Biomedical Engineering Reference
In-Depth Information
Fig. 5.1
Schematic diagrams of various quantum dot nanostructures are shown: (
a
) SQD: A single InAs QD layer, L
1
.(
b
) QDM-1: A bilayer QD molecule,
consisting of two identical QD layers, L
1
and L
2
.(
c
) QDM-2: A QD molecule comprised of three identical QD layers, L
1
,L
2
,andL
3
.(
d
) QDM-3: A QD
molecule containing six identical QD layers, L
1
,L
2
,
,L
6
.(
e
) QDM-4: A QD molecule with nine identical QD layers, L
1
,L
2
, ..., L
9
. Each QD layer (L
i
)
consists of a dome-shaped InAs QD with base diameter of 20 nm and height of 4 nm, placed on the top of a 0.5 nm InAs wetting layer. For the QDMs shown in
(
b
)to(
e
), the adjacent QD layers are separated by 4.5 nm thick GaAs spacer layers
...
