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Title: Metal window electrodes for organic photovoltaics
Author: Stec, Helena M.
ISNI:       0000 0004 2749 4848
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2013
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The work presented in this thesis focuses on the development ultra-thin metal film electrodes for organic photovoltaics (OPVs) with the aim of boosting device performance, lowering the cost and/or extending the range potential application. Chapter 1 gives a general overview of OPVs, including the materials used for their fabrication and the fundamental processes underpinning OPV’s operation. The experimental techniques and equipment used are described in Chapter 2. Chapter 3 describes the development of a solvent free method for the fabrication of highly transparent ultra-thin Au films on glass based on co-deposition of a mixed molecular adhesive layer prior to Au thermal evaporation. By integrating microsphere lithography into the fabrication process the transparency could be improved via the incorporation of a random array of micron-sized circular apertures into the film. In Chapter 4 it is shown that these films are amenable to rapid thermal annealing to realise highly crystalline window electrodes with improved transparency and conductivity. By capping these films with a very thin transition metal oxide layer their thermal stability can be dramatically improved, whilst at the same time improving their far field transparency. In Chapter 5 the molecular adhesive method for the fabrication of ultra-thin Au films on glass is translated to the technologically important flexible substrates and extended to the lower cost coinage metals Ag and Cu. In Chapter 6 a lithography-free approach to fabricating thin Au and Ag films with a dense array of sub-wavelength apertures is reported. These electrodes support surface plasmon resonances which couple strongly with visible light concentrating it near to the electrode surface, thereby increasing light harvesting. Chapter 7 shows how the electrodes developed in Chapter 3 can be used to investigate a fundamental question of importance in OPV research and indicates the direction of future work. The results of chapters 3, 5 and 6 have been published in peer reviewed scientific journals.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry ; TK Electrical engineering. Electronics Nuclear engineering