Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 42: Organic Electronics and Photovoltaics I (Joint session of CPP, DS, HL and O, organized by CPP)
HL 42.1: Vortrag
Dienstag, 8. März 2016, 14:00–14:15, H37
Elucidating the Morphology of Organic Bulk Heterojunction Solar Cells Using Nanoanalytical Transmission Electron Microscopy — •Stefanie Fladischer1, Tayebeh Ameri2, Christoph Brabec2, and Erdmann Spiecker1 — 1FAU, CENEM, Erlangen, Deutschland — 2FAU, i-MEET, Erlangen, Deutschland
Organic photovoltaics is one of the most promising technologies for low cost energy production with the advantages of semi-transparency, flexibility and solution processing. Significant improvement of the power conversion efficiency could be achieved in the last years using novel materials and adapted device engineering. To further improve the efficiency of solar cells the knowledge of the morphology is essential, as it decisively influences the device performance. The morphology of organic bulk heterojunction (BHJ) active layers depends not only on the involved materials but also on their molecular weight and their treatment like thermal annealing and solvent vapor annealing. Analytical Transmission Electron Microscopy (TEM) is a versatile tool to characterize the morphology of organic solar cells concerning on the one hand the interfaces of the various layers and on the other hand the material distribution in BHJ active layers. Combining high-resolution imaging with analytical techniques like electron energy-loss spectroscopy (EELS) and energy filtered TEM (EFTEM) as well as energy-dispersive X-ray spectroscopy (EDXS) the morphology can be determined and thus the device performance can be understood and further improved.