Abstract:
Six samples of solar cells were fabrication in this research study by deposited
poly (2-methoxy-5-(2’-ethyl-hexyloxy)-1.4 phenylene) (MEH-PPV) polymer
layer on the indium tin oxide (ITO) glass, and deposited another layer of
dye(Sodium4[2(1hydroxynaphthalen2yl)hydrazin1ylidene]7noxonaphthalene1s
ulfonate(EcrchromBlackT),dibenzothiatricarbocyanineIodideHexadibenzocyaini
45 C33H29N2S2I (DDTTC), tow samples mead by deposited zinc oxide (ZnO),
cupric oxide (CuO)layers. Aluminum (Al) electrode was used to complete the
formation of solar cells. The solar cells were exposed to light and the current and
voltages were recorded to calculate their efficiency. The samples were
characterized by Ultra violet-visible spectroscopy to display absorption spectrum.
The rapid increase of the absorption in the low wavelength and decrease in special
wavelength, referring to electronic transition, and this decrease is continuous with
the decrease of photon energy. The range of absorption beak wavelengths for
CuO +ZnO was obtained at330 nm, for MEH-PPV + DDTTC obtained at (300
nm and 500 nm) respectively.For the purpose of the present study Electronic
transport in the (Six samples of solar cells ) devices is studied via current density
voltage (J-V) curves, taken using a Keithley 2400 source meter by sourcing
voltage across the ITO (positive) and aluminum Al (negative)electrode .the open
circuit voltage Voc is the applied voltage at which the current density is zero under
illumination is determined by the difference between the quasi-Fermi energy
level of the (DDTTC = 2.2 eV ‘ Eriochrome black T = 2.16 eV ‘ Cu O = 2.9 eV
and ZnO = 3.6 eV )and the work function of the Al electrode (4.08 eV)or the
highest occupied molecular orbital (HOMO) level of the MEH-PPV in our
system.
