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Title: Pattern replication in organic-inorganic hybrid materials
Author: Nedelcu, Mihaela
ISNI:       0000 0004 5364 5574
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2014
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The goal of the work presented in this thesis, was to develop inorganic material systems synthesized via organic precursors and to pattern them using different lithographic techniques. The materials investigated were the ferromagnetic Ni metal and the mesoporous TiO2 and Nb2O5, which have applications in dye sensitized solar cells. The first part of the thesis presents an overview of pattern formation in organic and inorganic materials and the working principles of dye sensitized solar cells. Next the theoretical background of block-copolymer and block-copolymer structure directing hybrid materials are described. Fundamental knowledge of magnetism and ferromagnetism are also presented. The techniques used to characterize the material and the fabricated devices are detailed. For example, the samples were characterized using magnetic force microscopy (MFM) and scanning electron microscopy (SEM), while the materials were characterized by BET. The fabrication of Ni metal films using sol-gel process is then discussed. The Ni metal films were patterned with sub-10 nm wide lines via direct-writing electron beam lithography, and their electrical resistivity was investigated. The in uence of mesoporous TiO2 obtained using a block-copolymer, which acted as a structure-directing agent for the metal oxide, is then presented. This material was incorporated into solid state dye sensitized solar cells. The development of a mesoporous material fabrication protocol, which has significantly in uenced solar cell efficiency, is discussed. Finally the general ideas and some preliminary results on a mesoporous Nb2O5 material and its application in dye sensitized solar cells are presented.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral