Wide Web.
System Details:
System requirements: World Wide Web browser and PDF reader.
Statement of Responsibility:
by Ke Cao.
General Note:
Title from PDF of title page.
General Note:
Document formatted into pages; contains 35 pages.

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 002001388
oclc - 319699962
usfldc doi - E14-SFE0002628
usfldc handle - e14.2628
System ID:
SFS0026945:00001


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The effect of hydrogen on the optical, structural properties and the crystallization of GeTe thin films prepared by RF magnetron sputtering
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ABSTRACT: Thin films of GeTe were deposited on glass substrates using RF magnetron sputtering with various hydrogen flow rates in the growth chamber. Transmission data of deposited films were taken and used to determine optical constants: refractive index (n), extinction coefficient (), and absorption coefficient ()) and the energies: E, E, Tauc band gap E[subscript]Tauc and Urbach energy E[subscript]U. An increase of these energies was observed with increasing hydrogen flow rate. This increase is interpreted on the basis of the density of state model proposed by Mott and Davis. An increase of network disorder due to the inclusion of hydrogen into the GeTe thin films was determined from the B[superscript]1/2 parameter, Urbach energy and full width at half maximum of Raman vibrational modes. The crystallization process induced by thermal annealing on GeTe was studied. X-ray diffraction measurements were performed and the results suggest that crystallization of GeTe occurs via a phase separation into Te and GeTe crystalline phases. This observation is in agreement with a previous report. The crystallization temperature increases with the addition of hydrogen. This increase is explained in terms of dangling bonds. A large change (approximately 60 percent decrease) of the optical transmission occurs after the phase change from amorphous to crystalline. This decrease is interpreted as a result of the observed phase separation.
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Annealing
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0 r,:01'r r(r rr, r ,:>rr 8n"5::@:;03:r( A: rr, $r,:0rr B1rN,/C rr1r5rr'r r 8n"!1r A: ,"r(rr1 rrr 1 A: 8n"! ,=,,;$r rr rrr rrr rr rrr,8( rr rr 7n r rr, ,:?:? 1rr r1r/ :7nr( rr r,6 1(7r1 rrr/,@=3:,=H rr3r rr,rrr rr/,@=3:,=Hr 1 r(rrr 3r B1rC,rr11n1rB CrrB,:?Cr r rr r1 rrr,r 1B2!&Cr11 rrr 1r=//,

PAGE 37

? n&rnr n # nn$ &rnr n # nn$ &rnr n # nn$r:?,rrr1BC1rB C1: BC r1r,=,,<2!&rr 6rr(r rr r(r2!&1rrr rrr(,/, ,/12!&rrr 3r, 6 r ;=/U, ,/ r11: n1rr r;//Urr r rrr;=/
PAGE 38

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PAGE 39

;: rr,rrrr rrrr rrr, $2!&r,/r( rr rr,r r r 7; r rrr/,@=3 :,=H,&rr rr r(rr 3rrr 1,:?,

PAGE 40

; r> 1r5r rrr rrrrr r, B//G C rr/,@=3:,=Hrr1 (r

PAGE 41

;; !r :D,,"],$,&( rrrr 7r*rB:?@?C ,$ rnr n r! nr"r#$rn% -* #1rB:???C ;"8D rEDr"r 00C = &,#&,$",#1n,#1#,##,9 -,.,., $,, =<;B// $,r($,9,9$,-(, r!,-6r, r,&(, <=B//=B//=C ? ,,I",,,$ ;/C :: $,# (,$,r5$,$5(., ,'rDr "r, @/;B//B//>C :;# ($,H,,.,'r ,.rD3r :>:B//>C :<.,#,n,9,..,",Hr,, r.,$,, :/;=/0 B//>C, :=,&,,)-,$ -,-r5E, ,!(,9, :<0/B:?0:C :>,.,n,r!(,, :B:??/C

PAGE 42

;< :@.,$,".,D3r, =>?B:?@C :0!1.,,*,6r, ::B:?0*AA111,) (,A!A"r39 !$ "n! @.,,"r.,.,,r., ://B:?@>C 0,,-r6, r.,","r` .,,, 0> B:???C ?., nr)* nr% D1Er5*r, B:?@C, ;:$,!,I6, r,!(, ;0;;B:??>C, ;,'r ,!(, :;C ;=$,n,"rr,",$ 3!H ::;B// nr ,"-r*rr, B:??>C

PAGE 43

;= r :, rE,E]"rB:???C 'n$ nr rr, .]#51B//;C ,nrnr% r]r, ;, "$,B//:C r&% #1r$ r, <, "rB:??C nr$$n% $r, =, $, B//=C &r&$nrr $(r% D1Er5*7r'(rr, >, B//=C $'n r!#r % rr