r&d of ir detectors and emitters · title: r&d of ir detectors and emitters author:...
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L a b Quantum Nano Engineering Lab 4/3/20160 Quantum Nano-Engineering Lab
Dipole moment
L a b Quantum Nano Engineering Lab 4/3/20161
Our Goal for VIS/IR Detectors
• Simple to produce - Wet chemistry
• Flexible – Controlled by wavelength/substrate
• Cheep –Organic molecules/NCs/detector
L a b Quantum Nano Engineering Lab 4/3/20162
Infrared Applications
SWIR MWIR LWIR
InSb
InAsSb
Nano-dots: PbSe, HgCdTe
Nano
Crystals
Quantum wells HgCdTe
Atmospheric windows
Mobile phones (simple IR camera)Medical
Low end Infra-red detectors
1.7-2.5 µm 3-5 µm
L a b Quantum Nano Engineering Lab 4/3/20163
Existing IR Detectors
Interband transitions in PN junctions
Deeply cooled - heavy
Sophisticated layer structure
Intra-band transitions n-doped wells
Cooled
Expensive
3-5 microns, 8-12 microns
Quantum-Well IR Photodetectors
Bolometers
Uncooled
Expensive
Specific range of wavelengths
(VOx, amorphous Si)
L a b Quantum Nano Engineering Lab 4/3/20164
1) The need is growing:
2) The non military uncooled
thermal camera market is
growing, which means there is
a growing market for simple low
end RT thermal arrays:
Basic Facts
L a b Quantum Nano Engineering Lab 4/3/20165
GaAs
GaAs semi-insulating substrate
5nm
50nm
AlGaAs semi-insulating
Aun-GaAs
+
_
+++++ +
_ _ _ _ _ _
1064
intensity 500
1
100bias
nm
mW
beamdiameter cm
V mV
Device schematics: SAM linked gate
Charge transfer
through the organic
monolayer.
The trapped
charge effects the
channel and
changes the
conductivity.
L a b Quantum Nano Engineering Lab 4/3/20166
FET transistor with nanodots
acting as a light gate
1000 1250 15000.00
0.05
0.10
Sample with NP
Reference
Re
sp
on
se
[A
/W]
Wavelength [nm]
Solution absorption Ab
so
rptio
n [
a.u
]
Appl. Phys. Lett. 92 223112 (2008).
High Sensitivity to Light
Highly sensitive detector:
photoresponsivity of
A. Neubauer, S. Yochelis, Y. Amit, U. Banin, Y. Paltiel,
Sensors & Actuators A: Physical, 229, 15, 166-171 (2015)
610V
W
1E-13 1E-10 1E-710
5
106
R
esp
on
siv
ity [
V/W
]
Light intesity [W/cm^2]
(a)
InAs QDs
L a b Quantum Nano Engineering Lab 4/3/20167
System II: Printed Detectors
QD
Light
-
+
In collaboration with Prof. Shlomo Magdassi, HUJI
Tunable inkjet printed hybrid carbon
nanotubes/nanocrystals light sensor
E. Katzir, S. Yochelis, Y. Paltiel, S. Azoubel, A. Shimoni, S.
Magdassi, Sensors and Actuators B, 196, 112–116 (2014)
1) Light is absorbed in multiwall
carbon nano tubes (MWCNT)
and nano crystals (NCs).
2) The light that is absorbed by the
NCs changes the conduction of
the channel by induced dipole.
L a b Quantum Nano Engineering Lab 4/3/20168
Estimated costsThere is a need for simple 1.7 – 2.5µm
3-5µm room temperature arrays
• Doped nano particles for 100% absorption efficiency 1-10
$/m2.
• Printed sensor gold 1000$ for A4 sheet.
• Carbon NT 50$ per A4 sheet.
• Printed FET like detectors 1 $/m2.
• Estimated final cost per array few $.
L a b Quantum Nano Engineering Lab 4/3/20169
Summary
• Controlled wavelength VIS to MWIR
• Simple to produce
• Flexile substrates
• Cheap
0 50 1000
10
20
30
40
520nm highpass filter
290K
1mA
Response [m
V/W
]
Time [ms]
100nm