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Title: Preparation and properties of P-N molecular junctions
Author: Fearn, Michael James
ISNI:       0000 0004 2741 4705
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2008
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Abstract Over the last few decades there has been a huge interest in the synthesis of novel conjugated small molecules and polymers due to their immense potential in the electronics industry. To date, inorganic based systems have continued to dominate the market. However, there is a growing demand for new low-cost materials for a range of new electronics applications. At the present time, only devices based upon organic light emitting diodes (OLEDs) have begun to demonstrate their capabilities in the commercial market. For other devices such as organic photovoltaic devices (OPVDs) and organic field-effect transistors (OFETs) there are still numerous technical issues that need to be overcome. In order to address issues such as charge transport and charge separation, this thesis focuses on the synthesis and characterisation of novel hole transport (p-type) and electron transport (n- type) materials as well as laying down the foundations for building molecular p-n junctions. The deployment of such molecular p-n junctions could have particularly important implications for OPVDs where charge separation and recombination are fundamentally important processes. Chapter one introduces the reader to the field of organic electronics, and aims to give a broader understanding about the various devices, and the types of semiconductor materials that are important for such applications. Chapter two describes the preparation and characterisation of a small library of simple p and n-type molecules from which subsequent studies will be based. In chapter three, the preparation of novel semiconductor materials based upon symmetrical and asymmetrical [9,9']bifluorenylidenes, ~4,4'-dicyclopenta[2, 1-b;3,4-b']dithiophenes and 1,4-bis(2,2'- biphenylene)-1 ,3-butadienes is discussed, as well as the characterisation of representatives from this group. Chapter four examines the synthesis and characterisation of semiconductor materi- als based around spirobifluorene, and demonstrates how such synthetic strategies can be further applied to the preparation of novel dispirodifluorene semiconductor materials. Finally in chapter five, an overview of the project is presented, as well as some suggestions for future work. This tonn, when completed, should be submitted to EPS GRADUATE SCHOOL, ROOM 843, SACKYILLE sr, UNIVERSITY OF MANCHESTER, MANCHESTER, M60 lQD Page 5 April 2005
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available