Kevin Kohlstedt

About

Kevin Kohlstedt is a Research Professor in the Department of Chemistry at Northwestern University, based in Evanston, Illinois. His research focuses on charge transport in disordered materials, photovoltaic design using data analytics, plasmonic coupling of self-assembled superstructures, and the self-assembly of anisotropic colloids. As a research associate professor, he contributes to advancing understanding in these areas through experimental and analytical approaches, supporting the development of novel materials and technologies in the field of chemistry.

Research topics

• Organic chemistry
• Chemistry
• Materials science
• Photochemistry
• Crystallography
• Composite material
• Physical chemistry
• Nanotechnology
• Chemical engineering
• Medicinal chemistry

Selected publications

• Crystallography, Morphology, Electronic Structure, and Transport in Non-Fullerene/Non-Indacenodithienothiophene Polymer:Y6 Solar Cells

  Journal of the American Chemical Society · 2020 · 347 citations

  . Taken together, this work clarifies the richness of thermal annealing effects in high-efficiency NFA solar cells and tasks for future materials design.

  DOI

• Systematic Merging of Nonfullerene Acceptor π-Extension and Tetrafluorination Strategies Affords Polymer Solar Cells with >16% Efficiency

  Journal of the American Chemical Society · 2021 · 188 citations

  , respectively, are also lower than Y6 (150 meV). BHJ blends show preferential π-face-on orientation, and both fluorination and π-extension increase NFA crystallinity. Femto/nanosecond transient absorption spectroscopy (fs/nsTA) and integrated photocurrent device analysis (IPDA) indicate that π-extension modifies the phase separation to enhance film ordering and carrier mobility, while fluorination suppresses unimolecular recombination. This systematic study highlights the synergistic effects of…

  DOI

• Non-fullerene acceptors with direct and indirect hexa-fluorination afford >17% efficiency in polymer solar cells

  Energy & Environmental Science · 2021 · 109 citations

  The rational molecular design of non-fullerene acceptors (NFAs) in organic solar cells (OSCs) can profoundly influence the photovoltaic (OPV) performance.

  PublisherOA PDFDOI

• Control over Charge Separation by Imine Structural Isomerization in Covalent Organic Frameworks with Implications on CO₂ Photoreduction

  Journal of the American Chemical Society · 2024-02-08 · 96 citations

  articleOpen access

  Two-dimensional covalent organic frameworks (COFs) are an emerging class of photocatalytic materials for solar energy conversion. In this work, we report a pair of structurally isomeric COFs with reversed imine bond directions, which leads to drastic differences in their physical properties, photophysical behaviors, and photocatalytic CO2 reduction performance after incorporating a Re(bpy)(CO)3Cl molecular catalyst through bipyridyl units on the COF backbone (Re-COF). Using the combination of ul…

  PublisherOA PDFDOI

• Regiospecific <i>N</i>-alkyl substitution tunes the molecular packing of high-performance non-fullerene acceptors

  Materials Horizons · 2021-10-01 · 64 citations

  articleOpen access

  Single-crystals of a series of Bz-based NFAs derivatized via regiospecific N -alkyl engineering have been systematically studied. The J -aggregate-like packing in EHN6SEH-4F facilitates formation of ordered 3D channels for efficient charge transport.

  PublisherOA PDFDOI

Frequent coauthors

• George C. Schatz

  Northwestern University

  92 shared

• Tobin J. Marks

  Northwestern University

  62 shared

• Antonio Facchetti

  Georgia Institute of Technology

  62 shared

• Leighton O. Jones

  45 shared

• Michael R. Wasielewski

  Northwestern University

  43 shared

• Dean M. DeLongchamp

  Material Measurement Laboratory

  35 shared

• Mark C. Hersam

  Northwestern University

  35 shared

• S. Mukherjee

  33 shared

Labs

• Kohlstedt GroupPI

Similar researchers at Northwestern University

• Christos Malliakash-65
• Selim Alayogluh-55
• Ryan Youngh-46