NDLI: - III-Synthesis and properties of π-conjugated polymers for organic photovoltaics

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- III-Synthesis and properties of π-conjugated polymers for organic photovoltaics

Content Provider	Semantic Scholar
Author	Kroon, Renee
Copyright Year	2013
Abstract	Organic photovoltaics is a renewable energy technology able to solve global warming and the upcoming energy gap, issues that both originate from fossil fuel consumption. Out of all renewable energy sources, the Sun is the only source that produces enough energy to fulfill all our energy needs, now and in the future. Photovoltaics based on π-conjugated polymers are envisioned to offer a low cost alternative to the present technology, but optimization of the polymer structure is needed to achieve efficiencies high enough to make this technology economically viable. This thesis deals with both the optimization of several parent structures via the process of energy level engineering and establishing structure-property relationships upon alteration of these parent structures. The initial work explored the effect of carbon-silicon exchange on various physical, optical and photovoltaic properties of fluorene/silafluorene-based copolymers. The optical, redox and photovoltaic properties of these polymers remained virtually unchanged except for the thermal behavior. The work was continued by optimizing the energy levels and bandgap of TQ1 with the aim to surpass its already high power conversion efficiency of 6%. Aside from improved spectral coverage and energy level optimization, several interesting structure-property relationships were found. Finally, another well-performing structure, PDPPTPT, was modified with alkoxy sidechains to investigate the effect on various polymer properties. Aside from a redshifted absorption, polymer properties were altered suggesting additional flexibility in the polymer backbone. By comparing polymer and oligomer properties, methoxy substitution seems to initially increase melting and crystallization temperatures, but this trend is then supposedly counteracted due to increased irregularity in the polymer backbone.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://publications.lib.chalmers.se/records/fulltext/173044/173044.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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