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In this work, the influence of the light intensity as one of the parameters that control the solar cell is studied. The effect of the other main variables, such as temperature, rotation per Minuit of the spin coating instrument, and the samples concentration, was found to be in conformity with other results, but unfortunately the intensity of light does not increase the solar cell efficiency, and fill factor, by other words it was found to play only a secondary role.
Solar cells were fabricated
from (Muscovite/ TiO2/Dye/Al), the effect of temperature, concen- tration
and light intensity on the electrical prop- erties of (Muscovite/TiO2/Dye/Al)
was studied. The relationship between current and voltage was found to be algorism,
which is in agreement with the ordinary relation for solar cells. When dye concentration
was increased the conductivity, fill factor and efficiency were also increased.
This result is found to be in conformity with the theoretical relations. The small
energy gaps for their samples show that they are semiconductors. The maximum efficiency
obtained is 33.2%.
Amorphous carbon (a-C) thin films have
been synthesized by microwave (MW) surface wave plasma (SWP) chemical vapor
deposition (CVD) on n-type silicon and quartz substrates, aiming at the application of the films for photovoltaic
solar cells. Argon, acetylene and trimethylboron were used as a carrier, source
and dopant gases. Analytical methods such as X-ray photoelectron spectroscopy
(XPS), Hall Effect measurement, JASCO V-570 UV/VIS/NIR spectroscopy, Raman
spectroscopy, Transmission electron microscopy (TEM) and Solar simulator were
employed to investigate chemical, optical, structural and electrical properties
of the a-C films. Two types of solar cells of configuration p-C/n-Si and
p-C/i-C/n-Si have been fabricated and their current-voltage characteristics
under dark and illumination (AM 1.5, 100 mW/cm2) have been studied.
The two solar cells
showed rectifying curves under the dark condition confirming the heterojunction
carbon based solar cell between p-C and n-Si. When illuminated by the solar
simulator light the devices showed photovoltaic behavior. The heterojunction
device (p-C/i-C/n-Si) having inserted intrinsic carbon film between p-C and
n-Si exhibited significant enhancement of the conversation efficiency (0.167%
to 2.349%) over the device (p-C/n-Si).