Christopher Takacs

All Publications

• The nanoscale structure of the electrolyte-metal oxide interface (vol 11, pg 594, 2018) ENERGY & ENVIRONMENTAL SCIENCE Steinruck, H., Cao, C., Tsao, Y., Takacs, C. J., Konovalov, O., Vatamanu, J., Borodin, O., Toney, M. F. 2018; 11 (4): 996

  View details for DOI 10.1039/c8ee90018c

  View details for Web of Science ID 000430537000026

• The nanoscale structure of the electrolyte-metal oxide interface ENERGY & ENVIRONMENTAL SCIENCE Steinruck, H., Cao, C., Tsao, Y., Takacs, C. J., Konovalov, O., Vatamanu, J., Borodin, O., Toney, M. F. 2018; 11 (3): 594–602

  View details for DOI 10.1039/c7ee02724a

  View details for Web of Science ID 000428184700009

• High Conductivity in a Nonplanar n-Doped Ambipolar Semiconducting Polymer CHEMISTRY OF MATERIALS Perry, E. E., Chiu, C., Moudgil, K., Schlitz, R. A., Takacs, C. J., O'Hara, K. A., Labram, J. G., Glaudell, A. M., Sherman, J. B., Barlow, S., Hawker, C. J., Marder, S. R., Chabinyc, M. L. 2017; 29 (22): 9742–50

  View details for DOI 10.1021/acs.chemmater.7b03516

  View details for Web of Science ID 000416877400017

• Impact of interfacial molecular orientation on radiative recombination and charge generation efficiency NATURE COMMUNICATIONS Ran, N. A., Roland, S., Love, J. A., Savikhin, V., Takacs, C. J., Fu, Y., Li, H., Coropceanu, V., Liu, X., Bredas, J., Bazan, G. C., Toney, M. F., Neher, D., Thuc-Quyen Nguyen 2017; 8: 79

  Abstract

  A long standing question in organic electronics concerns the effects of molecular orientation at donor/acceptor heterojunctions. Given a well-controlled donor/acceptor bilayer system, we uncover the genuine effects of molecular orientation on charge generation and recombination. These effects are studied through the point of view of photovoltaics-however, the results have important implications on the operation of all optoelectronic devices with donor/acceptor interfaces, such as light emitting diodes and photodetectors. Our findings can be summarized by two points. First, devices with donor molecules face-on to the acceptor interface have a higher charge transfer state energy and less non-radiative recombination, resulting in larger open-circuit voltages and higher radiative efficiencies. Second, devices with donor molecules edge-on to the acceptor interface are more efficient at charge generation, attributed to smaller electronic coupling between the charge transfer states and the ground state, and lower activation energy for charge generation.Molecular orientation profoundly affects the performance of donor-acceptor heterojunctions, whilst it has remained challenging to investigate the detail. Using a controllable interface, Ran et al. show that the edge-on geometries improve charge generation at the cost of non-radiative recombination loss.

  View details for PubMedID 28724989

• Enhancing Fullerene-Based Solar Cell Lifetimes by Addition of a Fullerene Dumbbell ANGEWANDTE CHEMIE-INTERNATIONAL EDITION Schroeder, B. C., Li, Z., Brady, M. A., Faria, G. C., Ashraf, R. S., Takacs, C. J., Cowart, J. S., Duong, D. T., Chiu, K. H., Tan, C., Cabral, J. T., Salleo, A., Chabinyc, M. L., Durrant, J. R., McCulloch, I. 2014; 53 (47): 12870-12875

  Abstract

  Cost-effective, solution-processable organic photovoltaics (OPV) present an interesting alternative to inorganic silicon-based solar cells. However, one of the major remaining challenges of OPV devices is their lack of long-term operational stability, especially at elevated temperatures. The synthesis of a fullerene dumbbell and its use as an additive in the active layer of a PCDTBT:PCBM-based OPV device is reported. The addition of only 20 % of this novel fullerene not only leads to improved device efficiencies, but more importantly also to a dramatic increase in morphological stability under simulated operating conditions. Dynamic secondary ion mass spectrometry (DSIMS) and TEM are used, amongst other techniques, to elucidate the origins of the improved morphological stability.

  View details for DOI 10.1002/anie.201407310

  View details for Web of Science ID 000344793400035

  View details for PubMedCentralID PMC4241035

• Design, synthesis, and processing of narrow band gap organic semiconductors for solar cell fabrication[p] Bazan, G., Welch, G., Rogers, J., Sun, Y., Henson, Z., Leong, W., Takacs, C., Toney, M., Thuc-Quyen Nguyen, Heeger, A., Kramer, E. AMER CHEMICAL SOC. 2012

  View details for Web of Science ID 000324503203923