Surface modification of electrodes becomes a powerful process to improve the performance
of organic electronic devices such as organic light emitting diodes (OLEDs)
and organic photovoltaic cells (OPVs), boosting their further commercialization. Effective
improvement can be achieved by introducing several types of nanoparticles
onto the electrodes. Magnetic fields also have influence in the organic electronics,
due to charge transport mechanisms of organic semiconducting materials. Therefore,
magnetic nanoparticles are of particular interest.
Magnetic γ-Fe2O3 nanoparticles have been produced using diblock copolymer reverse
micelles method. The processes were elucidated in detail by Raman spectroscopy
to reveal the iron oxide evolution. Compositional and structural information of individual
γ-Fe2O3 nanoparticles were also characterized thoroughly by transmission
electron microscopy (TEM) equipped with energy-dispersive X-ray spectroscopy (EDX)
and electron energy loss spectroscopy (EELS), while their magnetic properties of the
nanoparticles arrays were also evaluated by superconducting quantum interference
device (SQUID) magnetometer. The low temperature annealing process was developed
to facilitate the incorporation of γ-Fe2O3 nanoparticles in practical devices. Introducing
γ-Fe2O3 nanoparticles onto the anode of basic OPV devices showed a positive
effect on performance during the preliminary test.
By using several methods, dispersion of γ-Fe2O3 nanoparticles can be tuned, examined
by disLocate which is a comprehensive suite of tools for quantitative dispersion
analysis. Additionally, the size of the nanoparticles can be changed simply by changing
the loading ratio of FeCl3 below the maximum loading which was determined by
quantum mechanical mapping using atomic force microscopy (AFM-QNM). With
high control in terms of size and dispersion, the magnetic γ-Fe2O3 nanoparticles are
ready to be employed to study the surface modification and magnetic effect on organic
electronic devices. / Thesis / Master of Applied Science (MASc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/22833 |
| Date | 06 1900 |
| Creators | Kunyu, Liang |
| Contributors | Ayse, Turak, Engineering Physics |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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