THE STUDY OF STRUCTURAL AND ELECTRICAL PROPERTIES OF LEAD SULPHIDE (PbS) THIN FILM DEPOSITED THROUGH CHEMICAL BATH DEPOSITION
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THE STUDY OF STRUCTURAL AND ELECTRICAL PROPERTIES OF LEAD SULPHIDE (PbS) THIN FILM DEPOSITED THROUGH CHEMICAL BATH DEPOSITION
PROJECT TOPICS AND MATERIALS ON THE STUDY OF STRUCTURAL AND ELECTRICAL PROPERTIES OF LEAD SULPHIDE (PbS) THIN FILM DEPOSITED THROUGH CHEMICAL BATH DEPOSITION
ABSTRACT
Lead sulfide (PbS) thin films were prepared on glass substrates at
room temperature by chemical bath deposition (CBD) technique. The
influence of dip times on the lead sulphide (PbS) thin films deposited
on glass slide substrates via chemical bath deposition (CBD) technique
using chemical precursors, nitrate Pb(NO3)2, and thiourea SC(NH2)2, and
sodium hydroxide (NaOH) at room temperature was investigated. The
thicknesses of the layers were measured as the structural property, the
thickness of , and were obtained for the time deposits of 60, 80, and
100 minutes respectively. The charge carrier mobility µ was studied as
the electrical properties and the charge carrier mobility (µ) of , and
for the time deposits of 60, 80 and 100 minutes respectively.
CHAPTER ONE
INTRODUCTION
1.1 Background of the Study
In view of the rapid depletion of existing conventional energy
resources, due to the high rate of consumption the world over, it‟s
obvious that mankind is heading towards an energy crisis. Today energy
consumption per capita is synonymous with the standard of living of a
nation and raise world population, standard of living of developed and
developing nation and the trend towards higher technologies on the
increases. It is evident that our oil wells, the source of the world
well-known major energy resources petroleum will sooner or later dry up.
To avert this impending energy crisis and further meet up with energy
needs of nations, renewable energy technological revolution is the only
answer. (Cosmas, 1989).
Renewable energy source that can be developed include
non-exhaustible energy source such as sunlight, ocean currents, waves,
falling water, wind natural energy stocks whose replenishment is far
greater than projected human use. Of this wide range of energy choice,
sunlight, or solar energy is certainly one of the most attractive. Since
the solar energy is more abundant in the poorer and less developed
countries of the world, it is hoped that if this particular source of
energy is researched into a developed the bridging of the technological
gap between the third world countries and most of the developing
countries is then feasible.
Semiconductor materials are always the focus in material science
due to their outstanding electronic and structural properties and have
potential application in various devices such as light emitting diodes,
single electron transistors, and field effect thin film transistors. In
principle, the electronic and structural properties of semiconductor
materials are tunable by varying their shapes and sizes. So it is one of
the desired goals in material science to have precise control of
the morphology of semiconductor materials. As an important IV-VI
group semiconductor, Lead sulfide (PbS) has attracted considerable
attention due to its small direct band-gap (0.41eV at 300K) and a large
excitation Bohr radius of 18nm. Lead sulfide (PbS) is an important
direct narrow gap semiconductor material with a band gap of 0.4eV and
has a cubic structure. Due to their suitable band gaps, PbS thin films
are extensively used in IR detectors. Thin film of lead sulfide was
establish to have very significant application in the manufacture of
photoconductive infrared detectors, transistors, contact rectifiers,
prisons, lenses, windows and other components of optical system. This
material has also been used in many fields such as humidity,
photography, solar absorption photo-resistance, diode lasers, and
temperature sensors, decorative and solar control coatings.
The chemical bath deposition (CBD) method is attracting
considerable attention, as it does not require sophisticated
instrumentation. It is relatively cheap, simple to handle, convenient
for large area deposition and capable of yielding good quality thin
films (Uhuegbu, 2011)
Thin films of PbS have been prepared with various physical and
chemical thin film deposition techniques, such as chemical bath
deposition (CBD), electro-deposition (ED), chemical spray deposition
(CSP), successive Ionic layer adsorption and reaction (SILAR),
electrochemical atomic layer epitaxy (EC-ALE), atomic layer
decomposition (ALD) and thermal evaporation technique. Among these
different techniques, bath technique is advantageous on account of
suitable method in the country. It also allow a uniform wide area
deposition (Ahuome and Onimsi, 2016).
As I have earlier mentioned, the availability of raw materials is
an important factor in fabricating solar cells for solar energy
conversion. Thin film devices will typically be about 5µm to 50µm thick,
in contrast to bulk devices which are about 150µm to 250µm thick, It
shall be pointed out.
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Lead sulfide (PbS) thin films were prepared on glass substrates at room temperature by chemical bath deposition (CBD) technique. The influence of dip times on the lead sulphide (PbS) thin films deposited on glass slide substrates via chemical bath deposition (CBD) technique using chemical precursors, nitrate Pb(NO3)2, and thiourea SC(NH2)2, and sodium hydroxide (NaOH) at room temperature was investigated. The thicknesses of the layers were measured as the structural property, the thickness of , and were obtained for the time deposits of 60, 80, and 100 minutes respectively. The charge carrier mobility µ was studied as the electrical properties and the charge carrier mobility (µ) of , and for the time deposits of 60, 80 and 100 minutes respectively. .. physics project topics
THE STUDY OF STRUCTURAL AND ELECTRICAL PROPERTIES OF LEAD SULPHIDE (PbS) THIN FILM DEPOSITED THROUGH CHEMICAL BATH DEPOSITION