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Forschungsarbeit

Organic Solar Cells

Von Parisa Khoramh (21.05.2014)

The shortage of energy resources has become one of the global challenges in these days. Today about 21.408 TWh electricity is consumed worldwide, 83% of this energy is provided by fossil energy such as coal, oil and gas. These non-renewable sources will not only terminate in a few years, but also cause irreparable damages to the environment. Therefore it is vital to find an environmental-friendly renewable source of energy. Sunlight, wind, tides, waves, biomass and geothermal heat are among those sources. In recent years, solar energy has been the main focus of several researches due to its abundance, easy accessibility and cleanliness. 

[Bildunterschrift / Subline]: Figure 1: Organic solar cell

Among various solar cell devices, organic photovoltaics (OPV) are one of the most promising devices with various advantages such as flexibility, transparency, lightweight, simple process and cost-effective production. Due to these valuable and attractive features, a great deal of attention has been given to the research and development of higher OPV efficiency over the last few years. However, several drawbacks such as poor power conversion efficiency (PCE) and low stability in comparison to conventional inorganic solar cells have to be solved to ensure a bright industrial future for OPVs.

Several approaches have been introduced in order to increase the efficiency of OPVs, such as using low band gap polymers or tandem structures. Although these methods were successful in the enhancement of OPV performance, they suffer from expensive materials production, or tedious layer-by-layer fabrication. Therefore the large scale fabrications of OPVs using these methods will not be as cheap as expected. Ternary organic solar cells are a new approach to combine the near-IR light absorption of tandem cells with the simple fabrication of single junction solar cells. 

In this work, new synthesized organic materials have been applied as sensitizer to the ternary organic solar cells, in order to expand their light absorption window and therefore their efficiency. The morphology and charge transfer has been also investigated in these systems. Moreover, a well-known ternary system which has been reported several times in the literature was studied, in order to understand the fundamental mechanisms involved in the enhancement of the performance in this system. 

[Bildunterschrift / Subline]: Figure 2: Ternary organic solar cell

mailto: Parisa Khoram
Parisa Khoram
* 1988

Scientific career
  • 2007 - 2011
  • B.Sc in Materials Science and Metallurgical Engineering, Ferdowsi University of Mashhad, Iran
  • 2011 - 2013
  • Elite Graduate Program M.Sc. in Advanced Materials and Processes (MAP)

Scholarships and Awards
  • * Prize from Hans-Wilhelm und Helga Schüßler foundation (2013)
  • * Stipend from Stiftung Industrieforschung (2013)
  • * Scholarship for international students in the final stage of their degree (2013)
  • * MAP scholarship (2011 - 2012)

Publikationen
  • * T. Ameri, P. Khoram, J. Min, C. J. Brabec, “Organic ternary solar cells: A review”, Advanced Materials