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M. Erkan Köse

Materials Chemistry and Photochemistry

Our research interests are mainly in the field of organic solar cells for next generation photovoltaic devices. In recent years, tremendous amount of research has focused on organic solar cells for converting sunlight directly into electricity. Organic solar cells are attractive because of their flexibility, ease of processing, and potential low cost manufacture. However, the main disadvantages in organic photovoltaics are low device efficiencies and low stabilities compared to the properties of their inorganic counterparts.

Most of the currently used organic materials utilized in photovoltaice devices only partially absorb the sunlight. Our goal is to design and synthesize novel conjugated materials with better sunlight absorption profiles for use in organic solar cells. A deeper understanding of energy transfer and carrier transport will help to alleviate the limiting mechanisms in device operations. Our second theme, in conjunction with the first one, involves theoretical calculations and simulations to reveal the structure-property relationships that are important for light absorption, energy and charge transport dynamics in conjugated materials. While designing novel low band-gap materials, it is critical to align the energy levels and band structure of the donor and acceptor in a way that the created excitons separate into charges at donor-acceptor interface. Theoretical calculations on candidate structures are therefore invaluable for selecting promising materials for target synthesis. Theory guided synthesis will speed up the efforts and also will provide insight into the fundamental properties of the molecules or polymers under consideration.

The students in our group will have the opportunity to gain expertise in device fabrication, organic synthesis, spectroscopic experiments, theoretical calculations and simulations.

Selected Publications

Muhammet Erkan Kose, Peter Graf, Nikos Kopidakis, Sean E. Shaheen, Kwiseon Kim, Garry Rumbles, “Exciton migration in conjugated dendrimers: A joint experimental and theoretical study”
ChemPhysChem, accepted (2009)

William J. Mitchell, Andrew J. Ferguson, Muhammet E. Kose, Benjamin L. Rupert, David S. Ginley, Garry Rumbles, Sean E. Shaheen, Nikos Kopidakis, “Structure-dependent photophysics of first-generation phenyl-cored thiophene dendrimers” Chemistry of Materials 21 (2): 287 (2009)

Brian A. Gregg, Muhammet Erkan Kose, “Reversible switching between molecular and charge transfer phases in a liquid crystalline organic semiconductor”
Chemistry of Materials 20 (16): 5235 (2008)

Muhammet E. Kose, William J. Mitchell, Nikos Kopidakis, Christopher H. Chang, Sean E. Shaheen, Kwiseon Kim, Garry Rumbles, “Theoretical studies on conjugated phenyl-cored thiophene dendrimers for photovoltaic applications”
Journal of the American Chemical Society 129 (46): 14257 (2007)

Thomas Cardolaccia, Alison M. Funston, Muhammet Erkan Kose, Julia M. Keller, John R. Miller, Kirk S. Schanze, “Radical ion states of platinum acetylide oligomers”
Journal of Physical Chemistry B 111 (5): 929 (2007)

Muhammet Erkan Kose, Barbara A. Harruff, Yi Lin, L. Monica Veca, Fushen Lu, Ya-Ping Sun, “Efficient quenching of photoluminescence from functionalized single-walled carbon nanotubes by nitroaromatic molecules”
Journal of Physical Chemistry B 110 (29): 14032 (2006)

Ya-Ping Sun, Bing Zhou, Yi Lin, Wei Wang, K. A. Shiral Fernando, Pankaj Pathak, Mohammed Jaouad Meziani, Barbara A. Harruff, Xin Wang, Haifang Wang, Pengju G. Luo, Hua Yang, Muhammet Erkan Kose, Bailin Chen, L. Monica Veca, and Su-Yuan Xie, “Quantum-sized carbon dots for bright and colorful photoluminescence”
Journal of the American Chemical Society 128 (24): 7756 (2006)

Muhammet Erkan Köse, Ahmed Omar, Christopher A. Virgin, Bruce F. Carroll, and Kirk S. Schanze, “Principal component analysis calibration method for dual-luminophore oxygen and temperature sensor films: Application to luminescence imaging”
Langmuir 21 (20): 9110 (2005)

Muhammet Erkan Köse, Bruce F. Carroll, and Kirk S. Schanze, “Preparation and spectroscopic properties of multiluminophore luminescent oxygen and temperature sensor films”
Langmuir 21 (20): 9121 (2005)

Chunyan Tan, Mauricio R. Pinto, M. Erkan Kose, Ion Ghiviriga, Kirk S. Schanze,
“Solvent-induced self-assembly of a meta-linked conjugated polyelectrolyte. Helix formation, guest intercalation, and amplified quenching”
Advanced Materials 16 (14): 1208 (2004)

Ulrike Salzner, M. Erkan Kose, “Does the donor-acceptor concept work for designing synthetic metals? 2. Theoretical investigation of copolymers of 4-(dicyanomethylene)-4H-cyclopenta[2,1-b : 3,4-b ']dithiophene and 3,4-(ethylenedioxy)thiophene”
Journal of Physical Chemistry B 106 (36): 9221 (2002)

Assistant Professor

BS, Bilkent University, Turkey, 1999
MS, Bilkent University, Turkey, 2001
PhD, University of Florida, 2005
Postdoctoral Fellow, National Renewable Energy Laboratory, CO, 2006-2009
Postdoctoral Fellow, Clemson University, SC, 2005-2006

Office: Ladd 104B

tel 701-231-8291
fax 701-231-8831

Muhammet.Kose@
ndsu.edu

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