Abstract:
This research discussed how use the local materials in the felid of manufacture
semiconductors material by determining the optical and structural properties of
Gum Arabic doped by aluminum oxide made by sol gel and chemo-thermal
methods and to be used in diode multilayers. Four samples of Gum Arabic doping
by aluminum oxide were prepared by sol gel method and other four samples which
were prepared by using chemo -thermal method, after that the multi-layers were
prepared by spin coating technique. The optical properties and structural
parameter were found using UV-vis spectrometer and FTIR and XRD
respectively.
The XRD results showed the crystal structure for Gum Arabic Made by sol gel
method was (Hexagonal- Primitive), while (Cubic – Primitive) for the chemothermal
method .There were different optical properties result for the two method,
for sol gel sample the maximal absorption at wavelength 465 nm corresponding to
photon energy 2.667 eV, and for chemo-thermal sample the chemo-thermal
maximal absorption at wavelengths 576 nm corresponding to photon energy 2.605
eV. An optical conductivity for sol gel sample equal to (9.63x108 Sec-1) at 435 nm
and (9.61x108 Sec-1) at 510 nm, and for chemo-thermal were (9.58x108 Sec-1) at
442 nm and (9.55x108 Sec-1) at 520 nm , the change of optical conductivity at
high photo -generation due to the high absorbance of all samples prepared
according to electron excitation by photon energy. The I-V characteristic results
of diode multilayer carried out it showed the relation between the number of layers
and (Charge Injection Voltage and Turn on Voltage), voltage increases as the
number of layers increases, while the density of current decreases in the two cases
, so the I-V curve which was obtain is similar to the silicon I-V curve.
