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20 results on '"Bruzek, Matthew J."'

7. Negative Isotope Effect on Field‐Effect Hole Transport in Fully Substituted 13 C‐Rubrene

Author

Ren, Xinglong, primary, Bruzek, Matthew J., additional, Hanifi, David A., additional, Schulzetenberg, Aaron, additional, Wu, Yanfei, additional, Kim, Chang‐Hyun, additional, Zhang, Zhuoran, additional, Johns, James E., additional, Salleo, Alberto, additional, Fratini, Simone, additional, Troisi, Alessandro, additional, Douglas, Christopher J., additional, and Frisbie, C. Daniel, additional

Published
2017
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8. Partial Fluorination as a Strategy for Crystal Engineering of Rubrene Derivatives

Author

Ogden, William A., primary, Ghosh, Soumen, additional, Bruzek, Matthew J., additional, McGarry, Kathryn A., additional, Balhorn, Luke, additional, Young, Victor, additional, Purvis, Lafe J., additional, Wegwerth, Sarah E., additional, Zhang, Zhuoran, additional, Serratore, Nicholas A., additional, Cramer, Christopher J., additional, Gagliardi, Laura, additional, and Douglas, Christopher J., additional

Published
2017
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9. Geminate and nongeminate recombination of triplet excitons formed by singlet fission

Author

Bayliss, Sam L, Chepelianskii, Alexei D, Sepe, Alessandro, Walker, Brian J, Ehrler, Bruno, Bruzek, Matthew J, Anthony, John E, Greenham, Neil C, Greenham, Neil [0000-0002-2155-2432], and Apollo - University of Cambridge Repository

Subjects
Stochastic Processes, Luminescence, Magnetic Resonance Spectroscopy, Energy Transfer, Solar Energy, Electrons, Membranes, Artificial, Organosilicon Compounds, Models, Theoretical, Microwaves
Abstract

We report the simultaneous observation of geminate and nongeminate triplet-triplet annihilation in a solution-processable small molecule TIPS-tetracene undergoing singlet exciton fission. Using optically detected magnetic resonance, we identify recombination of triplet pairs directly following singlet fission, as well as recombination of triplet excitons undergoing bimolecular triplet-triplet annihilation. We show that the two processes give rise to distinct magnetic resonance spectra, and estimate the interaction between geminate triplet excitons to be 60 neV.

Published
2014

11. Negative Isotope Effect on Field‐Effect Hole Transport in Fully Substituted 13C‐Rubrene.

Author

Ren, Xinglong, Bruzek, Matthew J., Hanifi, David A., Schulzetenberg, Aaron, Wu, Yanfei, Kim, Chang‐Hyun, Zhang, Zhuoran, Johns, James E., Salleo, Alberto, Fratini, Simone, Troisi, Alessandro, Douglas, Christopher J., and Frisbie, C. Daniel

Subjects
FIELD-effect transistors, ORGANIC semiconductors, ELECTRON mobility, CHARGE carrier mobility, CARBON isotopes
Abstract

Isotopic substitution is a useful method to study the influence of nuclear motion on the kinetics of charge transport in semiconductors. However, in organic semiconductors, no observable isotope effect on field‐effect mobility has been reported. To understand the charge transport mechanism in rubrene, the benchmark organic semiconductor, crystals of fully isotopically substituted rubrene, 13C‐rubrene (13C42H28), are synthesized and characterized. Vapor‐grown 13C‐rubrene single crystals have the same crystal structure and quality as native rubrene crystals (i.e., rubrene with a natural abundance of carbon isotopes). The characteristic transport signatures of rubrene, including room temperature hole mobility over 10 cm2 V−1 s−1, intrinsic band‐like transport, and clear Hall behavior in the accumulation layer of air‐gap transistors, are also observed for 13C‐rubrene crystals. The field‐effect mobility distributions based on 74 rubrene and 13C‐rubrene devices, respectively, reveal that 13C isotopic substitution produces a 13% reduction in the hole mobility of rubrene. The origin of the negative isotope effect is linked to the redshift of vibrational frequencies after 13C‐substitution, as demonstrated by computer simulations based on the transient localization (dynamic disorder) scenario. Overall, the data and analysis provide an important benchmark for ongoing efforts to understand transport in ordered organic semiconductors. [ABSTRACT FROM AUTHOR]

Published
2017
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14. Determination of energy level alignment at interfaces of hybrid and organic solar cells under ambient environment

Author

Davis, Robert J, Lloyd, Matthew T, Ferreira, Summer R, Bruzek, Matthew J, Watkins, Scott E, Lindell, Linda, Sehati, Parisa, Fahlman, Mats, Anthony, John E, Hsu, Julia W P, Davis, Robert J, Lloyd, Matthew T, Ferreira, Summer R, Bruzek, Matthew J, Watkins, Scott E, Lindell, Linda, Sehati, Parisa, Fahlman, Mats, Anthony, John E, and Hsu, Julia W P

Abstract

Device function in organic electronics is critically governed by the transport of charge across interfaces of dissimilar materials. Accurate measurements of energy level positions in organic electronic devices are therefore necessary for assessing the viability of new materials and optimizing device performance. In contrast to established methods that are used in solution or vacuum environments, here we combine Kelvin probe measurements performed in ambient environments to obtain work function values with photoelectron spectroscopy in air to obtain ionization potential, so that a complete energy level diagram for organic semiconductors can be determined. We apply this new approach to study commonly used electron donor and acceptor materials in organic photovoltaics (OPV), including poly(3-hexylthiophene) (P3HT), [6,6]-phenyl C61 butyric acid methyl ester (PCBM), and ZnO, as well as examine new materials. Band alignments across the entire OPV devices are constructed and compared with actual device performance. The ability to determine interfacial electronic properties in the devices enables us to answer the outstanding question: why previous attempts to make OPV devices using 6,13-bis(triisopropylsilylethynyl) (TIPS)-pentacene as the electron donor were not successful.

Published
2011
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20. Synthesis and Optical Properties of Dioxolane-FunctionalizedHexacenes and Heptacenes.

Author

Bruzek, Matthew J. and Anthony, John E.

Subjects
*DIOXOLANES, *CHEMICAL synthesis, *OPTICAL properties, *CRYSTALLINITY, *POLYCYCLIC aromatic hydrocarbons, *FLUORESCENCE
Abstract

Thesynthesis of dioxolane-functionalized hexacenes and heptacenesis reported. While heptacenes were too reactive to be successfullyisolated, hexacenes showed higher stability and characteristic long-wavelengthfluorescence both in solution and in the solid state as crystallinepowders. [ABSTRACT FROM AUTHOR]

Published
2014
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