Download - Depletion Sample I-V, PL & PLE
Depletion Sample I-V, PL & PLEDepletion Sample I-V, PL & PLE
Toshiyuki Ihara
’04 07/13
Sample informationSample information• n-type-doped single wire
5_7_04.1(accumulation) 5_7_04.2 (depletion)
#1 Perfect I-V, PL & PLE
#2 Perfect
#3 Perfect – isolated lines practice
#4 Poor – lots of lines
#5 Perfect I-V, PL
#1 Poor – lots of lines
#2 Perfect
#3 Perfect I-V,PL&PLE
#4 Perfect – Scattered lines
#5 Bad
#6 Bad practice
I measured I-V, PL & PLE of sample 5_7_04.2 #3 depletion sample
Red : new
I-V measurementI-V measurement• Sample 5_7_04.2 #3 (depletion)• Gate-earth I-V• No leak current
between ー 0.6~0.3
though I observed
ohmic I-V at 300K
I- V ( gate- earth )
- 4.00E- 07
- 3.00E- 07
- 2.00E- 07
- 1.00E- 07
0.00E+00
1.00E- 07
2.00E- 07
- 1 - 0.5 0 0.5 1
gate voltage (V)
curr
ent
(A)
5K
gate - earth I- V
- 1.00E- 05
- 8.00E- 06
- 6.00E- 06
- 4.00E- 06
- 2.00E- 06
0.00E+00
2.00E- 06
4.00E- 06
6.00E- 06
8.00E- 06
- 0.1 - 0.05 0 0.05 0.1
gate voltage (V)
curr
ent
(A) A- C
A- DB- C
B- D
300K
Wire PL Vg dependenceWire PL Vg dependenceWire PL spectra Vg depen
dence between-0.8V~0.2V
Laser 1μWstem excitation(1.665eV)Reflection geometry
Almost same result as before
60
50
40
30
20
10
0
x103
1.6001.5901.5801.5701.560
a040712006accumulate n- type doped QWR 5-7-04.2 #3 perfect center + 2mt = 10 sT = 3.515 KV = (-0.8) - (0.2)V0.05V steplaser 751nmomec -800NDex 1/ 100, 1/ 1000 (...10W ?)
armwire
X
X-
plasma-0.8 ~ -0.7 Exciton
-0.7 ~ -0.5 Trion
-0.5 ~ 0.1 Plasma
PL scan PL scan ~ ~ sample qualitysample quality0 - 50μm
(1μm step)
Vg : -0.3V or
-0.65V
Laser 1μW
stem excitation
(1.665eV)
Reflection geometry
ML fluctuations or electron density fluctuations !?
50
40
30
20
10
0
x103
1.6001.5901.5801.5701.560
a040712003depletion n- type doped QWR 5-7-04.2 #3 perfect 50m scan1m step (0 - 50m)t = 5 sT = 3.535 KV = -0.3Vlaser 745nmomec -800NDex 1/ 100, 1/ 1000 (...10W ?)
50
40
30
20
10
0
x103
1.6001.5901.5801.5701.560
a040712001depletion n- type doped QWR 5-7-04.2 #3 perfect 50m scan1m step (50 - 100m)t = 5 sT = 3.542 KV = -0.65Vlaser 745nmomec -800NDex 1/ 100, 1/ 1000 (...10W ?)
-0.65V-0.3Varmwire wirearm
Wire PL & PLE Vg dependenceWire PL & PLE Vg dependenceWire normalized PL & PLE spect
ra
Laser / detection : perpendicular
polarization
Excitation : to wire⊥Detection : // to wire
Almost same result as before
PL & PLE of wire
1.565 1.57 1.575 1.58 1.585 1.59
photon energy (eV)
arbi
trar
y un
its.
trion
plasma
laser