Advanced Functional Materials and Devices (AFMD) Group

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Doped-carbazolocarbazoles as hole transporting materials in small molecule solar cells with different architectures

Organic Electronics: physics, materials, applications 17 (2014) 28-32

Authors:

D Curiel, MM Montoya, M Hummert, M Riede, K Leo

Abstract:

© 2014 Elsevier Ltd. All rights reserved.The adaptation of interfacial layers to the stacked architecture of organic solar cells represents a very useful strategy for improved device operation. In this context, heteroacenic structures such as carbazolocarbazoles have been doped and evaluated as hole transporting materials in small molecule solar cell with either inverted or conventional architecture. S-kinks in the IV-curve detected for the inverted solar cells could be remarkably corrected by reversing the deposition sequence, highlighting the importance of buffer layer adjustment. Some of the studied carbazolocarbazoles proved to be a suitable molecule to be used as hole transporting materials.
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Determining doping efficiency and mobility from conductivity and Seebeck data of n-doped C60 layers

(2014)

Authors:

Torben Menke, Debdutta Ray, Hans Kleemann, Karl Leo, Moritz Riede
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Exploiting diffusion currents at Ohmic contacts for trap characterization in organic semiconductors

Organic Electronics Elsevier 15:10 (2014) 2428-2432

Authors:

Janine Fischer, Wolfgang Tress, Hans Kleemann, Johannes Widmer, Karl Leo, Moritz Riede
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Direct Electrical Evidence of Plasmonic Near-Field Enhancement in Small Molecule Organic Solar Cells

The Journal of Physical Chemistry C American Chemical Society (ACS) 118:28 (2014) 15128-15135

Authors:

Till Jägeler-Hoheisel, Franz Selzer, Moritz Riede, Karl Leo
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Increased open-circuit voltage of organic solar cells by reduced donor-acceptor interface area

Advanced Materials 26:23 (2014) 3839-3843

Authors:

K Vandewal, J Widmer, T Heumueller, CJ Brabec, MD McGehee, K Leo, M Riede, A Salleo

Abstract:

The charge carrier lifetime in small molecule: C60 photovoltaic devices is increased by reducing the physical interface area availabe for recombination. For donor contents below 10%, the gain in open-circuit voltage (Voc) depends logarithmically on the interface area while the energy of the interfacial charge-transfer state ECT remains invariant. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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