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Identifier

000392820

Title

Development of photosensitive nanostructured hybrid devices

Alternative Title

Ανάπτυξη φωτοευαίσθητων νανοδομημένων υβριδικών διατάξεων

Author

Στυλιανάκης, Μηνάς Μ.

Thesis advisor

Αναστασιάδης, Σπύρος

Abstract

The extraordinary mechanical, electric and optical properties of graphene and its derivatives, along with the need for low-cost and solution-processed materials, ideal for electronic applications, have experienced particular attention in global scientific research, over the past decade. Graphene-based nanostructured materials appear to be attractive alternatives in a range of new energy devices, including organic photovoltaic cells, lithium batteries, fuel cells and supercapacitors. In organic photovoltaic applications, graphene-based materials have been introduced as transparent conductive electrodes (TCE), buffer layers, as well as electron donor/acceptor materials to improve the architecture and the photovoltaic performance, replacing the conventional existing materials. Therefore, new insights into “graphene chemistry” have been rapidly developed, leading to novel graphene derivatives, by innovative synthetic routes and new fabrication methods. Graphene-based OPVs seem to be perspectives, due to their promising and appealing properties, reaching to comparable or higher efficiencies to the traditional OPVs, which are summarized to an exponentially growing literature. In this thesis, novel graphene-based materials have been designed and synthesized for bulk heterojunction (BHJ) photosensitive nanostructured hybrid devices development. The resulting graphene-based materials have been incorporated into the photoactive layer of OPV devices and have been applied as electron-acceptor materials, replacing the most used fullerene derivative PC₇₁BM and moreover have been used as electron-cascade donor materials, constituting the third component to a ternary organic blend, along with polymer/fullerene composites. Finally, the structures of the graphene-based materials used, as well as the optimization of the fabricated OPVs have been evaluated by utilizing various spectroscopy and microscopy analyses, alongside with complementary photovoltaic measurements.

Language

English

Subject

Bulk heterojunction

Chemical functionalization

Energy levels

Graphene

Organic photovoltaics

Oxidation - Reduction

Power conversion efficiency

Γραφένιο

Διεσπαρμένη ετεροεπαφή

Ενεργειακά επίπεδα

Οξείδωση - αναγωγή

Οργανικά φωτοβολταϊκά

Υλικό δότης / δέκτης ηλεκτρονίων

Χημική τροποποίηση

Issue date

2015-07-10

Collection

School/Department--School of Sciences and Engineering--Department of Chemistry--Doctoral theses

Type of Work--Doctoral theses

Views

534

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