KEYWORDS: Zinc, Heterojunctions, Electroluminescence, Thin films, Thin film devices, Scanning electron microscopy, Organic light emitting diodes, Nanostructures, Nanolithography, Electron transport
Organic/inorganic heterostructure ITO/poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEHPPV)/
ZnS/Al devices were fabricated. The effects of different nanostructural ZnS thin films on the characteristics of the
devices were studied in detail. Different nanostructural ZnS thin films were prepared by glancing angle deposition
(GLAD) technology. ZnS films were deposited on pieces of indium tin oxide (ITO) substrates coated with MEH-PPV in
an electron beam evaporation system when the oblique angle was set to 0° and 80° respectively. During the deposition
process, the base pressure of vacuum chamber was 3×10-4 Pa, the deposition rate was fixed at 0.2 nm/s and the rotation
rate of the substrate was 0.05 rev/s. Scanning electron microscope (SEM) images show that ZnS nanocrystalline films
were formed on the substrates at different oblique angles, but the nanocolumnar structure was only formed at the
situation of α=80°, and a continuous and uniform ZnS thin film was obtained at 0°. The electroluminescence (EL)
intensities of the organic/inorganic heterostructure devices were enhanced compared with the single-layer devices, and
the device with the nanocolumnar ZnS layer showed higher emission intensity compared with the one composed by the
continuous ZnS film deposited at normal incidence under the same driving voltage. The different nanostructural ZnS
films were found to have direct effects on the electrical and luminance characteristics of the organic/inorganic
heterostructure devices.
Photoluminescence (PL) and photovoltaic (PV) performance of poly3-octylthiophene (P3OT) and poly3-alkylthiophene
(P3DT) were studied in detailed. The two kinds of polymer can exhibit strong deep red emission peaking at 688 nm for
P3OT and 675 nm for P3DT under blue light excitation, the effective excitation wavelength is about 462 nm. The
dynamic process of exciton induced by light excitation strongly determined the PL and PV characteristics. From the PL
excitation spectra of P3OT and P3DT, it can be seen that there are wide and intense excitation wavelengths in the visible
light range. Two kinds of polymer solar cells based on P3OT or P3DT doping with PCBM were fabricated and the
characteristics of OPVs were measured, the short current density (Jsc) and open circuit voltage (Voc) are 0.84 mA/cm2,
0.95 mA/cm2 and 180 mV, 270 mV, respectively.
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