Quantum Dot Sensitized Solar Cells Thesis

Quantum Dot Sensitized Solar Cells Thesis-19
• analysing the effects of varying concentrations of the reduced (Fe(CN)6^4-) and oxidised (Fe(CN)6^3-) species in a ferrocyanide/ferricyanide electrolyte on the performance of a Cd S QDSSC.• identifying the most influential factors on the output of a Cd S QDSSC using the Matlab software for optimised fitting of a theoretical vs.

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The main research questions addressed in this thesis are: • What are the alternative ways of controlling and handling QDs and how these handling conditions affect QD's ageing?

• How will ferrocyanide/ferricyanide redox electrolyte affect the interfacial charge transfer kinetics in a Cd S QDSSC?

The most common method of harvesting solar energy is through photovoltaic (PV) technology in which next-generation PV technologies are vastly becoming popular due to limitations in the mainstream solar PVs i.e. One of these next-generation PVs is the quantum dot sensitised solar cell (QDSSC), the focus in this thesis.

Quantum dots (QD) which are semiconductor nanomaterials used as sensitiser in QDSSCs, are physically very small in size, usually below 10 nm.

Because of this minuteness the QD's optical and electronic properties differ from those of its bulk material's properties, such that it will absorb/emit light usually from the visible to infrared wavelength in the solar spectrum.

In addition, these properties can be controlled by tuning the parameters during synthesis, opening up a number of applications in biotechnology, electronics, photovoltaics, and quantum computing.• Studying the interfacial charge transfer kinetics and transport of a Cd S QDSSC via controlling the reduced and oxidised species of redox electrolyte.• Writing an algorithm in Matlab using a single diode equation for solar cell simulation and another algorithm to simulate the sensitivity of the fitted parameters. Size engineering studies should be extended to much larger QD sizes and temperature and molar ratios being the parameters to focus on still.• To what extent does a ferrocyanide/ferricyanide electrolyte with optimised concentrations improve the overall QDSSC performance?These questions were answered by: • Synthesising and characterising quantum dots (using Pb S as model) by using established and modified parameters.This thesis focuses on the photovoltaic application of QDs specifically investigating the liquid junction QDSSC.There have been previous studies focusing on the components such as electrode, sensitiser, counter-electrode, and limited studies on electrolyte.Plasmonic effects were tapped for improving solar cell responses, by integrating Au microfibers with Cd S/Ti O2 electrodes.This work was further extended by combining this plasmonic photoanode with an electrical double layer capacitor based on multiwalled carbon nanotubes (MWCNTs).Apart from the use of carbon nanostructures, another concept, FRET, was also exploited in this work to realize improved efficiencies in QDSSCs.An electrode tethered QD assembly of Zn S/Cd S/Zn S was used as the donor and copper phthalocyanine (Cu Pc) molecules dissolved in the electrolyte were used as the acceptors.

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