Chad Risko

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  • Associate Professor
  • Chemistry
  • Materials
  • Physical
276 CAER Laboratory 2, 150 Chemistry-Physics Building
Research Interests:

B.S. Baker University, Baldwin City, KS, 1998
Ph.D. Georgia Institute of Technology, Atlanta, GA, 2005


Research in the Risko laboratory is inspired by the opportunities offered by complex synthetic materials and the desire to discover the fundamental connections among the chemical and physical phenomena that ultimately determine their performance. Too often, macro-scale experiments cannot provide the physicochemical knowledge required to truly understand why materials work, or fail, in particular applications as the intrinsic phenomena that determine performance are multiscale, beginning at the atomic level. Such limited insight, in turn, leads to materials design misconceptions that permeate the chemical literature.

With a focus on materials envisioned for semiconductors and power generation and storage, research in the Risko laboratory probes questions that connect molecular, polymer, and nanostructure composition and structure, materials creation, and molecular and material electronic, redox, optical, and mechanical characteristics. We develop our theoretical materials chemistry models and computational approaches by bridging quantum chemistry, equilibrium and non-equilibrium molecular dynamics (MD), condensed matter and device physics, data science, and materials and polymer science. This blend of expertise allows us to discover and exploit multidisciplinary connections to enable new understanding that can be transitioned across materials types. Further, we have grown an extensive, international group of collaborators whose expertise spans materials synthesis, processing, and characterization so that the understanding that we gain has decisive and immediate impact. Our perspective, ultimately, allows us to establish the knowledge required to facilitate the creation of in silico materials design paradigms that will spearhead transitions away from costly, time-consuming Edisonian approaches to materials development.

Honors & Awards

2020 University of Kentucky Center for Appalachian Research in Environmental Sciences (UK CARES) Faculty Fellow in Science Communication

2019 University of Kentucky College of Arts & Sciences Award for Outstanding Undergraduate Research Mentoring

2018 Office of Naval Research Young Investigator Award

2018 Cottrell Scholar (Research Corporation for Science Advancement, RCSA)

2018 Scialog Fellow for Advanced Energy Storage (Research Corporation for Science Advancement, RCSA)

2016 Emerging Investigator, Journal of Materials Chemistry (Royal Society of Chemistry)

Selected Publications: 
Acid Dyeing for Green Solvent Processing of Solvent Resistant Semiconducting Organic Thin Films. C.R. Harding, J. Cann, A. Laventure, M. Sadeghianlemraski, M. Abd-Ellah, K.R. Rao, B.S. Gelfand, H. Aziz, L. Kaake, C. Risko & G.C. Welch. Materials Horizons (2020) online. DOI: 10.1039/D0MH00785D
A Genetic Algorithmic Approach to Determine the Structure of Li-Al Layered Double Hydroxides. S. Li, B.S.S. Pokuri, S.M. Ryno, A. Nkansah, C. De'vine, B. Ganapathysubramanian & C. Risko. Journal of Chemical Information and Modeling (2020) online. DOI: 10.1021/acs.jcim.0c00493
Synthesis and Electronic Properties of a Linearly Fused Anthracene Dimer. E.O. Onyango, P.Z. Mannes, A. Pletnev, D.B. Granger, Q. Ai, C. Risko, J.E. Anthony & G.W. Gribble. Tetrahedron Letters (2020) 61, 152182. DOI: 10.1016/j.tetlet.2020.152182
Determination of the Free Energies of Mixing of Organic Solutions through a Combined Molecular Dynamics and Bayesian Statistics Approach. S. Li, B.S.S. Pokuri, S.M. Ryno, A. Nkansah, C. De'vine, B. Ganapathysubramanian & C. Risko. Journal of Chemical Information and Modeling (2020) 60, 1424-1431. DOI: 10.1021/acs.jcim.9b01113
Rational Functionalization of a C70 Buckybowl to Enable a C70:Buckybowl Co-crystal for Organic Semiconductor Applications. G. Gao, M. Chen, J. Roberts, M. Feng, C. Xiao, G. Zhang, S.R. Parkin, C. Risko & L. Zhang. Journal of the American Chemical Society (2020) 142, 2460-2470. DOI: 10.1021/jacs.9b12192
Nitration of Benzothioxanthene: Towards a New Class of Dyes with Versatile Photophysical Properties. J.M.A. Castán, L.A. Galán, S. Li, C. Dalinot, P.S. Marqués, M. Allain, C. Risko, C. Monnereau, O. Maury, P. Blanchard & C. Cabanetos. New Journal of Chemistry (2020) 44, 900-905. DOI: 10.1039/C9NJ05804D
Solvent-Molecule Interactions Govern Crystal Habit Selection in Naphthalene Tetracarboxylic Diimides. G.E. Purdum, X. Chen, N.G. Telesz, S.M. Ryno, N. Sengar, T. Gessner, C. Risko, P. Clancy, R.T. Weitz & Y.L. Loo. Chemistry of Materials (2019) 31, 9691-9698. DOI: 10.1021/acs.chemmater.9b03142
Understanding the Effect of Host Structure of Nitrogen Doped Ultrananocrystalline Diamond Electrode on Electrochemical Carbon Dioxide Reduction. N. Wanninayake, Q. Ai, R. Zhou, Md. A. Hoque, S. Herrell, M.I. Guzman, C. Risko & D.Y. Kim. Carbon (2019) 157, 408-419. DOI: 10.1016/j.carbon.2019.10.022
Computationally Aided Design of a High-Performance Organic Semiconductor: The Development of a Universal Crystal Engineering Core. A.J. Petty II, Q. Ai, J.C. Sorli, H.F. Haneef, G.E. Purdum, A. Boehm, D.B. Granger, K. Gu, C.P. Lacerda Rubinger, S.R. Parkin, K.R. Graham, O.D. Jurchescu, Y.L. Loo, C. Risko & J.E. Anthony. Chemical Science (2019) 10, 10543-10549. DOI: 10.1039/C9SC02930C
Exploiting Excited-State Aromaticity to Design Highly Stable Singlet Fission Materials. K.J. Fallon, P. Budden, E. Salvadori, A.M. Ganose, C.N. Savory, L. Eyre, S. Dowland, Q. Ai, S. Goodlett, C. Risko, D.O. Scanlon, C.W.M. Kay, A. Rao, R.H. Friend, A.J. Musser & H. Bronstein. Journal of the American Chemical Society (2019) 141, 13867-13876. DOI: 10.1021/jacs.9b06346
Even-Odd Alkyl Chain-Length Alternation Regulates Oligothiophene Crystal Structure. E. Burnett, Q. Ai, B. Cherniawski, S.R. Parkin, C. Risko & A. Briseño. Chemistry of Materials (2019) 31, 6900-6907. DOI: 10.1021/acs.chemmater.9b01317
Non-Covalent Close Contacts in Fluorinated Thiophene-Phenylene-Thiophene Conjugated Units: Understanding the Nature and Dominance of O···H versus S···F and O···F Interactions towards the Control of Polymer Conformation. T. Kharandiuk, E. Hussien, J. Cameron, R. Petrina, N. Findlay, R. Naumov, W. Klooster, S. Coles, Q. Ai, S. Goodlett, C. Risko & P. Skabara. Chemistry of Materials (2019) 31, 7070-7079. DOI: 10.1021/acs.chemmater.9b01886
Enhancing CO2 Absorption for Post-Combustion Carbon Capture via Zinc-based Biomimetic Catalysts in Industrially Relevant Amine Solutions. L.R. Widger, M. Sarma, R.A. Kelsey, C. Risko, C.A. Lippert, S.R. Parkin & K. Liu. International Journal of Greenhouse Gas Control (2019) 85, 156-165. DOI: 10.1016/j.ijggc.2019.04.002
Organic Semiconductors Derived from Dinaphtho-fused s-indacenes: How Molecular Structure and Film Morphology Influence Thin-Film Transistor Performance. A. Zeidell, L. Jennings, C. Frederickson, Q. Ai, J. Dressler, L. Zakharov, C. Risko, M.M. Haley & O.D. Jurchescu. Chemistry of Materials (2019) 31, 6962-6970. DOI: 10.1021/acs.chemmater.9b01436
Impact of Atomistic Substitution on Thin-Film Structure and Charge Transport in a Germanyl-ethynyl Functionalized Pentacene. J.C. Sorli, Q. Ai, D.B. Granger, K. Gu, S. Parkin, K. Jarolimek, N. Telesz, J.E. Anthony, C. Risko & Y.L. Loo. Chemistry of Materials (2019) 31, 6615-6623. DOI: 10.1021/acs.chemmater.9b00546

Triperyleno[3,3,3]propellane triimides: Achieving a New Generation of Quasi-D3h Symmetric Nanostructures in Organic Electronics. L. Lv, J. Roberts, C. Xiao, Z. Jia, W. Jiang, G. Zhang, C. Risko & L. Zhang. Chemical Science (2019) 10, 4951-4958. DOI: 10.1039/C9SC00849G

A NIR Absorbing Indolizine-Porphyrin Push-Pull Dye for Dye-Sensitized Solar Cells. H. Cheema, A. Baumann, E.K. Loya, P. Brogdon, L.E. McNamara, C. Carpenter, N.I. Hammer, S. Mathew, C. Risko & J.H. Delcamp. ACS Applied Materials & Interfaces (2019) 11, 16474-16489. DOI: 10.1021/acsami.8b21414

Oxidation Pathways Involving a Sulfide-Endcapped Donor–Acceptor–Donor π-Conjugated Molecule and Antimony(V) Chloride. S. Chaudhry, S.M. Ryno, M. Zeller, D.R. McMillin, C. Risko & J. Mei. Journal of Physical Chemistry B (2019) 123, 3866-3874. DOI: 10.1021/acs.jpcb.9b01389

Deconstructing the Behavior of Donor-Acceptor Copolymers in Solution & the Melt: The Case of PTB7. S.M. Ryno & C. Risko. Physical Chemistry Chemical Physics (2019) 21, 7802-7813. DOI: 10.1039/C9CP00777F

Bis(tercarbazole) Pyrene and Tetrahydropyrene Derivatives: Photophysical and Electrochemical Properties, Theoretical Modeling, and OLEDs. B.R. Kaafarani, T.H. El-Assaad, W.A. Smith, S.M. Ryno, F. Hermerschmidt, J. Lyons, D. Patra, B. Wex, E. List-Kratochvil, C. Risko, S. Barlow & S.R. Marder. Journal of Materials Chemistry C (2019) Advance Article. DOI: 10.1039/C8TC06266H

Orgnanometallic Hydride-Transfer Agents as Reductants for Organic Semiconductor Molecules. S. Zhang, K. Moudgil, E. Jucov, C. Risko, T.V. Timofeeva, S.R. Marder & S. Barlow. Inorganica Chimica Acta (2019) 489, 67-77. DOI: 10.1016/j.ica.2019.02.003

Magnetic Ordering in a Vanadium-Organic Coordination Polymer using a Pyrrolo[2,3-d:5,4-d′]bis(thiazole)-based Ligand. Y.A. Getmanenko, C.S. Mullins, V.N. Nesterov, S. Lake, C. Risko & E. Johnston-Halperin. RSC Advances (2018) 8, 36223-36232. DOI: 10.1039/C8RA05697H

Exploring Thermal Transitions in Anthradithiophene-based Organic Semiconductors to Reveal Structure-Packing Relationships. S. Li, S.M. Ryno & C. Risko. Journal of Materials Chemistry C (2018) 6, 10924-10934. DOI: 10.1039/C8TC03976C

Donor or Acceptor? How Selection of the Rylene Imide End Cap Impacts the Polarity of π-Conjugated Molecules for Organic Electronics. A.J. Payne, N.A. Rice, S.M. McAfee, S. Li, P. Josse, C. Cabanetos, C. Risko, B.H. Lessard & G.C. Welch. ACS Applied Energy Materials (2018) 1, 4906-4916. DOI: 10.1021/acsaem.8b00929

Presence of Short Intermolecular Contacts Screens for Kinetic Stability in Packing Polymorphs. G.E. Purdum, N.G. Telesz, K. Jarolimek, S.M. Ryno, T. Gessner, N.C. Davy, A.J. Petty, II, Y. Zhen, Y. Shu, A. Facchetti, G.E. Collis, W. Hu, C. Wu, J.E. Anthony, R.T. Weitz, C. Risko & Y.L. Loo. Journal of the American Chemical Society (2018) 140, 7519-7525. DOI: 10.1021/jacs.8b01421

Positional Effects from σ-Bonded Platinum(II) on Intersystem Crossing Rates in Perylenediimide Complexes: Synthesis, Structures, and Photophysical Properties. J. Yarnell, I. Davydenko, P. Dorovatovskii, V. Khrustalev, T.V. Timofeeva, F. Castellano, S.R. Marder, C. Risko & S. Barlow. Journal of Physical Chemistry C (2018) 122, 13848-13862. DOI: 10.1021/acs.jpcc.8b01003

Effect of Halogenation on the Energetics of Pure and Mixed Phases in Model Organic Semiconductors Comprised of Anthradithiophene Derivatives and C60. A. Abtahi, S.M. Mazza, S.M. Ryno, E.K. Loya, R. Li, S.R. Parkin, C. Risko, J.E. Anthony & K.R. Graham. Journal of Physical Chemistry C(2018) 122, 4757-4767. DOI: 10.1021/acs.jpcc.7b11729

Delimited Polyacenes: Edge Topology as a Tool to Modulate Carbon Nanoribbon Structure, Conjugation, and Mobility. Q. Ai, K. Jarolimek, S. Mazza, J.E. Anthony & C. Risko. Chemistry of Materials (2018) 30, 947-957. DOI: 10.1021/acs.chemmater.7b04715

Bromination of the Benzothioxanthene Bloc: Toward New π-Conjugated Systems for Organic Electronic Applications. P. Josse, S. Li, S.V. Dayneko, D. Joly, A. Labrunie, S. Dabos-Seignon, M. Allain, B. Siegler, R. Demadrille, G.C. Welch, C. Risko, P. Blanchard & C. Cabanetos. Journal of Materials Chemistry C (2018) 6, 761-766. DOI: 10.1039/C7TC05245F

Impact of Rotamer Diversity on the Self-Assembly of Nearly Isostructural Molecular Semiconductors. C. McDowell, K. Narayanaswamy, B. Yadagiri, T. Gayathri, M. Seifrid, R. Datt, S.M. Ryno, M.C. Heifner, V. Gupta, C. Risko, S. Singh & G. Bazan. Journal of Materials Chemistry A (2018) 6, 383-394. DOI: 10.1039/C7TA09972J

A Stable Two-Electron-Donating Phenothiazine for Application in Nonaqueous Redox Flow Batteries. J.A. Kowalski, M.D. Casselman, A.P. Kaur, J.D. Milshtein, C.F. Elliott, S. Modekrutti, N.H. Attanayake, N. Zhang, S.R. Parkin, C. Risko, F.R. Brushett & S.A. Odom. Journal of Materials Chemistry A (2017) 5, 24371-24379. DOI: 10.1039/c7ta05883g

Unusual Electronic Structure of the Donor-Acceptor Cocrystal Formed by Dithieno[3,2-a:2',3'-c]phenazine and 7,7,8,8-Tetracyanoquinodimethane. Q. Ai, Y.A. Getmanenko, K. Jarolimek, L.R. Castaneda-Perea, T.V. Timofeeva & C. Risko. Journal of Physical Chemistry Letters (2017) 8, 4510-4515. DOI: 10.1021/acs.jpclett.7b01816

An Unsymmetrical Non-Fullerene Acceptor: Synthesis via Direct Heteroarylation, Self-Assembly, and Utility as a Low Energy Absorber in Organic Photovoltaic Cells. A.J. Payne, S. Li, S.V. Dayneko, C. Risko & G.C. Welch. Chemical Communications (2017) 53, 10168-10171. DOI: 10.1039/c7cc05836e

Crossover from Band-Like to Thermally Activated Charge Transport in Organic Transistors due to Strain-Induced Traps. Y. Mei, P.J. Diemer, M.R. Niazi, R.K. Hallani, K. Jarolimek, C.S. Day, C. Risko, J.E. Anthony, A. Amassian & O.D. Jurchescu. Proceedings of the National Academy of Sciences of the United States of America (2017) 114, E6739-E6748. DOI: 10.1073/pnas.1705164114

Beyond the Hammett Effect: Using Strain to Alter the Landscape of Electrochemical Potentials. M.D. Casselman, C.F. Elliott, S. Modekrutti, P.L. Zhang, S.R. Parkin, C. Risko & S.A. Odom. ChemPhysChem (2017) 18, 2142-2146. DOI: 10.1002/cphc.201700607

Theory-Driven Insight into the Crystal Packing of Trialkylsilylethynyl Pentacenes. K.J. Thorley, T.W. Finn, K. Jarolimek, J.E. Anthony & C. Risko. Chemistry of Materials (2017) 29, 2502-2512. DOI: 10.1021/acs.chemmater.6b04211

High-Current-Density, Long-Duration Cycling of Soluble Organic Active Species for Non-Aqueous Redox Flow Batteries. J.D. Milshtein, A.P. Kaur, M.D. Casselman, J.A. Kowalski, S. Modekrutti, P. Zhang, N.H. Attanayake, C.F. Elliott, S.R. Parkin, C. Risko, F.R. Brushett & S.A. Odom. Energy & Environmental Science (2016) 9, 3531-3543. DOI: 10.1039/C6EE02027E

On Describing the Optoelectronic Characteristics of Poly(benzodithiophene-co-quinoxaline)–Fullerene Complexes: The Influence of Optimally Tuned Density Functionals. T. Kastinen, M. Niskanen, C. Risko, O. Cramariuc & T.I. Hukka. Physical Chemistry Chemical Physics (2016) 18, 27654-27670. DOI: 10.1039/C6CP04567G

10.    Indacenodibenzothiophenes: Synthesis, Optoelectronic Properties and Materials Applications of Molecules with Strong Antiaromatic Character. J.L. Marshall, K. Uchida, C. Frederickson, C. Schutt, A.M. Zeidell, K.P. Goetz, T.W. Finn, K. Jarolimek, L. Zakharov, C. Risko, R. Herges, O.D. Jurchescu & M.M. Haley. Chemical Science (2016) 7, 5547-5558. DOI: 10.1039/C6SC00950F

On the Impact of Isomer Structure and Packing Disorder in Thienoacene Organic Semiconductors. K.J. Thorley & C. Risko. Journal of Materials Chemistry C (2016) 4, 4040-4048. DOI: 10.1039/C5TC03900B

Overcharge Protection Above 4 V with Phenothiazine Redox Shuttles. A.P. Kaur, M.D. Casselman, C.F. Elliott, S.R. Parkin, C. Risko. & S.A. Odom. Journal of Materials Chemistry A (2016) 4, 5410-5414. DOI: 10.1039/C5TA10375D

Parallel and Perpendicular Packing in Mixed-Stack Cocrystals of Trimeric Perfluoro-ortho-phenylene Mercury and Benzo[1,2 b:6,5 b′]dithiophene-4,5-dione Derivatives. R. Castañeda, M.S. Fonari, C. Risko, Y.A. Getmanenko & T.V. Timofeeva. Crystal Growth & Design (2016) 16, 2190-2200. DOI: 10.1021/acs.cgd.6b00001

Intrinsic Properties of Two Benzodithiophene-Based Donor-Acceptor Copolymers Used in Organic Solar Cells: A Quantum-Chemical Approach. T. Kastinen, M. Niskanen, C. Risko, O. Cramariuc & T.I. Hukka. Journal of Physical Chemistry A (2016) 120, 1051-1064. DOI: 10.1021/acs.jpca.5b08465

Mixed-Valence Cations of Di(carbazol-9-yl) Biphenyl, Tetrahydropyrene, and Pyrene Derivatives. B. Kaafarani, C. Risko, T. El-Assaad, A. El-Ballouli, S.R. Marder & S. Barlow. Journal of Physical Chemistry C (2016) 120, 3156-3166. DOI: 10.1021/acs.jpcc.5b11061

Mapping the Configuration Dependence of Electronic Coupling in Organic Semiconductors. K.J. Thorley & C. Risko. Journal of Materials Chemistry C (2016) 4, 3825-3832. DOI: 10.1039/C5TC03765D

Dimers of Nineteen-Electron Sandwich Compounds: An Electrochemical Study of the Kinetics of their Formation. K. Moudgil, M. Mann, C. Risko, L.A. Bottomley, S.R. Marder, & S. Barlow Organometallics (2015) 34, 3706-3712. DOI: 10.1021/acs.organomet.5b00327

The Fate of Phenothiazine-based Redox Shuttles in Lithium Ion Batteries. M.D. Casselman, A.P. Kaur, K.A. Narayana, C.F. Elliott, C. Risko & S.A. Odom. Physical Chemistry Chemical Physics (2015) 17, 6905-6912. DOI: 10.1039/C5CP00199D

N-Substituted Phenothiazine Derivatives: How Stability of the Neutral and Radical Cation Forms Affect Overcharge Performance in Lithium-Ion Batteries. K.A. Narayana, M.D. Casselman, C.F. Elliott, S. Ergun, S.R. Parkin, C. Risko & S.A. Odom. ChemPhysChem (2015) 16, 1179-1189, DOI: 10.1002/cphc.201402674


PubMed Publications*: 
  • Elliott, CF ;Fraser, KE ;Odom, SA ;Risko, C "Steric Manipulation as a Mechanism for Tuning the Reduction and Oxidation Potentials of Phenothiazines." The journal of physical chemistry. A 125, 1 (2021): 272-278. Details. Full text
  • Ghasemi, M ;Balar, N ;Peng, Z ;Hu, H ;Qin, Y ;Kim, T.;Rech, JJ ;Bidwell, M ;Mask, W ;McCulloch, I ;You, W ;Amassian, A ;Risko, C ;O'Connor, BT ;Ade, H "A molecular interaction-diffusion framework for predicting organic solar cell stability." Nature materials (2021): Details. Full text
  • Liang, Z.;Choi, HH ;Luo, X ;Liu, T.;Abtahi, A ;Ramasamy, US ;Hitron, JA ;Baustert, KN ;Hempel, JL ;Boehm, AM ;Ansary, A ;Strachan, DR ;Mei, J ;Risko, C ;Podzorov, V ;Graham, KR "n-type charge transport in heavily p-doped polymers." Nature materials (2021): Details. Full text
  • Gao, G ;Chen, M.;Roberts, J ;Feng, M ;Xiao, C ;Zhang, G ;Parkin, S.;Risko, C ;Zhang, L. "Rational Functionalization of a C<sub>70</sub> Buckybowl To Enable a C<sub>70</sub>:Buckybowl Cocrystal for Organic Semiconductor Applications." Journal of the American Chemical Society 142, 5 (2020): 2460-2470. Details. Full text
  • Li, S.;Pokuri, BSS ;Ryno, SM ;Nkansah, A ;De'Vine, C ;Ganapathysubramanian, B ;Risko, C "Determination of the Free Energies of Mixing of Organic Solutions through a Combined Molecular Dynamics and Bayesian Statistics Approach." Journal of chemical information and modeling 60, 3 (2020): 1424-1431. Details. Full text
  • Lv, L ;Roberts, J ;Xiao, C ;Jia, Z ;Jiang, W ;Zhang, G ;Risko, C ;Zhang, L. "Triperyleno 3,3,3 propellane triimides: achieving a new generation of quasi-<i>D</i> <sub>3h</sub> symmetric nanostructures in organic electronics." Chemical science 10, 19 (2019): 4951-4958. Details. Full text
  • Cheema, H ;Baumann, A ;Loya, EK ;Brogdon, P ;McNamara, LE ;Carpenter, CA ;Hammer, NI ;Mathew, S ;Risko, C ;Delcamp, JH "Near-Infrared-Absorbing Indolizine-Porphyrin Push-Pull Dye for Dye-Sensitized Solar Cells." ACS applied materials & interfaces 11, 18 (2019): 16474-16489. Details. Full text
  • Chaudhry, S ;Ryno, SM ;Zeller, M.;McMillin, DR ;Risko, C ;Mei, J "Oxidation Pathways Involving a Sulfide-Endcapped Donor-Acceptor-Donor π-Conjugated Molecule and Antimony(V) Chloride." The journal of physical chemistry. B 123, 17 (2019): 3866-3874. Details. Full text
  • Ryno, SM ;Risko, C "Deconstructing the behavior of donor-acceptor copolymers in solution &amp; the melt: the case of PTB7." Physical chemistry chemical physics : PCCP 21, 15 (2019): 7802-7813. Details. Full text
  • Lopes, TO ;Machado, DFS ;Risko, C ;Brédas, JL ;de Oliveira, HCB "Bond Ellipticity Alternation: An Accurate Descriptor of the Nonlinear Optical Properties of π-Conjugated Chromophores." The journal of physical chemistry letters 9, 6 (2018): 1377-1383. Details. Full text
  • Casselman, MD ;Elliott, CF ;Modekrutti, S ;Zhang, PL ;, ;Risko, C ;Odom, SA "Beyond the Hammett Effect: Using Strain to Alter the Landscape of Electrochemical Potentials." Chemphyschem : a European journal of chemical physics and physical chemistry 18, 16 (2017): 2142-2146. Details. Full text
  • Ryno, SM ;Fu, YT ;Risko, C ;Brédas, JL "Polarization Energies at Organic-Organic Interfaces: Impact on the Charge Separation Barrier at Donor-Acceptor Interfaces in Organic Solar Cells." ACS applied materials & interfaces 8, 24 (2016): 15524-34. Details. Full text
  • Ryno, SM ;Risko, C ;Brédas, JL "Impact of Molecular Orientation and Packing Density on Electronic Polarization in the Bulk and at Surfaces of Organic Semiconductors." ACS applied materials & interfaces 8, 22 (2016): 14053-62. Details. Full text
  • Kastinen, T ;Niskanen, M ;Risko, C ;Cramariuc, O ;Hukka, TI "Intrinsic Properties of Two Benzodithiophene-Based Donor--Acceptor Copolymers Used in Organic Solar Cells: A Quantum-Chemical Approach." The journal of physical chemistry. A 120, 7 (2016): 1051-64. Details. Full text
  • Wu, Y.;Chew, AR ;Rojas, GA ;Sini, G ;Haugstad, G ;Belianinov, A ;Kalinin, SV ;Li, H.;Risko, C ;Brédas, JL ;Salleo, A ;Frisbie, CD "Strain effects on the work function of an organic semiconductor." Nature communications 7, (2016): 10270. Details. Full text
  • Kastinen, T ;Niskanen, M ;Risko, C ;Cramariuc, O ;Hukka, TI "On describing the optoelectronic characteristics of poly(benzodithiophene-co-quinoxaline)-fullerene complexes: the influence of optimally tuned density functionals." Physical chemistry chemical physics : PCCP 18, 39 (2016): 27654-27670. Details. Full text
  • Casselman, MD ;Kaur, AP ;Narayana, KA ;Elliott, CF ;Risko, C ;Odom, SA "The fate of phenothiazine-based redox shuttles in lithium-ion batteries." Physical chemistry chemical physics : PCCP 17, 10 (2015): 6905-12. Details. Full text
  • Narayana, KA ;Casselman, MD ;Elliott, CF ;Ergun, S ;, ;Risko, C ;Odom, SA "N-substituted phenothiazine derivatives: how the stability of the neutral and radical cation forms affects overcharge performance in lithium-ion batteries." Chemphyschem : a European journal of chemical physics and physical chemistry 16, 6 (2015): 1179-89. Details. Full text
  • Gieseking, RL ;Risko, C ;Brédas, JL "Distinguishing the Effects of Bond-Length Alternation versus Bond-Order Alternation on the Nonlinear Optical Properties of π-Conjugated Chromophores." The journal of physical chemistry letters 6, 12 (2015): 2158-62. Details. Full text
  • Gieseking, RL ;Ensley, TR ;Hu, H ;Hagan, DJ ;Risko, C ;Van Stryland, EW ;Brédas, JL "Nonlinear Optical Properties of X(C6H5)4 (X = B(-), C, N(+), P(+)): A New Class of Molecules with a Negative Third-Order Polarizability." Journal of the American Chemical Society 137, 30 (2015): 9635-42. Details. Full text
  • Zhang, S ;Naab, BD ;Jucov, EV ;Parkin, S.;Evans, EG ;Millhauser, GL ;Timofeeva, TV ;Risko, C ;Brédas, JL ;Bao, Z ;Barlow, S ;, "n-Dopants Based on Dimers of Benzimidazoline Radicals: Structures and Mechanism of Redox Reactions." Chemistry (Weinheim an der Bergstrasse, Germany) 21, 30 (2015): 10878-85. Details. Full text
  • Sutton, C ;Marshall, MS ;Sherrill, CD ;Risko, C ;Brédas, JL "Rubrene: The Interplay between Intramolecular and Intermolecular Interactions Determines the Planarization of Its Tetracene Core in the Solid State." Journal of the American Chemical Society 137, 27 (2015): 8775-82. Details. Full text
  • Marshall, JL ;Uchida, K.;Frederickson, CK ;Schütt, C ;Zeidell, AM ;Goetz, KP ;Finn, TW ;Jarolimek, K ;Zakharov, LN ;Risko, C ;Herges, R ;Jurchescu, OD ;Haley, MM "Indacenodibenzothiophenes: synthesis, optoelectronic properties and materials applications of molecules with strong antiaromatic character." Chemical science 7, 8 (0): 5547-5558. Details. Full text
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