Dr. Ryan Crisp

Ryan Crisp

Dr. Ryan Crisp

Photo: Crisp

Dr. Ryan W. Crisp did his Bachelors in Engineering Physics and Masters in Applied Physics at the Colorado School of Mines. He obtained his Ph. D. in Applied Physics in December 2015 from the Colorado School of Mines after carrying out his research at the National Renewable Energy Lab (NREL) on the synthesis, optoelectronic properties, and characterization of quantum dots and nanocrystals for use in solar cells where he worked with Joseph M. Luther. He next had a Postdoctoral research position at TU Delft working with Arjan Houtepen on synthesis, spectroscopy, and charge carrier transport in non-toxic nanocrystal solar cells. He now joins our group to work on solar cells and solar fuels.


Crisp, R. W.;* Hashemi, F. S. M.; Alkemade, J.; Kirkwood, N.; Grimaldi, G.; Kinge, S.; Siebbeles, L. D. A.; van Ommen, J. R.; Houtepen, A. J.*, “Atomic Layer Deposition of ZnO on InP Quantum Dot Films for Charge Separation, Stabilization, and Solar Cell Formation” Advanced Materials Interfaces 1901600 (2020).
Grimaldi, G.; van den Brom, M. J.; du Fosse, I.; Crisp, R. W.; Kirkwood, N.; Gudjonsdottir, S.; Geuchies, J. J.; Kinge, S.; Siebbeles, L. D. A.; Houtepen, A. J.,* “Engineering the Band Alignment in QD Heterojunction Films via Ligand Exchange” Journal of Physical Chemistry C, 123 (49), 29599-29608 (2019).
Marino, E.; Balazs, D.M.; Crisp, R.W.; Merino, D.H.; Loi, M.A.; Kodger, T.E.; Schall, P., “Controlling superstructure-property relationships via critical Casimir assembly of quantum dots,” Journal of Physical Chemistry C, 123 (22), 13451-13457 (2019).
Kirkwood, N.; Monchen, J. O. V.; Crisp, R. W.; Grimaldi, G.; Bergstein, H.Fossé, ; van der Stam, W.; Infante, I.; Houtepen, A. J., “Finding and fixing traps in II-VI and III-V colloidal quantum dots: The importance of Z-type ligand passivation,” Journal of the American Chemical Society,  140 (46), 15712-15723 (2018).
Crisp, R. W.;* Kirkwood, N.; Grimaldi, G.; Kinge, S.; Siebbeles, L. D. A.; Houtepen, A. J.*, “Highly-photoconductive InP quantum dots films and solar cells,” ACS Applied Energy Materials, DOI: 10.1021/acsaem.8b01453 (2018).
Ganesan, A. A.; Houtepen, A. J.; Crisp, R. W.,* “Quantum dot solar cells: small beginnings have large impacts,” Applied Science,8(10), 1867 (2018). Invited, special issue
Kroupa, M; Pach, G. F.; Vörös, M.; Giberti, F.; Chernomordik, B. D.; Crisp, R. W.; Nozik, A. J.; Johnson, J. C.; Klimov, V. L.; Galli, G.; Beard, M. C., “Enhanced Multiple Exciton Generation in PbS|CdS Janus-like Heterostructured Nanocrystals,” ACS Nano, 12, 10084-10094 (2018).
Crisp, R. W.; Grimaldi, G.; De Trizio, L.; Evers, W. H.; Kirkwood, N.; Kinge, S.; Manna, L.; Siebbeles, L. D. A.; Houtepen, A. J., “Selective antimony reduction initiating the nucleation and growth of InSb quantum dots.” Nanoscale, 10 (23), 11110-11116 (2018).
Grimaldi, G.; Crisp, R. W.; ten Brinck, S.; Zapata, F.; van Ouwendorp, M.; Renaud, N.; Kirkwood, N.; Evers, W.; Kinge, S.; Infante, I.; Siebbeles, L. D. A.; Houtepen, A. J., “Hot electron transfer in quantum-dot heterojunction films.” Nature Communications, 9 (1), 2310 (2018).
Spoor, F. C. M.; Grimaldi, G.; Delerue, C.; Evers, W. H.; Crisp, R. W.; Geiregat, P.; Hens, Z.; Houtepen, A. J.; Siebbeles, L. D. A., “Asymmetric Optical Transitions Determine the Onset of Carrier Multiplication in Lead Chalcogenide Quantum Confined and Bulk Crystals.” ACS Nano, 12 (5), 4796-4802 (2018).
Marino, E.; Kodger, T. E.; Crisp, R. W.; Timmerman, D.; MacArthur, K. E.; Heggen, M.; Schall, P., “Repairing Nanoparticle Surface Defects.” Angewandte Chemie, 129 (44), 13983-13987 (2017).
Yan, Y.; Crisp, R. W.; Gu, J.; Chernomordik, B. D.; Pach, G. F.; Marshall, Ashley R.; Turner, J. A.; Beard, M. C., “Multiple Exciton Generation for Photoelectrochemical Hydrogen Evolution Reactions with Quantum Yields Exceeding 100%.” Nature Energy, 2 (5), 17052 (2017).
Crisp, W.; Pach, G. F.; Kurley, J. M.; France, R. M.; Reese, M. O.; Nanayakkara, S. U.; MacLeod B. A.; Talapin, D. V. Beard, M. C.; Luther, J. M., “Tandem solar cells from solution-processed CdTe and PbS quantum dots using a ZnTe-ZnO tunnel junction.” Nano Letters, 17 (2), 1020-1027 (2017).
Kurley, J. M.; Panthani, M. G.; Crisp, R. W.; Nanayakkara, S. U.; Pach, G. F.; Reese, M. O.; Hudson, M. H.; Dolzhnikov, D. S.; Tanygin, V.; Luther, J. M.; Talapin, D. V., “Transparent Ohmic Contacts for Solution-Processed, Ultrathin CdTe Solar Cells.” ACS Energy Letters, 2 (1), 270–278 (2017).
Crisp, R. W.; Kroupa, D. M.; Marshall, A. R.; Miller, E. M.; Zhang, J.; Beard, M. C.; Luther, J. M., “Metal Halide Solid-State Surface Treatment for High Efficiency PbS and PbSe QD Solar Cells.” Scientific Reports, 5, 9945 (2015).
Zhang, J.; Crisp, R. W.; Gao, J.; Kroupa, D. M.; Beard, M. C.; Luther, J. M., “Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots.” The Journal of Physical Chemistry Letters, 6, 1830-1833 (2015).
Zhang, J.; Chernomordik, B. D.; Crisp, R. W.; Kroupa, D. M.; Luther, J. M.; Miller, E. M.; Gao, J.; Beard, M. C., “Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange.” ACS Nano, 9, 7151-63 (2015).
Crisp, R. W.; Callahan, R.; Reid, O. G.; Dolzhnikov, D. S.; Talapin, D. V.; Rumbles, G.; Luther, J. M.; Kopidakis, N., “Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te2– Ligands Lead to Charge Carrier Diffusion Lengths over 2 µm.” The Journal of Physical Chemistry Letters, 6, 4815-4821 (2015).
Yang, Y.; Yang, M.; Li, Z.; Crisp, R. W.; Zhu, K.; Beard, M. C., “Comparison of Recombination Dynamics in CH3NH3PbBr3 and CH3NH3PbI3 Perovskite Films: Influence of Exciton Binding Energy.” The Journal of Physical Chemistry Letters, 6, 4688-4692 (2015).
Panthani, M. G.; Kurley, J. M.; Crisp, R. W.; Dietz, T. C.; Ezzyat, T.; Luther, J. M.; Talapin, D. V., “High Efficiency Solution Processed Sintered CdTe Nanocrystal Solar Cells: The Role of Interfaces.” Nano Letters, 14 (2), 670-675 (2014).
Crisp, R. W.; Panthani, M. G.; Rance, W. L.; Duenow, J. N.; Parilla, P. A.; Callahan, R.; Dabney, M. S.; Berry, J. J.; Talapin, D. V.; Luther, J. M., “Nanocrystal Grain Growth and Device Architectures for High-Efficiency CdTe Ink-Based Photovoltaics.” ACS Nano, 8, 9063-9072 (2014).
Crisp, R. W.; Panthani, M. G.; Berry, J. J.; Rance, W. L.; Duenow, J. N.; Talapin, D. V.; Luther, J. M., “Nanoscale Engineering of Solution-processed CdTe Solar Cells using Nanocrystalline Precursors.” Photovoltaic Specialist Conference (PVSC), 40th IEEE, 3438-3441 (2014).
Bult, J. B.; Crisp, R. W.; Perkins, C. L.; Blackburn, J. L., “Role of Dopants in Long-Range Charge Carrier Transport for P-Type and N-Type Graphene Transparent Conducting Thin Films.” ACS Nano, 7, 7251-7261 (2013).
Crisp, R. W.; Schrauben, J. N.; Beard, M. C.; Luther, J. M.; Johnson, J. C., “Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays.” Nano Letters, 13, 4862-4869 (2013).
Weigand, C.; Crisp, R. W.; Ladam, C.; Furtak, T.; Collins, R.; Grepstad, J.; Weman, H., “Electrical, Optical and Structural Properties of Al-Doped ZnO Thin Films Grown on GaAs(111)B Substrates by Pulsed Laser Deposition.” Thin Solid Films, 545, 124-129 (2013).