|dc.description.abstract||The study and deployment of solar energy conversion systems are justified on many grounds: environmental, economic, geopolitical, and societal. Collectively, these justifications provide a dynamic and compelling backdrop for the continuing narrative of solar energy.
The energy conversion efficiency of a solar cell is set by the design of the cell and by the properties of the incident sunlight. Thus in addition to works aimed at improving solar cells directly, are those directed towards shaping the solar spectrum incident on the cell, prior to sunlight absorption. So-called spectral management is distinct from, but closely related to, solar cells.
Two such techniques are documented here. The first, luminescent concentration, downshifts energy and concentrates photon flux within a luminophore-doped waveguide. Problems associated with luminescence concentrators are reported, motivating a novel arrangement of the light absorbing centers aimed at ameliorating lossy emission by induced photon anisotropy. We present the first experimentally-realised implementation of the design.
The second portion of work concerns triplet-triplet annihilation upconversion (TTA-UC), a means by which sub-band gap photon losses in solar cells can be reduced. We present schemes for tethering TTA-UC absorbers to nanostructured solids in a bid to increase chromophore concentration and UC efficiency. Kinetic studies of these materials are presented. Results show the formation of heterogeneous structures dependent on the chromophore, binding mechanism and scaffold.
Solar cell enhancement experiments were used to show the enhancement of a H-passivated a-Si solar cell by a solid-tethered upconverter, producing modest gains in short-circuit current. The action spectrum, a novel photoluminescence technique for measuring TTA-UC efficiency, was measured for two materials, and the results corroborated using rate measurements. The action spectrum is a promising new upconversion characterisation method.||en_AU|
|dc.publisher||University of Sydney||en_AU|
|dc.publisher||Faculty of Science||en_AU|
|dc.title||Spectral management for quantum solar energy harvesting: changing the colour of the sun||en_AU|
|dc.type.pubtype||Doctor of Philosophy Ph.D.||en_AU|
|Appears in Collections:||Sydney Digital Theses (Open Access)|