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Nano- and Micro-structures for organic/hybrid photonics and optoelectronics

Robbiano, V; (2017) Nano- and Micro-structures for organic/hybrid photonics and optoelectronics. Doctoral thesis, UCL (University College London). Green open access

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Abstract

In this work I present nano- and micro-patterning techniques useful especially in photonics and optoelectronics. In fact, these structures give the possibility to tailor the photophysical and electrical properties of organic and hybrid active materials, spanning from well-known conjugated polymers, to organo-halaide perovskite that nowadays are gaining a lot of interest due to their high performances in photovoltaic devices. The first part is dedicated to the study of the optical properties of conjugated polymers embedded/infiltrated into photonic crystals. In particular, I will show how it is possible to prepare these composite materials and tune their optical properties. The preparation technique has been improved, leading to a promising simple, widely available and low cost preparation of both organic and hybrid photonic structures. The optical properties have been investigated via both steady-state and time-resolved optical techniques. I believe that results obtained are a valuable feedback for future application such as low-threshold optically pumped lasers. In the second part, I will present the application of nanostructured layers in optoelectronic devices. I will show how nanostructured architectures are used to obtain efficient organo-halide perovskite solar cells. This nanostructure induced an increased light absorption due to a controlled light scattering and a controlled microscopic morphology of perovskite films, opening up a wide range of possible investigations, from charge transport optimization to optical enhancements for photovoltaic, light emitting and lasing devices. Finally, I’ve studied the preparation of nanostructured conductive thin films for flexible transparent electrodes suitable for optoelectronic devices. Furthermore, I’ve observed that by introducing a layer of a polyamine derivative it has been possible to tune the work function of these electrodes, therefore changing (lowering) the injection barriers for charge at the interface between the semiconductor and the electrode.

Type: Thesis (Doctoral)
Title: Nano- and Micro-structures for organic/hybrid photonics and optoelectronics
Event: University College London
Open access status: An open access version is available from UCL Discovery
Language: English
Keywords: Organic semiconductors, Photonic structures, Opals, Rugate filters
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1540869
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