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Advanced hybrid solar cell approaches for future generation ultra-high efficiency photovoltaic devices

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Increasing the conversion efficiencies of photovoltaic (PV) cells beyond the single junction theoretical limit is the driving force behind much of third generation solar cell research. Over the last half century, the experimental conversion efficiency of both single junction and tandem solar cells has plateaued as manufacturers and researchers have…

Increasing the conversion efficiencies of photovoltaic (PV) cells beyond the single junction theoretical limit is the driving force behind much of third generation solar cell research. Over the last half century, the experimental conversion efficiency of both single junction and tandem solar cells has plateaued as manufacturers and researchers have optimized various materials and structures. While existing materials and technologies have remarkably good conversion efficiencies, they are approaching their own limits. For example, tandem solar cells are currently well developed commercially but further improvements through increasing the number of junctions struggle with various issues related to material interfacial defects. Thus, there is a need for novel theoretical and experimental approaches leading to new third generation cell structures. Multiple exciton generation (MEG) and intermediate band (IB) solar cells have been proposed as third generation alternatives and theoretical modeling suggests they can surpass the detailed balance efficiency limits of single junction and tandem solar cells. MEG or IB solar cell has a variety of advantages enabling the use of low bandgap materials. Integrating MEG and IB with other cell types to make novel solar cells (such as MEG with tandem, IB with tandem or MEG with IB) potentially offers improvements by employing multi-physics effects in one device. This hybrid solar cell should improve the properties of conventional solar cells with a reduced number of junction, increased light-generated current and extended material selections. These multi-physics effects in hybrid solar cells can be achieved through the use of nanostructures taking advantage of the carrier confinement while using existing solar cell materials with excellent characteristics. This reduces the additional cost to develop novel materials and structures. In this dissertation, the author develops thermodynamic models for several novel types of solar cells and uses these models to optimize and compare their properties to those of existing PV cells. The results demonstrate multiple advantages from combining MEG and IB technology with existing solar cell structures.
ContributorsLee, Jongwon (Author) / Honsberg, C. (Christiana B.) (Thesis advisor) / Bowden, Stuart (Committee member) / Roedel, Ronald (Committee member) / Goodnick, Stephen (Committee member) / Schroder, Dieter (Committee member) / Arizona State University (Publisher)
Created2014
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Hybrid Judaism: Irving Greenberg and the encounter with American Jewish identity

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Over the course of more than half a century, Rabbi Dr. Irving Greenberg has developed a distinctive theology of intra- and inter-group relations. Deeply influenced by his experiences in the Christian-Jewish dialogue movement, Greenberg's covenantal theology and image of God idea coalesce into what I refer to as Hybrid Judaism,…

Over the course of more than half a century, Rabbi Dr. Irving Greenberg has developed a distinctive theology of intra- and inter-group relations. Deeply influenced by his experiences in the Christian-Jewish dialogue movement, Greenberg's covenantal theology and image of God idea coalesce into what I refer to as Hybrid Judaism, a conceptualization that anticipated key aspects David Hollinger's notion of Postethnicity. As such, Greenberg's system of thought is mistakenly categorized (by himself, as well as others) as an expression of pluralism. The twentieth century arc of social theories of group life in America, from Melting Pot to Postethnicity by way of Cultural Pluralism, serves to highlight the fact that Greenberg is better located at the latter end of this arc (Postethnicity), rather than in the middle (Pluralism). Central to Greenberg's proto-postethnic theology is the recognition of the transformative power of encounter in an open society. Greenberg's ideas are themselves the product of such encounters. Understood fully, Hybrid Judaism has great relevance for American Jewish identity in the twenty-first century.
ContributorsKleinberg, Darren, 1976- (Author) / Gereboff, Joel (Thesis advisor) / Fessenden, Tracy (Committee member) / Moore, Moses (Committee member) / Arizona State University (Publisher)
Created2014