Open positions

Master thesis projects in the Organic Photonics and Electronics Group

The light-emitting electrochemical cell (LEC) is an emerging surface-emitting technology that promises novel and important application opportunities. By studying the complex device physics in detail, our research group has been able to improve the LEC performance radically during the last few years. Today we fabricate efficient and stabile devices, which can emit with all visible colors. Besides improving the device performance we have shown that these thin-film devices can be fabricated via a wide range of solution-based techniques, with some resemblance to how printed media are fabricated, which thereby enabled us to use a  diversity of substrate materials, including plastics, paper and textiles.

In addition to LECs, our research group work with organic and perovskite solar cells, often referred to as the future of photovoltaics and clean  energy production, and with driving electronics such as organic transistors.

To intrigue you we have briefly introduced a few project suggestions below, but further discussion on a more detailed outline of the intended project will be necessary before any work can begin. The projects are planned as full-time, 30 ECTS, master thesis projects. Applicants should have adequate education (physics, energy, chemistry, or materials science) and good English skills. Depending on the project, it is highly important that the candidate is able to work independently and reliably, following advice.

Project suggestions

Development of a GUI for an automated custom-built spray-sintering equipment

We have a custom-built spray-sintering system that is used for the fabrication of the different layers in LECs. The operation of the system, however, is to a large extent manual, and requires extensive knowledge of the different parts, and how they are connected. The versatility of the system would be greatly improved if it could be automated and controlled from an easy to use GUI. This project involves the design and implementation of a GUI and the interfaces between hardware and software.

Thermal studies of organic thin-film devices using an infrared camera

Even in ideal LECs and organic photovoltaics (OPVs) some of the applied/incoming power will be lost as heat. To what extent the dissipated heat can explain drawbacks of the materials and/or the structure of the devices, or how the temperature increase in itself affects the device performance, is something we have not yet studied. We want to use an IR-camera for these measurements, and establish what its and opportunities and limitations are. The project includes fabrication of LECs and/or OPVs using the thin-film deposition equipment we have in our labs, temperature measurements on operating devices using the IR-camera, and interpretation of collected data.

Nanomorphology of light-emitting electrochemical cells using scanning electron microscopy

The bulk nanomorphology of LECs is pertinent to the understanding of operation and efficiency of LECs, but most of the imaging techniques that have been used so far (e.g., AFM) are only sensing the surface of the materials. In this project you will investigate the bulk nanomorphology of LECs by cleaving the device vertically and imaging its cross section using scanning electron microscopy at low temperature. The project involves fabrication of test samples, use of the SEM-facilities available via the KBC-platform, and analyses of collected data.

Development of efficient drive scheme for light-emitting electrochemical cells

Both historically and today, most LECs are driven in either a potentiostatic or a galvanostatic mode. Several device-characteristics, e.g., turn-on time, life time and efficiency, are however affected by the way they are driven, and recent studies indicate that a pulsed drive scheme could be better than a static. We want you to design and test various pulsed drive schemes for standard LECs, and develop an optimized driving protocol. The project also involves fabrication of devices for test and analysis of the collected data.

Shelf-time effect on LECs characteristics

In the last years, major improvements of the LECs characteristics, such as efficiency and turn-on time, have been enabled via optimization of the electrolyte system. These improvements have however only been studied directly after device fabrication, and the effects of storage on the device characteristics is not known. We thus want you to determine the effects of shelf-time storage for a range of different LEC devices, as distinguished by the electrolyte selection. The project involves fabrication of devices, collection and analysis of data, and possibly further measurements with IRspectroscopy, AFM, and/or SEM.

Application

For further information on the projects, please contact:

Mattias Lindh, e-mail: mattias.lindh@umu.se
Petter Lundberg, e-mail: petter.lundberg@umu.se
Professor Ludvig Edman, e-mail: ludvig.edman@umu.se

If you want to know what it is like to be a master thesis worker in our group, feel free to contact our most recent student:

Jonas Stenberg, e-mail: jonas_bror_stenberg@hotmail.com

We look forward to receiving your application!


Page Editor: Jenny Enevold

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Contact information

Postal address

The Organic Electronics and Photonics Group

Department of Physics
Linnaeus väg 20
Umeå University
SE-901 87 Umeå

Visiting adress

Fysikhuset, 2nd floor
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