The boiler must be designed properly to prevent oil accumulation.
The solar boiler will typically never get hot enough to be damaged.
The process of charge transport is fundamental to the operation of all electronic devices. In organic photovoltaics, high efficiencies can only be achieved if charge transport is able to extract charge carriers from the active layer with minimal recombination losses. This work presents new insights into the measurement of charge transport, the underlying physics, as well as new approaches for modelling. Numeric simulation software using a drift-diffusion-recombination model is developed and applied to organic photovoltaic devices. Specifically, this model is used to design and interpret charge transport experiments that are applicable to operational organic solar cells.Charge carrier mobility is studied using photogenerated charge extraction by linearly increasing voltage (photo-CELIV) and the novel technique of resistance-dependent photovoltage (RPV). These experiments demonstrate the absence of "hot carrier" relaxation effects on the timescales of charge transport in several organic photovoltaic polymer:fullerene blends. This is surprising because it has previously been argued that such relaxation is the cause of the deterimental dispersive transport that affects many organic semiconductor devices. It is argued instead that dispersive transport arises from the loss of carriers to trap states. Next, the techniques are extended to recombination measurements, where the recombination coefficient in a benchmark polymer:fullerene system is found to depend upon the polymer's molecular weight.Modelling of the steady-state photocurrent produced by a solar cell demonstrates the conditions under which non-geminate recombination may be avoided, and presents a design rule for avoiding non-geminate recombination. Experimental measurements on devices of varying thickness support the conclusion that the space-charge limited current is a fundamental threshold for high-efficiency photocurrent extraction.Finally, fractional kinetics and generalised diffusion equations are explored. We show that the Poisson summation theorem permits the analytic solution of a fractional diffusion equation to be collapsed into closed form. Subsequently, these techniques are applied to a new type of kinetic model that is capable of unifying normal and dispersive transport within a single framework.
Organic Solar Cell Phd Thesis On Project
ORGANIC BULK-HETEROJUNCTION PHOTOVOLTAIC - pdfEnhancement of P3HT:PCBM solar cells containing scattering Zn-Al hydrotalcite For this reason, in this thesis, the type of organic photovoltaic active BHJA Thesis entitled Schottky behavior of organic solar pdfMake the organic solar cells inferior to silicon solar cells In this thesis, the effect of Devabhakthuni for serving on my thesis committee I thank the University ofThe Fabrication and Characterization of Organic Solar pdfMay 2009 Abstract Organic solar cells hold promise for low cost energy production, but only if further This thesis looked at one combination of materialsDevice Physics of Organic Solar Cells - Qucosa pdfDevice Physics of Organic Solar Cells Drift-Diffusion Simulation in Comparison with Experimental Data of Solar Cells Based on Small Molecules DissertationOrganic Solar Cell Architectures - Homepage of Klaus pdfOrganic Solar Cell Architectures PhD Thesis by Dipl Ing Klaus Petritsch presented to the Technisch-Naturwissenschaftliche Fakultt der TechnischenSynthesis and Characterization of P3HT:PCBM Organic Solar pdfSynthesis and Characterization of P3HT:PCBM Organic Solar Cells Jenna deBoisblanc Advisors: Dr David Tanenbaum and Dr Alma Zook Senior Thesis