BO GIAO DUG
VA
OAO
TAO
DAI HOC
QUOC GIA
HA
NOI
TRLTCJNG
DAI HOC KHOA HOC
TlTNHIEN
-oOo-
Le
Thi Thanh
Birth
Che
tao va nghien
cihi
mot
so tinh
chat cua cac mang
mong ban
dSn
dung dich ran A B
Chuyen
nganh:
Vat
ly Dien tijf
J
LUAN
AN PHO TIEN SI KHOA HOC TOAN - LY
OC
rON'-
'-:••:)'•
MAf.OI;
NGUdl
HU^6NG
DAN
KHOA HOC
l.GSPTSLeKhacBinh
2.
PGS PTS Nguyen Ngoc Long
HA NOI -1996
MUC LUC
Mord^u
1
Chirang
1. CAC HOP CHAT BAN DAN
ZnS,
CdS vA CAC DUNG DICH RAN
BAN DAN
Zn,Cd,.,S
5
1.1.
Cft'u
true dnh
thi
cua ZnS va CdS 5
1.1.1
CS^u
tnic mang
lap phuong
gia kem 5
1.1.2
C^u
tnic mang
luc gidc
Wurtzite 6
1.1.3
Mang tinh the
ZnS
va
CdS 8
1.2.
Ca'u
tnic
vising nSng lupng
cua ZnS va CdS 10
1.2.1
Ca'u
tnic viing nang lupng
ciia
mang
I^p
phuong 10
1.2.2
Ca'u
true virng nang lupng cua mang
luc
giac Wurtzite 12
1.2.3 Viing nang lupng cua ZnS va CdS 13
1.3. Tinh
ch^t
h^p
thu
ciia
ban
dSn
15
1.3.1 Khai niem chung 15
1.3.2
Ha'p
thu
chuyin
ddi thang 17
1.3.3
Ha'p
thu chuyin ddi nghieng 18
1.4. Cac
cach^'phat
huynh quang trong ban
dan
20
1.4.1 Khai niem chung 20
1.4.2 Mo hinh
tpa
dp cau hinh 21
1.4.3 Tai hop
viing
-
viing
25
1.4.4 Tai hop buc xa qua cac trang thai exciton 28
1.4.5 Chuyin ddi vung - tap
ch^t
33
1.4.6 Chuyin ddi
done
- axepto 35
1.5.
Mdt
s6 phuong phap
ch^'tao
tinh
thi
va mang dung dich
thi
37
1.5.1
Cdc
phuong phap
klo
dan tinh the 37
1.5.2 Cac phuong phap che tao mang dung dich ran 38
1.6. T6ng quan
v^
dung dich ran
Zn^^Cdi.j^S
39
1.7.
K6t luan
41
Chirang 2. KY THUAT
THl/C
NGHIEM 43
2.1.
He tao
mang 43
2.1.1
L6
44
2.1.2
Bpgamau
44
2.1.3
He thdng
vdi phun,
khi
nen 45
2.2.
Ha bdc bay chan
kh6ng
45
2.2.1 Bom chan khdng 45
2.2.2 Buong hoc bay 45
2.2.3 Ngudn bdc bay 47
2.2.4
D^bdc
bay 47
2.3.
He
do
phd
huynh quang va
phd
truyen qua
47
2.3.1
He
do
phd
huynh quang
47
2.3.2
He
do ph6
truyen
qua
50
2.3.3 Cac phep do khac
51
2.4.
K^
luan
51
Chuong3.
CHE TAO VA NGHIEN
CLTU
CAU TRUC CUA
MANG
Zn^Cd,.,S
53
3.1.
Tao mang
Zn^^Cdj.^S
bang phuong phap phun dung dich
len
de'ndng 53
3.2. Anh hudng cua nhiet dd
d^d^n
ch^t
lupng
m^ng
55
3.3.
Ch^d6
u mang 60
3.4.
Che^dOphatap
61
3.4.1 Phuong phap
nhiing
mang vao dung dich mudi
tapcha'trdi
ii
d
nhiet dp cao 61
3.4.2 Phuong phap hda dung dich mudi tap chat cung vao dung dich phun
nen
63
3.5.
Tao dien
cue
trong sudt
Sn02
va
l^m
dien cue ohmic len mang
Zn^^Cdi.^^S
66
3.6.
Che'tao
mau
Zn^Cd^.^S
bang phuong phap diing
Id
vi song 68
3.7. Ph6
nhilu
xa tia X ciia
mtlng Zn^Cdi.,S
70
3.8.
Anh
bfe
mat cac mang
Zn^Cd^^^S
chup bang
kinh hiln
vi dien tu 73
3.9.
Ka
luan 75
Chirang 4. TINH CHAT QUANG vA HUYNH QUANG CUA
MANG
Zn.Cdi ,S
KHONG PHA TAP 78
4.1.
Tfnh
cha't quang cua mang
Zn^Cd].xS
78
4.1.1 Ph6
hSp
thu cua mang
Zn.Cdi.^S
78
4.1.2
X^c
dinh
d6 r6ng
viing ca'm cua cac mang
Zn^^Cdi.^S
80
4.2.
Huynh quang ciia
cdc
mang
Zn^Cdi.^S
khdng pha tap 82
4.2.1 Dang
phd
huynh quang 83
4.2.2 Su phu
thudc
ciia
dinh
ph6 huynh quang theo thanh phan x 86
4.2.3 Pho huynh quang phan giai thai gian, su phu thupc
ciia
pho huynh quang
v^o
cudng dd
kich
thich.
Thdi
gian
sdng
huynh quang 87
4.2.4 Anh hudng
ciia che'dd li
nhiet len huynh quang
ciia
mang
Zn^Cdj.^S
91
4.2.5 Su phu thudc nhiet dd cua
ph6
huynh quang cua cac mang
Zn^Cdj.^S
92
4.2.6
Co
che'
biic
xa cap dono - axepto trong
phd
huynh quang cua mang
Zn^Cdi.^S
khdng pha tap 94
4.2.7 Hien tupng quang hda ciia mang
Zn^Cd,,^S
99
4.3.
K^
luan 105
Chirang 5. HUYNH QUANG CUA CAC
MANG
ZnxCd,.xS PHA TAP
Cu
VA
Mn 106
5.1.
Phd
huynh quang ciia
m^g
Zn^Cdi^^S
: Cu 106
5.1.1 Dang pho huynh quang. Anh hudng cua
sir
pha lap ddng
len
pho huynh quang 106
5.1.2 Ph6 huynh quang cua mang
Zn^Cdj ^SiCu
vdi cac thdng sd thanh phan x khac
nhau....=...
109
5.1.3 Ph6 huynh quang cua mang
Zn^^Cdi.^S
: Cu khi
kich thfch
lien tuc
vdi cac cudng dp khac nhau va
a
cac
nhiel
do khac nhau
111
5.1.4 Ca
che'
biic
xa ciia dai sdng dai trong
phd
huynh quang cua mang
Zn^Cd,.^S:Cu
113
5.1.5 Tach ph6 huynh quang
114
5.2.
Phd
huynh quang ciia mang
Zn^Cdi^^S
: Mn
117
5.2.1 Dang
phd
huynh quang. Anh hudng ciia su pha tap len ph6 huynh quang
117
5.2.2 Pho huynh quang
ciia
mang
Zn^Cdi.^S
: Mn vdi cac thong sd thanh phan
x khac nhau 120
5.2.3
Sir
phu
ihupc
cudng dp
kich
thfch va nhiet dp cua pho huynh quang
ciia
mang
Zn^Cdi.,S
: Mn 121
5.2.4 Ca
che'biic
xa ciia dai song dai trong pho huynh quang cua mang
Zn^Cdi.^SrMn
123
5.3.
K^
luan 124
Ket
luan 126
Cac cong trinh khoa hoc lien quan den luan an 129
Danh muc tai lieu tham khao 131
DANH
SACH CAC
Kt HIEU StTDLNG
TRONG LUAN AN
a
<7i
e
X
M
11
T
d
hv
k
m*^.
m*h
Hi
^
X
D-A
E.A
ED
E,,,
Eg
Ei
Ep
R
SA
SD
Td
1
J
'W
w^.
- he sd'ha'p thu
- tie't dien
ha'p
thu ciia
tam
i
- hang sd
dien
moi
ciia
cha't ban
dSn
- budc sdng anh sang
- khdi lupng rat gpn
ciia
exciton
- ndng dp tap cha't
- thdi gian sdng huynh quang
ciia
mang
- dd day
ciia
mang
- nang lupng photon
- vecta sdng ciia dien
tii
- khdi
luomg
hicu
dun^
cua dien
tix
- khdi lupng hieu dung
ciia
16 trong
- mat dp trang thai i
- vecta sdng cua phonon
- thanh phan Zn trong mang
- dono - axepto
- nang lupng ion hda axepto
- nang lupng ion hda dono
- nang lupng
dinh
huynh quang
- nang lupng viing ca'm
- nang lupng dien tir d trang thai i
- nang lupng phonon
- he sd phan xa
- dai tu
kich
boat
- dai sdng dai
- nhiet dp de'
- nhiet dp do
- cudng dp
kich
thfch
- ban dp rpng dai pho
- xac sua't chuyen ddi
biic
xa cap D-A