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Featured Event

5/22 - Student-Invited Lecture (chemical biology): Tobin Marks, Northwestern

Tobin J. Marks - speaker's webpage
Department of Chemistry and the Argonne-Northwestern Solar Research Center
Northwestern University
Host: GSO

"Plastic" Solar Cells with Interface Engineering

The ability to fabricate molecularly tailored interfaces with nanoscale precision can selectively modulate charge transport and molecular assembly at hard matter-soft matter interfaces, and facilitate transport of the “correct charges” while blocking transport of the “incorrect charges.” This interfacial tailoring can also control carrier-trapping defect densities at interfaces and stabilize them with respect to physical/thermal decohesion. In this lecture, challenges and opportunities are illustrated for three specific and related areas of research: 1) controlling charge transport across hard matter-soft matter interfaces in electroluminescent devices, 2) controlling charge transport across hard matter-soft matter interfaces in organic photovoltaic cells, 3) controlling charge transport by active layer organization at electrodes, 4) using this information to design new active layer molecules and polymers. It will be seen that rational interface engineering along with improved bulk-heterojunction polymer structures affords high solar power conversion efficiencies along with greater cell durability.

References

Savoie, B.M.; Movaghar, B.; Marks, T.J.; Ratner, M.A.  Simple Analytic Description of Collection Efficiency in Organic Photovoltaic Materials, J. Phys. Chem. Lett., 2013, 4, 704.

Zhou, N.; Guo, X.; Ortiz, R.P.; Li, S.; Zhang, S.; Chang, R.P.H.; Facchetti, A.; Marks, T.J. Bithiophene Imide and Benzodithiophene Copolymers for Efficient Inverted Polymer Solar Cells, Advanced Materials, 2012, 17, 2242-2248.

Servaites, J.D.; Ratner, M.A.; Marks, T.J. Bulk Heterojunction Organic Solar Cells:  A New Look at Traditional Models, Energy Environ. Sci., 20114, 4410-4422.

Lou, S.J.; Szarko, J.M.; Xu, T.; Yu, L.; Marks, T.J.; Chen. L.X. Additive Effects on Active Layer Solution Phase Aggregation in High-Efficiency Organic Solar Cells, J. Amer. Chem. Soc., 2011,133, 20661.

Murray, I.P; Lou, S.J.; Cote, L.J.; Loser, S.; Kadleck, C.J.; Xu, T.; Szarko, J.M.; Rolczynski, B.S.; Johns, J.E.; Huang, J.; Yu. L.; Chen, L.X.; Marks, T.J.; Hersam, M.C. Graphene Oxide Interlayers for Robust, High-Efficiency Organic Photovoltaics, J. Phys. Chem. Lett., 2011, 2, 3006.

Loser, S.; Bruns, C.J.; Miyauchi, H.; Ortiz, R.P.;  Facchetti, A.; Stupp, S.I.; Marks, T.J. A Naphtho-dithiophene-Based Small Molecule Donor for High Efficiency, Solution-Processed Bulk Hetero-junction Solar Cells, J. Amer. Chem. Soc., 2011, 133, 8142.

Servaites, J.D.; Ratner, M.A.; Marks, T.J. Bulk Heterojunction Organic Solar Cells:  A New Look at Traditional Models, Energy Environ. Sci., 20114, 4410. 

Szarko, J.M.; Guo, J.; Liang, Y.; Lee, B.; Rolczynski, B.S.; Strzalka, J.; Xu, T.; Loser, S.; Marks, T.J.; Yu, L; Chen, L.X. When Function Follows Form:  Effects of Side-Chains in Conjugated Copolymers on Film Morphology and BHJ Solar Cell Performance, Advan. Mater.2010, 22, 5468. 

Bagnis, D.; Beverina, L.; Huang, H.; Silvestri, F.; Zheng, Y.; Pagani, G.A.; Marks, T.J.; Facchetti, A. Alkenyl vs. Alkyl Substituent Effects in Squaraine-Based Bulk Heterojunction Solar Cells, J. Am. Chem. Soc., 2010, 132, 4074.

Hains, A.W.; Ramanan, C.; Irwin, M.D.; Liu, J.; Wasielewski, M.R.; Marks, T.J. Designed Bithiophene-Based Interfacial Layer for High-Efficiency Bulk-Heterojunction Organic Photovoltaic Cells.  Importance of Interfacial Energy Level Matching, ACS Appl. Mater. Interfaces, 2010, 2, 175.