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Development of window layer for high efficiency high bandgap cadmium selenide solar cell for 4-terminal tandem solar cel...

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Material Information

Title:
Development of window layer for high efficiency high bandgap cadmium selenide solar cell for 4-terminal tandem solar cell applications
Physical Description:
Book
Language:
English
Creator:
Vakkalanka, Sridevi A
Publisher:
University of South Florida
Place of Publication:
Tampa, Fla
Publication Date:

Subjects

Subjects / Keywords:
Super lattice
Ternary
Zinc selenide
Zinc telluride
Copper selenide
Dissertations, Academic -- Electrical Engineering -- Doctoral -- USF   ( lcsh )
Genre:
bibliography   ( marcgt )
theses   ( marcgt )
non-fiction   ( marcgt )

Notes

Summary:
ABSTRACT: Tandem solar cells fabricated from thin films provide promise of improved efficiency while keeping the processing costs low. CdSe as top cells are investigated in this work. CIGS has been a standardized process with lab efficiencies reaching 18% 53. This dissertation focuses on the development of conductive window layer for the development of a high performance, high bandgap solar cell. ZnSe, Cu2-xSe, and ZnSexTe1-x are investigated as viable window layers of the top cell. ZnSe in undoped form forms a good junction with CdSe films, but the Voc from these devices could never exceed the 360mV mark, while the current densities approached 17.5mA/cm2 61.To improve Voc's, the high contact energy at the ZnSe/Cu interface has to be overcome by replacing Cu with a metal having higher work function or doping the window layer to form a tunneling contact with Copper.Deposition of ZnSe from binary sources in presence of nitrogen plasma resulted in films with proper stoichiometry. However, doping could not be accomplished. ZnTe is easily dopable, and was the next alternative. ZnTe doping in presence of Nitrogen plasma resulted in Zn rich films. Hence doping of the ternary compound ZnSexTe1-x was considered. This work focuses on studying the effects of compositional variation on the conductivity of the ZnSexTe1-x films. ZnSexTe1-x films were doped using Nitrogen. Films were deposited by co-evaporation from ZnTe, ZnSe and Se sources. Te/Se ratio was varied by varying the ZnTe thickness and Se Thickness. Films with Zn/Group VI ratio close to 1 were measured for conductivity using IV measurements. Highest conductivity of 2* 10-8 ohm-cm was obtained at ZnSe, ZnTe, and Se thicknesses of 2000Å, 1500Å, and 500Å respectively. The actual carrier concentration could be concealed by the current limiting Cu contacts. All films with Zn/Group VI ratio close to 1 showed slight conductivity in the 10-10 ohm-cm range. Layered ZnSexTe1-x Films doped with Nitrogen had targeted^Zn/Group VI ratio of 1, but with a higher Te content. The films were also slightly conductive, in the 10-10 ohm-cm range. The mechanism limiting the doping in all the films seems to be the same.
Thesis:
Dissertation (Ph.D.)--University of South Florida, 2006.
Bibliography:
Includes bibliographical references.
System Details:
System requirements: World Wide Web browser and PDF reader.
System Details:
Mode of access: World Wide Web.
Statement of Responsibility:
by Sridevi A. Vakkalanka.
General Note:
Title from PDF of title page.
General Note:
Document formatted into pages; contains 109 pages.
General Note:
Includes vita.

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 - 001914569
oclc - 176854888
usfldc doi - E14-SFE0001761
usfldc handle - e14.1761
System ID:
SFS0026079:00001


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66 =n42n10>nrnr I)nnrnrrn 9Jrn:rnrr0 -0 1 InI)nnrnr&3 =nnnrnrrnrr0 -0 1 0 6 1 nnn =r"nJrn8nrnr rrnrnnr =n42@14A3=nrnn nnnrrI)n n ,8=rnnr nnrn,8= nrrnnnn#nrr rn=nn Jrnnrrnrrn rn,8rn #rnnr&nnrr nrnn ,8nr$rnnnrnnr rnI)n n nn);n7rnr& nnnr/ #,Dnnnnnnrn nnrnn nnnnnInI)nn nnn rnnnrn); nr=n44 @24A$rrnrrnr n0 -0 1 .rnn&nnnnnn nrnJrn rnrn);nrnI)n n nnnr);nn nrnnnrJrnrn rnnn 20InF0n);FLIn7rnn nrnrn ,rrnrI)nInn nn-0 6 1 10 ? 1 nnnnnnrnr n9InF0 n);:rI)nnnr.Cn r=n45 @16A

PAGE 91

6? n3 3/nK 6 >6 ='nA (?3* n3 )'>5A0=0/00 2n/n$(.B*

PAGE 92

6B .nnrnI)nIn);nnn rnn.Cn n=n45nnnnnrr& rnnnI)nn I)n n rnnnnn nrn rn);rnnnrn rrnI)n n0 6 1 .nnrnI)nnn); nnnrnnnIn nnnnrnn.Cnr nrnrr nnnI)nnI)n n rnnnrnrr I)nnn8Cnnn-0 6 1 1 .nn);9I)nIn:nn nrnJrnn rnrrrnn&I)nr8 Cnnn[0 4 1 Jrnn0 6 1 rnrnnrn& I)nnrnrnrnnrn rnrr0 6 1 nrnrrrrnrr&n nnn&I)n n.Cn=n45rn nnrr nI)nFI)n n rnrnnrn r nnnnnnnn&I)nnr n 26 = > 4> 5. 3nnrrnn rnI)n n 3n nrrI)nInrnrnr nnn!r nnnrnnn&nn nrrnn3n nnrnnnrr nnrnrn nrrrI)nInrn#n nnnnrn

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?0 rnnnnnnI )nnrnnn rrnnn8rrI)nInr nnnnrnrnr nnnrnnn rLrnnrr rn100 8nnnnnnrrnnn Hnrr)nr nrrU,rnrn I)nIn 3nnnnrnnrrrnrn nn8rnrn nnnnnnrnn nI)nInrnn nn;nnnnnn nrnrnnnnn nrnI)nIn rnrrn rrrnnrnnrn3 nrnrrrnn nrnnrnnn rnnnnr3n rrnrnnr rnrnrr nnrnnnnn U,rrnrnnnnn rInr=n 46=rn&nr=n46In I)nnI+nn @An&-42-?nnn-654nn nnnnU,rIn rrnrrrnrI)nn nrnnnr nrn9*nn8n=n46:n); I)n n 9+n8n =n46:n@An&nnnI nI)n-55666 -51?46nnnnrI)n 04 n 04 nnrnrnr n=n4?nnr r?0>nrnnn

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? A 1-?000-654000 In/ Jr&@7A-n@nA.@>A 140000-42-?000 n3 BO%/0A>"=K 6 >6 A#nK nnnn400 8rnnnrnnn rn rnnnU,rnn n=n4B4-0 rrnnn=3#$rnn nnnr0111r 0-?rnn"nrn 7n@A rnrI+nn= nnnnnnr rnrI)nn!rr,nr rnnnr100 8 4"##05 r1 ("" 6*76*76*7&()8 6n6,&!9 6n6 6&!9

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?nnnnnnnnrnnn rn"rnI)n n 3nrnrrnrrr rI)nnrrr nrnnn & & & & & & & &n & nnr !r"#""# )(r/!r9 ), n3 D%0K 6 >6 n3 FO%/0=K C 3 C 3 #3CCA 4"##05 r1 8rF

PAGE 96

?1 4r+,#":, & & 8#)r9r;( 4"&05 &1<#07"18<=05 &1 9%"/r7#0:1 &n&&nn & 4r+,#":(%r/!r9 & & 8#)r9r;( 4"&05 &1<#07"18<=05 &1 9%"/r7#0:1 &nn&&nn & >?&+90)1 r091@0$1 &n&& >?&+90)1 r091@0$1 &&n& n3 +CO%/0A>"K C 3 C 3 #3CCA 26 /% != > 4> 5. 3nrnrI)n n 100 8)nrnrrrn nnrnrn nr7,8rrn nrr"nJrnnrrnr nrnrnnr n$=8nrnJrnnrrn r7rnCrn 8rF
PAGE 97

?2 Hnrrrnnnnrnn nnrrnnn rnnrnnrnnnr nnnrnnrn rr"JrnrnnrJr nrr"nnnnn rnnrnnnrnnn nrnnrn nnnnnnnnrnn rnnnn"r nnrrnnr rnrnnnn nnrnrnnrnn -F1rnrnrn@52An rnrnrnnnr nnrnnrn nnn&nJrn!nn n nrnnrnr nnn&n7r@52A .rnJrnn 7rrnnnJrnrnn nrnrnn rnrnnr41Crrrnn n7nrnrn nnnrnnnnrnr nrn&nrn60C n3 +A/0K 6 >6 K6%

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?4 &3 )'n 26/!4(/ = 5.r&nnnrnnnnn rrrrnIn )nJrrnnnnrnrnrn rnrrrIn )nrnnnrn7/J rr2/7rnJrn nnnnnnnnnrr rnnnnrI)nn rrInF)nrr=n 4-=rn=nn nI)n n nnnnnnnn n)n Hnr7rnn nnnnrnrr rC.nnnnI nnnrn rrrnrO04nnn rrrrnnnnn nnrnnrO04 rr2/#rnnn nInrr=r =n46nrrrn r40>Innr-4nn nnrrrrnnnr nrrrnnnnr)nn rInF)nr2Fr =n4*=r24)88$ 8rnr0-7,8 8rn8n007$) 7rn8n0-7,8 7rnCrn4BC,8 Jn"r8n00?B7,8

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?5 n3 ++K 6 >6 A060K 6 %0?,'2.nnnr=n4--r)n rnrnnnrO04 rn#rnnnnI nI>rnrn )nrnr n3 +.K 6 >6 A0K80 +CCCNK8,'#7+""A $ $ $ )#74!7 & & & 8A" $ $ $ )#74!7

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?6 26 /!4(/ 5.!.=+= %& +nnnrrnrrn nnrnnI)n nnrn,)nrnr rrnrr nrrnnrrC.nnn nI)n&nnn nnn-000V-VFnnn nn&nn rIn)n=rnnJrn rnnrnnn rnnnnrnnnrnJ rnrrnrrrrn nrrrrI)n n rrIn&nr =n4-1nrrC.rrrrn rnnrn&nrn In#rnnnrrnrn nIn&n nnn)nnrrnnnrn nrrn nrn&rnn)nI n&nnnnnr nrrrnnnI 7nnnrrn nIF*rCrrnrn rIn&nr-000V nrrnr)n&nr--0V 400V 3nnJrnrnnrn rrrnnIn &nnnrn rrnnnnn rrr#nIn&nnn rnnIrn r)nI)n&nnr000V-000Vn nnnnnr =n4-2.nnnrn)n&n nJrnrnrrr nnnrrr3nrr nnnnrn0> n&nnnIrnrnrnnn nrn40>

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?? n3 +?0002n!A 0K 6 >6 P 8CCCNK80+CCCN n3 +3A50K 6 >6 K80 A80CCNK8 0+CCCN .nnnrnnnI)n)n&n nnnn-000V 00VnnnIn&nnnn rnnnnnr rrrrrnrrn I)n n =n4-4r nrrrrrI)n n nIn&nrr)n &nr00VIrnnnn rnr40>nnIn #7+""A $ $ $ )#74!7

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?B &nnr-00Vr600V7nn nnnnr rnnnn8n. .nrn r400V8r0 nnnnrnrnI)n n IF*rC. rrnr8rrrrrr nnI)n n n rnrnJrrr nnrrrrn nnn#nnnnnrnnrn8 rn rrnrn.Cnnn rnnnnnrn rnnnnnnnn nnrnrrnn nnr?Cnrn nrn r=n4-5 n3 +)A"$0A>" K 6 >6 ,K +CCCN;K3CCN;CCNPK?F DQ;?C D DF .+Q.nnnrnnnr nnnnnnnn 8rnnnrrnr nnnn8 rnrnn#rnnr nrrnn 7+ B027 527 47 U B 4-7 -247 1B67 ---7

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B0 nn2rnnnrnr nnnnrnnrn rnnnnr-0Crn rrnrnrnrr nrnnrr4Cn nnnrnn nrnnnr rn.Cnnn -0M0 ? W )nnrnrnrnr nnnn nnnnnnrrrnnr rnnn.n rrrrnnn rnn8rn rrnnnnnnn rrrnnn nI)nnrrrrn n#rnnrnn rrrnrnnnnn nnnW ->nnn I)nnrrrrn#rn nrnrnrn nnnnnnrrnnnnrr nJrnn nrnrrnrrr rnnnrr nnrrrrrnn rrnrn r &3 BA5A" 0K 6 >6 #7+"" #7+"" #7+""$$ $ (!!r n' n&& &&) &n& &&) &&&&) && &) &n&&nn) =n4-5nnnnnr rrnrn I)nIn)n&nnr-000V400V 00Vnnn#rnn nrnnnnrnr rnrrrn)n nrrnnnrrn rnnrnnr

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B n)nnrrnrnnn nJrnrnrnn nnrnnnnnnr nnrnnnnrn nrnrnnnrn $rIrrr rnrn40>&rnrr rnnn=n4-4 .nrnrrrnrn nnnI rrrrnr40>nnr nrnnnn nnnnnrn46=r rInI)n)n&nnn rrrrrnrnn rnrrn nrrnnnnn rnrn rnnr=n4-6nn r=n4-5n rrrnn.nnnrn= nnnnnnn rrnrnnnnn nnrnn nrrnrn rnnn8 rrrnnnnnn rnn rrrnI)n n nrnrnnnn n rn46rnrn nnrnnnnnn8 rnrnnr9]: nnrDO ]9CF:Y 3nnCnn9?C:n nnnnn8r 7nnnnnr rnnn rnrnnrnrrn nnr

PAGE 105

B.nInn&nnr40> nnnnn r7nnnInnnr nrr4->rnnnn nnrrn nnnnrnnr Innnr40> n3 +BA"$0A>" K 6 >6 rnnnrnr nnnrr nnnn#rnnrnrnrrn nnrrr nn,)rrnnnnrrr nnr &3 DA"0A>"K 6 >6 (/"##$(97##B C%7 % & &n &3%n n& & &n3% & & &3% & & &3% & & &3% &n &nn &nn3% &n & &3% 7 + -67 U -07 -57 B7 5?7

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B1 26!!&!#!)&/!nnnnnrnnrnJrnnnn n7rnCrn n7rn8n7rnCrnrrnnn rnr&nn nnn7rn8nrrn rnr)nnrrn nrrnnnrnrnn r41C0-7nnn nnnnnnn.rnn nnnrnn rnnnrnrn41C .rnnnnnrn nn0-7nnrnrn nnr60C+rnn nnnnnnrrr rrn4B40 4nI)nIn)nnnnn -000V600V400V nnn.nnnnr nnrrr rnrrn &3 F'nn#A I/451>)n/1B14>n/B0-> *=r?-)88$ 8rnr0117,8 8rn8n0-7$) 7rn8n0-27,8 7rnCrn4-0C,8 Jn"r8n00?B7,8

PAGE 107

B2 &3 C'nn#5 n I/4?>)n/1610>n/0??> & 3 'n I/2B1> )n/2210>n/51B>26, /!" = =5. )nnnnrnrnI)nIn rnrn nrnnnnnrr nrnn)n ;n9);:rnnnI)n n rrnnn nn3nnnnrr nnrrrr I)nInnnnnn#nnn rn);n rnrnnrrnI F*rC.r7nI)n *=r1)88$ 8rnr0--7,8 8rn8nBB7$) 7rn8n0-7,8 7rnCrn600C,8 Jn"r8n00B27,8 *=r24)88$ 8rnr0-7,8 8rn8n007$) 7rn8n0-7,8 7rnCrn4BC,8 Jn"r8n00?B7,8

PAGE 108

B4 InnnnrnrI)nIn rn=nn nrnnnrrnrrr nnrrnI)n&n n-000VnIn&n nrnnnr rrnIn&nrnrr rnnnnnrnn rnn nIrrr) nrnrnr nnnrnnnInJrn rnnIF*rC.r nnnrnnnrrr rnnnr rnrnInnrrn rrnnrrn rnnrnInn"nnr rrrnIn &nrrnn&nr nInnnnn rnrInI)n&nr-0 n)nnrr nnrrnnnnn n100Z8 =r=n4-6nIn&n nrrnnrIn nnnrrrnnIrn nnnnnrnn nnnrnnIn& nn)nrrnnn nrnrrrrnrr nnIn&n 7nnn=n4-?nnr n07n?C 7nnnnnrrrn)n nrnnrnn nnnIF*rC.rH rnrrn rnnrrn nrnrn

PAGE 109

B5 n3 +DA50=K 6 >6 K8 ,'/nK/7nnnnrnnrr $nnnnnn rnnnrnr 3nrnn nn)nFnrrnrn nrnnnnr nrnrnnnnnnnr nrn rnnnn
PAGE 110

B6 rnrrrnn)nrr rrrrn rrrnnnnrrr rrnrrrr nnnrnnnnr nrnrnnnrn n262 /!= > 4> 5./ !..%& ,rnrnrnnnrn rnnnn nnnnrrn100 Z8I)nInrnnn nnI)nnnrrn nnrnn I)nrnnnrrr rrIF)nr,) nnnrnrrnrn I)n n&n#rnnr rrnnrnnInr rnnnIn nnnnrnrrrnIn =rn &nnrI nrrrr4B>I2>nnn r,)In nrnrrnnnnrrnr nnrIn nrnnrnIF*rC. rr#rnnnnrn nnn4>.nnn nnnn IF*rC.rnrJrnrnnn nnr 28%)= > 4> @ 8)nrnnI)n n nrrnnnn )nrrrnrnnn nr rnrnnrnrn rnnnn n);rn4nnr4I)n 0Inn nnnr100Z8nrrnnr nInnrrn

PAGE 111

B? rrnrn4-52>I655>)n -B60>n=rrnrn -000VrI)n?00VrIn000V)nn nnrnn nnnr100Z8nI)nnrnr nrnrn4?> 22??>11>nnnnrnrnn nnrnrn nnI)n n nnnn4-n4 1nnn &3 +%0AAA>" K 6 >6 0r = )nRC r 9C:==9>:D 97F : 0--?050--016551 0--?0501-01B4225 0--?050201?1-2 nSnrnrnnnnr= n-B=n10nnn rnnnnnnr nnnnrrnr rn&nnrrnn nrnrnrn rnnrnrnrnrn7r nnnrnnr 8)nFI)n n rnnnrnrnrn nn &3 .%0AA=K 6 >6 r= )nRC r 9C:==9>:D 97F : 0--10501--02?52-0--10502-102?220 0--105041101-04? 0--105061501024-?

PAGE 112

BB n3 +FL %0AA>"K 6 >6 /" n3 .CL %0A=K 6 >6 /"

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00 =rnnnI)nrn?0 V&nrnrr nnnnnrrnnn100Z8 rnnnn nnnrnrnrnnn rnrn

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0 # n"rnn5rr@ C 3 &% ,rrI)n n nnrnrnn n +rnnrnrnnn rn7 IF*rC.rrnrnnr nr nnrn)nFnr=rnrn rnrrIrnrnr 40>rnnn[0>nrn#rnn nrnnn)n nrnnrnrrnrn rnnnr nnIF*rC.rrnrr nrrnnr nInnrr7IF*rC. rnrnr #rnnnrnnnnr nn8r =rrrnnnnrrr nrrnnrrnn rrnnn rrrnrnrn nnnrr nrn#nnnrrn nnrn rrnrnnrnnrnnr nrnrnrn nnrrrnrrr nnrn#rnn rnnIF*rC.rrnn nnrnrnrnnr nnr=rnn nnrn

PAGE 115

0rrnrnnnnn .rnrrn ..C.rn nnr$+ rnnn.nrrn nnrrJrnn I)n n nnnnrn nrr nrrnnn nrnrnn nn7nnnnnr nnnnn nrnrr#nnrnn rnrnrnn rn&3 5%%@0% )nnnnr&nnrnrn nnrrrrrr nrrnI)n n nnnrnrnrr nrnn!nrrr nnnJrnrnnn rnnrnn rn#rn nn@1-A8rrrnnnr nnn nrnn nnrn7rnn rnnrB>rnrr rnnnnrnr. nrnnnrrnrn nnn Jrnrnnrr rnrrnr nnrrrnrnnrn nrnr nnrnnrrn rnrrr rnnrnn nnJrnr )nnnrnrnrnn

PAGE 116

01 )nnnnrnnr nrrnnnrr I)n n rrnnnnnrnrnn 8)nrn I)n n rnrnnnnrn nnn #nnrnnnnnrrn 100Z8rrnrnn rrrnrnIF*rC .rnn r7rnrr nnnrnn nnnnnrrnnn nnrnn

PAGE 117

02 5n @A ,$88)=n*;5'A ( Drr8*r4B-22-26BB5@1A /FFn&nrF&F)r_r

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04 @2A /FFF&F&_FrFr & @4A ;Nr&;+n$;nr^r) n'+,r 8)F89.*:)n-#nnrHr7<;n 5690:2)nnn BB4@5A Dn,K> K>AA ()rn$n)r8n25 1-111BB6 @-A ,;^r$8rn$rnr)7n '90 >A (9;> AAn>AA n8 #1&! (11B122BB0 @-1A D#r)D=r$*rDU;= N' /nMn A ( $ (8rrrnrn8rn? 8&> $A (
PAGE 119

05 @-5A <$n*))DnnD* $) ))C&&&8)=nn&n, ;$rn' ''>5' A#&&A ( $n)nnnn+5-?1 -B-004 @-6A )Dnn' /"0A#&&=0 A ($nn%nr)r=r $-002 @-?A #n' /"0!>21 !A (41642B?? @-BA 3=n' /n0rn''>5'A (Drr8 *r25?0?5BB4 @10A <$n)Dnn8)=nn&n, ;$rn' /"0 ''>5'nn/"0n00 A ( 5'A ( Drr8*rB6446452BBB @1-A I^);+"&r&J8*n#$n /0% K&$6#& A@n #n (7n<;nn5B9:?-?2B B5 @11A 7Nnn*n+J$8< nrN7K2 (7n <;nn549B:-2BB2@12A ,+n,,#&r8Nrn 3nJ3nn# 3)r&' '"5A'+>&A (> ( 7n<;nn529-0:-5?--5?2B B2 @15A ,+;&8*Cn3n*=Jn&) /K=KK (Drr8 *r4B6266BB5

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06 @1?A )C&&&8)=nn&n,;$rn' /"0K 6 >6 > A0n>00 ()nrn1. & A (SnnnrDn)nnn B?0+rn 7nrn8r)nn37 @2A <$n)Dnn)C&&&8)=n n&n,;$rn n>!0A>A ()rr =8rnn5' A (Drr8*r5-04-1 BB5 @21A .)#&rD)r)^3N7K K&An#"2n& nd dd d>n 7 (7n<;nn609B:BB6 @25A 3=n)=nn#)n' /n=r''>5' A&="!n (Drr8*r-56 -6-BB4@26A ^=D#;#n;*r$)+ D3&nJ$Drr 7CJ&&r' &"=0>/nK ( 7n<;nn549?:BB2 @2?A 8*Cn3n,+;&' 2n/nKK (. )r)n8rrrB1r422 6240BB4

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0? @2BA <$n)Dnn8)=nn&n, ;$rn' #0 A!nn''>5' $'!" /" ()r=2121-25254-001 @40A $*rn&n7;=nD)n' 2$n0A' AAn (5n%0 9A (D7
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0B @5-A #)&' 00"!nA0A,';+ AnA= ($nn%nr)r =r=;BB?@51A C8n&'nr#nnn nn7rn;n &nr89.*:)n-=)r8n( $nn%n r)r=r=;Jrnn-004@52A Cnnr.n$&..r)rn8rrn!n r$ @54A /FFrnFF566-)-001F7=60?4+B 224=25+1+B22 65-+2B-8046F0F;nn

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nrrr rr "# $ rr %r$&''( r)*)+rr,$


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TK145 (ONLINE)
1 100
Vakkalanka, Sridevi A.
0 245
Development of window layer for high efficiency high bandgap cadmium selenide solar cell for 4-terminal tandem solar cell applications
h [electronic resource]
by Sridevi A. Vakkalanka.
260
[Tampa, Fla] :
b University of South Florida,
2006.
520
ABSTRACT: Tandem solar cells fabricated from thin films provide promise of improved efficiency while keeping the processing costs low. CdSe as top cells are investigated in this work. CIGS has been a standardized process with lab efficiencies reaching 18% [53]. This dissertation focuses on the development of conductive window layer for the development of a high performance, high bandgap solar cell. ZnSe, Cu2-xSe, and ZnSexTe1-x are investigated as viable window layers of the top cell. ZnSe in undoped form forms a good junction with CdSe films, but the Voc from these devices could never exceed the 360mV mark, while the current densities approached 17.5mA/cm2 [61].To improve Voc's, the high contact energy at the ZnSe/Cu interface has to be overcome by replacing Cu with a metal having higher work function or doping the window layer to form a tunneling contact with Copper.Deposition of ZnSe from binary sources in presence of nitrogen plasma resulted in films with proper stoichiometry. However, doping could not be accomplished. ZnTe is easily dopable, and was the next alternative. ZnTe doping in presence of Nitrogen plasma resulted in Zn rich films. Hence doping of the ternary compound ZnSexTe1-x was considered. This work focuses on studying the effects of compositional variation on the conductivity of the ZnSexTe1-x films. ZnSexTe1-x films were doped using Nitrogen. Films were deposited by co-evaporation from ZnTe, ZnSe and Se sources. Te/Se ratio was varied by varying the ZnTe thickness and Se Thickness. Films with Zn/Group VI ratio close to 1 were measured for conductivity using IV measurements. Highest conductivity of 2* 10-8 ohm-cm was obtained at ZnSe, ZnTe, and Se thicknesses of 2000, 1500, and 500 respectively. The actual carrier concentration could be concealed by the current limiting Cu contacts. All films with Zn/Group VI ratio close to 1 showed slight conductivity in the 10-10 ohm-cm range. Layered ZnSexTe1-x Films doped with Nitrogen had targeted^Zn/Group VI ratio of 1, but with a higher Te content. The films were also slightly conductive, in the 10-10 ohm-cm range. The mechanism limiting the doping in all the films seems to be the same.
502
Dissertation (Ph.D.)--University of South Florida, 2006.
504
Includes bibliographical references.
516
Text (Electronic dissertation) in PDF format.
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System requirements: World Wide Web browser and PDF reader.
Mode of access: World Wide Web.
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Title from PDF of title page.
Document formatted into pages; contains 109 pages.
Includes vita.
590
Adviser: Don L. Morel, Ph.D.
653
Super lattice.
Ternary.
Zinc selenide.
Zinc telluride.
Copper selenide.
690
Dissertations, Academic
z USF
x Electrical Engineering
Doctoral.
773
t USF Electronic Theses and Dissertations.
949
FTS
SFERS
ETD
TK145 (ONLINE)
4 856
u http://digital.lib.usf.edu/?e14.1761