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149 results on '"Grusenmeyer, Tod A."'

4. Optical Dispersion Data Analysis of Single‐Crystal CH3NH3PbBr3 for Optimized Perovskite Solar Cell Active Layer Absorptance.

Author

McCleese, Christopher L., Brennan, Michael C., Episcopo, Nathan, Sun, Lirong, Hong, Nina, Ramana, Chintalapalle V., Grusenmeyer, Tod A., and Stevenson, Peter R.

Subjects
SOLAR cell design, OPTICAL dispersion, PARTICLE size determination, SOLAR cells, REFRACTIVE index
Abstract

Proper derivation of CH3NH3PbX3 (MAPbX3; where X = Cl−, Br−, I−) optical constants is a critical step toward the development of high‐performance perovskite devices. To date, the optical dispersions at all wavelengths have been inconsistently characterized by under‐approximating or omitting anomalous spectral features. Herein, a rigorous optical dispersion data analysis of single‐crystal MAPbBr3 involving variable‐angle spectroscopic ellipsometry data appended with transmission intensity data is presented. This approach yields a more robust derivation of the refractive index and extinction coefficient for both anomalous (absorptance) and normal (no absorptance) optical dispersion regimes. Using the derived optical constants, illustrative modeled perovskite solar cell device designs are presented in relation to nonrealistic designs prepared using representative optical constants reported in the literature. In comparison, the derived optical constants enables the modeling of layer thicknesses to maximize absorption by the active layer (MAPbBr3) and minimize parasitic optical absorptance by the nonactive layers at broad angles of incidence (≈0°–70°). This robust derivation of MAPbBr3 optical constants is expected to impact the optical dispersion data analysis of all perovskite analogs and expedite targeted development of, for example, solar cell, light‐emitting diode, photo‐ and X‐ray/γ‐ray detector, and laser system technologies. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Optically Transparent Lead Halide Perovskite Polycrystalline Ceramics

Author

Brennan, Michael C., primary, McCleese, Christopher L., additional, Loftus, Lauren M., additional, Lipp, Jeremiah, additional, Febbraro, Michael, additional, Hall, Harris J., additional, Turner, David B., additional, Carter, Michael J., additional, Stevenson, Peter R., additional, and Grusenmeyer, Tod A., additional

Published
2024
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12. Thiophene-fused boron dipyrromethenes as energy efficient near-infrared photocatalysts for radical polymerizations.

Author

Stafford, Alex, Allen, Seth R., Grusenmeyer, Tod A., O'Dea, Connor J., Estergreen, Laura, Roberts, Sean T., and Page, Zachariah A.

Abstract

Rapid near-infrared (NIR) light driven polymerizations have the potential to enable energy-efficient, benign, and multimaterial manufacturing for applications ranging from tissue engineering to soft robotics. However, achieving photopolymerization rates with NIR light that are viable for emergent additive manufacturing technologies (∼0.1–1.0 M s−1 at light intensities <40 mW cm−2) has proven challenging due to its inherently low energy. Herein, we begin to take down these barriers through a systematic investigation of four distinct thiophene-fused boron dipyrromethene (BODIPY) photocatalysts. Through extended π-conjugation, the thiophene-fused BODIPYs effectively absorb NIR (>780 nm) light and drive efficient acrylate polymerizations upon exposure to low-intensity (2.5–40 mW cm−2) NIR light emitting diodes (LEDs). The installation of bromine atoms is shown to further improve NIR light-fueled photopolymerization efficiency by a factor of ∼1.5×. This enhancement was rationalized by the formation of long-lived spin-triplet excited states via intersystem crossing, as observed using ultrafast transient absorption spectroscopy. However, the triplet yields are modest (∼6–14%), suggesting efficient charge transfer from singlet excited states also occurs within the present photosystem. Finally, optimization of resin formulations containing non-halogenated thiophene-fused BODIPY photocatalysts is shown to provide unprecedented polymerization rates (0.33 M s−1) upon exposure to an 850 nm LED at an intensity of 20 mW cm−2. The structure–reactivity relationships identified herein provide key insights that will inform further design and optimization of energy-efficient, NIR light-driven polymerizations with utility in photocurables for coatings, adhesives, and 3D printing. [ABSTRACT FROM AUTHOR]

Published
2023
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15. Photolysis of Mixed Halide Perovskite Nanocrystals

Author

Brennan, Michael C., primary, Veghte, Daniel P., additional, Ford, Brittany R., additional, McCleese, Christopher L., additional, Loftus, Lauren M., additional, McComb, David W., additional, Song, Zhaoning, additional, Heben, Michael J., additional, and Grusenmeyer, Tod A., additional

Published
2023
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17. Heterotrimetallic Assemblies with 1,2,4,5-Tetrakis(diphenylphosphino)benzene Bridges: Constructs for Controlling the Separation and Spatial Orientation of Redox-Active Metallodithiolene Groups

Author

Kumar, Satyendra, primary, Selvachandran, Malathy, additional, Wu, Che, additional, Pascal, Robert A., additional, Zhang, Xiaodong, additional, Grusenmeyer, Tod, additional, Schmehl, Russell H., additional, Sproules, Stephen, additional, Mague, Joel T., additional, and Donahue, James P., additional

Published
2022
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21. Degradable Silk‐Based Subcutaneous Oxygen Sensors

Author

Falcucci, Thomas, primary, Presley, Kayla F., additional, Choi, Jaewon, additional, Fizpatrick, Vincent, additional, Barry, Jonah, additional, Kishore Sahoo, Jugal, additional, Ly, Jack T., additional, Grusenmeyer, Tod A., additional, Dalton, Matthew J., additional, and Kaplan, David L., additional

Published
2022
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25. Synthetically Tunable White-, Green-, and Yellow-Green-Light Emission in Dual-Luminescent Gold(I) Complexes Bearing a Diphenylamino-2,7-fluorenyl Moiety

Author

Mihaly, Joseph J., primary, Wolf, Steven M., additional, Phillips, Alexis T., additional, Mam, Sokhalita, additional, Yung, Zheng, additional, Haley, Joy E., additional, Zeller, Matthias, additional, de La Harpe, Kimberly, additional, Holt, Ethan, additional, Grusenmeyer, Tod A., additional, Collins, Stephanie, additional, and Gray, Thomas G., additional

Published
2022
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26. Interstitial Nature of Mn2+ Doping in 2D Perovskites

Author

Torma, Andrew J., primary, Li, Wenbin, additional, Zhang, Hao, additional, Tu, Qing, additional, Klepov, Vladislav V., additional, Brennan, Michael C., additional, McCleese, Christopher L., additional, Krzyaniak, Matthew D., additional, Wasielewski, Michael R., additional, Katan, Claudine, additional, Even, Jacky, additional, Holt, Martin V., additional, Grusenmeyer, Tod A., additional, Jiang, Jie, additional, Pachter, Ruth, additional, Kanatzidis, Mercouri G., additional, Blancon, Jean-Christophe, additional, and Mohite, Aditya D., additional

Published
2021
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33. Biodegradable oxygen biosensors via electrospinning

Author

Cybyk, Daniel B., primary, Reinsch, Bonnie M., additional, Presley, Kayla F., additional, Schweller, Ryan M., additional, Tedeschi, Andrea, additional, Burns, Teresa, additional, Chaparro, Francisco J., additional, Ly, Jack T., additional, Dalton, Matthew J., additional, Lozano, Monica, additional, Grusenmeyer, Tod A., additional, and Lannutti, John J., additional

Published
2020
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36. Synthesis and Photophysical Properties of Laterally Asymmetric Digold(I) Alkynyls and Triazolyl: Ancillary Ligand and Organic Functionality Dictate Excited-State Dynamics

Author

Mihaly, Joseph J., primary, Phillips, Alexis T., additional, Malloy, Jacob T., additional, Marsh, Zachary M., additional, Zeller, Matthias, additional, Haley, Joy E., additional, de La Harpe, Kimberly, additional, Grusenmeyer, Tod A., additional, and Gray, Thomas G., additional

Published
2020
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37. Synthesis and photophysics of gold(i) alkynyls bearing a benzothiazole-2,7-fluorenyl moiety: a comparative study analyzing influence of ancillary ligand, bridging moiety, and number of metal centers on photophysical properties

Author

Mihaly, Joseph J., primary, Phillips, Alexis T., additional, Stewart, David J., additional, Marsh, Zachary M., additional, McCleese, Christopher L., additional, Haley, Joy E., additional, Zeller, Matthias, additional, Grusenmeyer, Tod A., additional, and Gray, Thomas G., additional

Published
2020
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38. Interstitial Nature of Mn2+Doping in 2D Perovskites.

Author

Torma, Andrew J., Wenbin Li, Hao Zhang, Qing Tu, Klepov, Vladislav V., Brennan, Michael C., McCleese, Christopher L., Krzyaniak, Matthew D., Wasielewski, Michael R., Katan, Claudine, Even, Jacky, Holt, Martin V., Grusenmeyer, Tod A., Jie Jiang, Pachter, Ruth, Kanatzidis, Mercouri G., Blancon, Jean-Christophe, and Mohite, Aditya D.

Published
2021
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45. Solvent effects on isomerization in a ruthenium sulfoxide complex

Author

Grusenmeyer, Tod A., McClure, Beth Anne, Ziegler, Christopher J., and Rack, Jeffrey J.

Subjects
Isomerization -- Analysis, Organometallic compounds -- Structure, Organometallic compounds -- Chemical properties, Organometallic compounds -- Electric properties, Pyridine -- Chemical properties, Pyridine -- Electric properties, Quinoline -- Chemical properties, Quinoline -- Electric properties, Ruthenium -- Chemical properties, Ruthenium -- Electric properties, Chemistry
Published
2010

47. Electronic Structures and Spectra of Donor–Acceptor Conjugated Oligomers

Author

Nguyen, Kiet A., Pachter, Ruth, Loftus, Lauren M., Hong, Gongyi, Day, Paul N., Azoulay, Jason D., and Grusenmeyer, Tod A.

Abstract

Narrow band gap donor–acceptor conjugated polymers present excellent paradigms in photonics and optoelectronics due to their chemical tunability, correlated electronic structures, and tunable open-shell electronic configurations. However, rational design for enhancing the properties of these molecular systems remains challenging. In this study, we employed density functional theory (DFT) calculations to investigate prototypical narrow band gap donor–acceptor conjugated oligomers, consisting of alternating cyclopentadithiophene (CPDT) donors paired with benzothiadiazole (BT), benzoselenadiazole (BSe), benzobisthiadiazole (BBT), and thiadiazoloquinoxaline (TQ) acceptors. Analyses of structures, singlet–triplet gaps, and absorption spectra of oligomers with up to ten repeat units have shown that when incorporating the BT, BSe, and TQ acceptors, the backbone curvature resulted in spiral structures that were energetically favored over their linear counterparts, causing differences in the calculated circular dichroism spectra. Oligomers with BBT-based acceptors preferred, however, a linear geometry, consistent with an open-shell electronic structure. Calculated singlet–triplet splittings demonstrated the importance of long chains and specific structures for consistency with the experiment, while effects of the solvent were also quantified. Based on the predicted low-energy conformations, one-photon absorption spectra for the considered oligomers have shown that using the Tamm–Dancoff approximation within time-dependent DFT for the large systems offers good agreement with the first absorption maxima in measured experimental spectra, thus validating the method for large donor–acceptor oligomers. Natural transition orbital analyses provided insights into the excited-state characteristics. Two-photon absorption maxima were accurately predicted, but the cross-sections were overestimated or underestimated, as dependent on the level of theory employed, to be addressed in future work.

Published
2024
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48. Correction to “Evaluating the Extent of Intramolecular Charge Transfer in the Excited States of Rhenium(I) Donor–Acceptor Complexes with Time-Resolved Vibrational Spectroscopy”

Author

Yue, Yuankai, primary, Grusenmeyer, Tod, additional, Ma, Zheng, additional, Zhang, Peng, additional, Pham, Tri Tat, additional, Mague, Joel T., additional, Donahue, James P., additional, Schmehl, Russell H., additional, Beratan, David N., additional, and Rubtsov, Igor V., additional

Published
2016
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