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• W1501400252 abstract "There is a pressing need to find alternatives for polluting and often non-sustainable fossilfuels. An obvious alternative energy source is the sun, which sends more than enoughenergy to Earth to satisfy mankind’s (current) demands. Modern commercial solar celltechnology is still mainly based on silicon, which has to meet very high purity standardsand is therefore expensive relative to fossil fuels. A viable alternative could be dye sensitizedsolar cells (DSCs), which operate with the much cheaper semiconductor titanium dioxide(TiO2). Since the light is absorbed by a dye rather than the bulk semiconductor materialitself, a DSC is much more versatile then a silicon based solar cell. This thesis discusses the development of dye sensitized solar cells in terms of semiconductor fabrication as well as dye development. Several types of dye sensitized solar cells have been fabricated and testedfor various copper(I) and ruthenium(II) dyes. The emphasis was on solid state dye sensitized solar cells (ssDSCs) since liquid electrolyte type DSCs (leDSCs) have a stability disadvantagedue to possible leakage and evaporation. SsDSCs rely on a solid hole conductor for charge transport rather than on a liquid electrolyte and charge transport is more dependent on chargehopping through the hole transport material (HTM) than on diffusion of charge carrying ions,like in leDSCs. Among the top performing dyes today are often transition metal complexes basedon ruthenium, one of the standards being the ruthenium(II) dye N719. All cell development partsof this thesis (Chapters 3-5) have been almost exclusively conducted with this dye. Since rutheniumis not very abundant in the Earth’s crust compared to other metals, the focus in dye development was laid on the cheaper transition metal copper in the last chapter. Chapter 1 gives a general introduction about energy needs of mankind and why we need to find alternative ways of saturatingthem. Chapter 2 gives an overview of the methods and materials used for solar cell fabricationand characterization. In Chapter 3, liquid electrolyte DSCs (leDSCs) based on an iodide/triiodideredox electrolyte have been fabricated and optimized with home made TiO2 particles and layers. Not only the bare electrodes, but also scattering layers, whose function it is to retain thelight longer in the DSC itself, have been fabricated and tested. Chapter 4 contains celldevelopment on ssDSCs based on copper(I) iodide (CuI) as the HTM. In Chapter 5, ssDSCsemploying polyethylenedioxythiophene (PEDOT) as the HTM have been assembled and tested for performance. In Chapter 6, several copper(I) metalorganic complex dyes incorporating back to back ligands have been tested for leDSCs and PEDOT ssDSCs. Those dyes have been comparedto the standard ruthenium dye (N719) in cell performance. Chapter 7 Is the conclusion of this thesis.Experimental and specific cell fabrication details are included in each chapter separately." @default.
• W1501400252 created "2016-06-24" @default.
• W1501400252 creator A5042503840 @default.
• W1501400252 date "2015-01-01" @default.
• W1501400252 modified "2023-09-28" @default.
• W1501400252 title "Dye sensitized solar cells : from liquid electrolytes to solid state hole transport materials" @default.
• W1501400252 doi "https://doi.org/10.5451/unibas-006344820" @default.
• W1501400252 hasPublicationYear "2015" @default.
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