Dr. Ryan 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.

Ryan is now starting his independent career at CTFM on the assembly of functional quantum dot layers with exceptional photophysical properties, with support from FAU’s ‘Emerging Talents Initiative’, the Engineering of Advanced Materials (EAM) center, and a research grant from the DFG. Read more here.

Link to the Crisp-group homepage.

Publications

Hager S., Herbig B., Müller V., Dreßel AK., Dehm K., Mandel K., Wintzheimer S., Crisp R.:
Electrospun carbon-TiO₂ composite nanofibers for environmental photoelectrocatalysis
In: Journal of Photochemistry and Photobiology 32 (2026), Article No.: 100278
ISSN: 2666-4690
DOI: 10.1016/j.jpap.2026.100278
Mauritz V., Ruhland N., Englhard J., Steiger F., Perez-Ojeda Rodriguez ME., Bachmann J., Crisp R.:
Decomposition Pathways of Thioureas in Oleylamine Control Reactive Sulfur Species in SrS Nanocrystal Synthesis
In: Chemistry of Materials 38 (2026), p. 2680-2689
ISSN: 1520-5002
DOI: 10.1021/acs.chemmater.5c02818

Beller NS., Beller M., Murmann JJ., Crisp R.:
Impact of the medical briefing and vaccine type on adverse events following COVID-19 vaccination: A randomized clinical trial
In: Vaccine 61 (2025), Article No.: 127392
ISSN: 0264-410X
DOI: 10.1016/j.vaccine.2025.127392
Duran Toro V., Crisp R., Kocar E., Wasner F., Signorelli L., Shojaei Baghini M., di Gianvincenzo P., Heidari H., Bachmann J., Moya SE., Gregurec D.:
Barium Titanate-Coated Cobalt Ferrite Core–Shell Magnetoelectric Nanoparticles for Wireless Actuation Technologies
In: ACS Applied Nano Materials 8 (2025), p. 20676-20684
ISSN: 2574-0970
DOI: 10.1021/acsanm.5c03654
Grochala D., Karcz S., Paleczek A., Blajszczak L., Kocon M., Marszalek K., Kern S., Crisp R., Staszek K., Rydosz A.:
NO2 detection via microwave-based gas sensor with SnO2 deposited by ALD
16th German Microwave Conference, GeMiC 2025 (Dresden, DEU, 17. March 2025 - 19. March 2025)
In: 2025 16th German Microwave Conference, GeMiC 2025 2025
DOI: 10.23919/GeMiC64734.2025.10979063
Guldi DM., Langford D., Reva Y., Bo Y., Gubanov K., Wu M., Günay-Gürer A., Mai LA., Crisp R., Engelmann I., Spiecker E., Fink R., Kahnt A., Jana B., Guldi DM.:
Improving Photocatalytic Hydrogen Generation via Polycitric Acid-based Carbon Nanodots
In: Angewandte Chemie International Edition (2025)
ISSN: 1433-7851
DOI: 10.1002/anie.202418626
Hamburger RC., Korenko S., Kern S., Büttner P., Dehm K., Reeves MW., Crisp R., Bachmann J., Young ER.:
Ultrafast Dynamics of Complete Sb2S3 Solar Cells Unveiled via a Bifacial Architecture
In: Advanced Materials Interfaces (2025)
ISSN: 2196-7350
DOI: 10.1002/admi.202500387
Koch V., Zeng X., Deckert A., Büttner P., Franz E., Ding F., Anderson MA., Zhang J., Kupfer C., Mack E., Ambasta VK., Duchstein P., Dehm K., Furxhiu S., Zahl A., Frisch J., Hoga F., Stubhan T., Wilks RG., Peng Z., Brummel O., Crisp R., Zahn D., Müller C., Guldi DM., Bär M., Wisser D., Libuda J., Brabec C., Bachmann J.:
Solution ALD of (CH3NH3)(PbI3) Perovskite Thin Films Yields Functional Quality and Stability Superior to Classical Processing
In: Angewandte Chemie International Edition (2025), Article No.: e13903
ISSN: 1433-7851
DOI: 10.1002/anie.202513903
Linke LK., Dehm K., Gubanov K., Fink R., Szyja BM., Crisp R.:
Colloidal organometallic synthesis of solution-processable barium titanate nanoparticles for nanoelectronic applications
In: Nanoscale (2025)
ISSN: 2040-3364
DOI: 10.1039/d4nr05133e
Lipińska W., Coy E., Grochowska K., Gumieniak J., Kramek A., Crisp R., Wolff S., Siuzdak K.:
Transparent Electrodes Composed of Organized Titania Nanotubes and Transition Metal Sulfides for the Oxygen Evolution Reaction
In: Advanced Materials Interfaces (2025)
ISSN: 2196-7350
DOI: 10.1002/admi.202500606
Mauritz V., Ziegler A., Klerner L., Englhard J., Dehm K., Uhlein T., Gubanov K., Knüpfer C., Harder S., Fink R., Meyer B., Crisp R.:
Precursor Selection Strategies for Two-Dimensional Anisotropic Growth and Morphological Control of BaTiS3Nanocrystals
In: Chemistry of Materials 37 (2025), p. 6552-6561
ISSN: 1520-5002
DOI: 10.1021/acs.chemmater.5c00956

Crisp R., Singh S.:
Insights into the Illuminating World of Nanocrystalline Materials: Structure–Property Relationships in Precise Nanocrystals to Ensembles
In: Crystal Growth and Design (2024)
ISSN: 1528-7483
DOI: 10.1021/acs.cgd.4c01098
Dehm K., Zanetti A., Fett B., Mauritz V., Hamburger RC., Langford D., Guldi DM., Young ER., Mandel K., Crisp R.:
Alteration of the Optoelectronic Properties of CuInS2 Quantum Dots via Colloidal Annealing
In: Crystal Growth and Design (2024)
ISSN: 1528-7483
DOI: 10.1021/acs.cgd.4c00150
Kern S., Yi G., Büttner P., Scheler F., Tran MH., Korenko S., Dehm K., Kundrata I., Zahl A., Albrecht S., Bachmann J., Crisp R.:
Monolithic Two-Terminal Tandem Solar Cells Using Sb2S3 and Solution-Processed PbS Quantum Dots Achieving an Open-Circuit Potential beyond 1.1 V
In: ACS Applied Materials and Interfaces 16 (2024), p. 13903-13913
ISSN: 1944-8244
DOI: 10.1021/acsami.3c16154
Lipińska W., Grochowska K., Ryl J., Karczewski J., Sawczak M., Coy E., Mauritz V., Crisp R., Siuzdak K.:
Coupling between the photoactivity and CO2 adsorption on rapidly thermal hydrogenated vs. conventionally annealed copper oxides deposited on TiO2 nanotubes
In: Journal of Materials Science 59 (2024), p. 16947-16962
ISSN: 0022-2461
DOI: 10.1007/s10853-024-10223-4
Lipińska W., Wolff S., Dehm K., Hager S., Gumieniak J., Kramek A., Crisp R., Coy E., Grochowska K., Siuzdak K.:
Transparent TiO2 nanotubes supporting silver sulfide for photoelectrochemical water splitting
In: Nanoscale (2024)
ISSN: 2040-3364
DOI: 10.1039/d4nr01440e
Mauritz V., Crisp R.:
Unravelling the intricacies of solvents and sulfur sources in colloidal synthesis of metal sulfide semiconductor nanocrystals
In: Journal of Materials Chemistry C 12 (2024), p. 11319-11334
ISSN: 2050-7526
DOI: 10.1039/D4TC01414F

Ding F., Tavera Méndez CL., Grass JP., Crisp R., Barr M., Wisser D.:
Solid-State NMR Spectroscopic Investigation of TiO2 Grown on Silica Nanoparticles by Solution Atomic Layer Deposition
In: Advanced Materials Interfaces (2023)
ISSN: 2196-7350
DOI: 10.1002/admi.202202131
Eigen A., Schmidt V., Sarcletti M., Freygang S., Hartmann-Bausewein A., Schneider V., Zehetmeier A., Mauritz V., Müller L., Gaß H., Rockmann L., Crisp R., Halik M.:
Remediation of charged organic pollutants—binding motifs for highly efficient water cleaning with nanoparticles
In: Nano Select (2023)
ISSN: 2688-4011
DOI: 10.1002/nano.202300130
Mauritz V., Dehm K., Hager S., Crisp R.:
Colloidal nanocrystal synthesis of alkaline earth metal sulfides for solution-processed solar cell contact layers
In: Zeitschrift fur Kristallographie - Crystalline Materials (2023)
ISSN: 2196-7105
DOI: 10.1515/zkri-2023-0006
Reva Y., Jana B., Langford D., Kinzelmann M., Bo Y., Schol P., Scharl T., Zhao X., Crisp R., Drewello T., Clark T., Cadranel A., Guldi DM.:
Understanding the Visible Absorption of Electron Accepting and Donating CNDs
In: Small (2023)
ISSN: 1613-6829
DOI: 10.1002/smll.202207238

Dehm K., Walter T., Weichselgartner M., Crisp R., Wommer K., Aust M., Vogel N.:
Sustainable Repellent Coatings Based on Renewable Drying and Nondrying Oils
In: Advanced Materials Interfaces (2022)
ISSN: 2196-7350
DOI: 10.1002/admi.202202032

Manteiga Vázquez F., Yu Q., Klepzig LF., Siebbeles LD., Crisp R., Lauth J.:
Probing Excitons in Ultrathin PbS Nanoplatelets with Enhanced Near-Infrared Emission
In: Journal of Physical Chemistry Letters (2021)
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.0c03461

Crisp R., Hashemi FSM., Alkemade J., Kirkwood N., Grimaldi G., Kinge S., Siebbeles LDA., Van Ommen JR., Houtepen AJ.:
Atomic Layer Deposition of ZnO on InP Quantum Dot Films for Charge Separation, Stabilization, and Solar Cell Formation
In: Advanced Materials Interfaces (2020), Article No.: 1901600
ISSN: 2196-7350
DOI: 10.1002/admi.201901600

Grimaldi G., Van Den Brom MJ., Du Fosse I., Crisp R., Kirkwood N., Gudjonsdottir S., Geuchies JJ., Kinge S., Siebbeles LDA., Houtepen AJ.:
Engineering the Band Alignment in QD Heterojunction Films via Ligand Exchange
In: Journal of Physical Chemistry C 123 (2019), p. 29599-29608
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.9b09470
Marino E., Balazs DM., Crisp R., Hermida-Merino D., Loi MA., Kodger TE., Schall P.:
Controlling Superstructure-Property Relationships via Critical Casimir Assembly of Quantum Dots
In: Journal of Physical Chemistry C 123 (2019), p. 13451-13457
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.9b02033

Crisp R.:
Enhanced Multiple Exciton Generation in PbS|CdS Janus-like Heterostructured Nanocrystals
In: ACS nano (2018)
ISSN: 1936-0851
DOI: 10.1021/acsnano.8b04850
Crisp R., Grimaldi G., De Trizio L., Evers WH., Kirkwood N., Kinge S., Manna L., Siebbeles LDA., Houtepen AJ.:
Selective antimony reduction initiating the nucleation and growth of InSb quantum dots
In: Nanoscale 10 (2018), p. 11110-11116
ISSN: 2040-3364
DOI: 10.1039/c8nr02381f
Crisp R., Kirkwood N., Grimaldi G., Kinge S., Siebbeles LDA., Houtepen AJ.:
Highly Photoconductive InP Quantum Dots Films and Solar Cells
In: ACS Applied Energy Materials 1 (2018), p. 6569-6576
ISSN: 2574-0962
DOI: 10.1021/acsaem.8b01453
Ganesan AA., Houtepen AJ., Crisp R.:
Quantum Dot Solar Cells: Small Beginnings Have Large Impacts
In: Applied Sciences 8 (2018), Article No.: ARTN 1867
ISSN: 2076-3417
DOI: 10.3390/app8101867
Grimaldi G., Crisp R., Ten Brinck S., Zapata F., Van Ouwendorp M., Renaud N., Kirkwood N., Evers WH., Kinge S., Infante I., Siebbeles LDA., Houtepen AJ.:
Hot-electron transfer in quantum-dot heterojunction films
In: Nature Communications 9 (2018), Article No.: ARTN 2310
ISSN: 2041-1723
DOI: 10.1038/s41467-018-04623-9
Kirkwood N., Monchen JOV., Crisp R., Grimaldi G., Bergstein HAC., Du Fosse I., Van Der Stam W., Infante I., Houtepen AJ.:
Finding and Fixing Traps in II-VI and III-V Colloidal Quantum Dots: The Importance of Z-Type Ligand Passivation
In: Journal of the American Chemical Society 140 (2018), p. 15712-15723
ISSN: 0002-7863
DOI: 10.1021/jacs.8b07783
Spoor FCM., Grimaldi G., Delerue C., Evers WH., Crisp R., Geiregat P., Hens Z., Houtepen AJ., Siebbeles LDA.:
Asymmetric Optical Transitions Determine the Onset of Carrier Multiplication in Lead Chalcogenide Quantum Confined and Bulk Crystals
In: Acs Nano 12 (2018), p. 4796-4802
ISSN: 1936-0851
DOI: 10.1021/acsnano.8b01530

Crisp R., Pach GF., Kurley JM., France RM., Reese MO., Nanayakkara SU., Macleod BA., Talapin DV., Beard MC., Luther JM.:
Tandem Solar Cells from Solution-Processed CdTe and PbS Quantum Dots Using a ZnTe-ZnO Tunnel Junction
In: Nano Letters 17 (2017), p. 1020-1027
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.6b04423
Kurley JM., Panthani MG., Crisp R., Nanayakkara SU., Pach GF., Reese MO., Hudson MH., Dolzhnikov DS., Tanygin V., Luther JM., Talapin DV.:
Transparent Ohmic Contacts for Solution-Processed, Ultrathin CdTe Solar Cells
In: ACS Energy Letters 2 (2017), p. 270-278
ISSN: 2380-8195
DOI: 10.1021/acsenergylett.6b00587
Marino E., Kodger TE., Crisp R., Timmerman D., Macarthur KE., Heggen M., Schall P.:
Repairing Nanoparticle Surface Defects
In: Angewandte Chemie International Edition 56 (2017), p. 13795-13799
ISSN: 1433-7851
DOI: 10.1002/anie.201705685
Yan Y., Crisp R., Gu J., Chernomordik BD., Pach GF., Marshall AR., Turner JA., Beard MC.:
Multiple exciton generation for photoelectrochemical hydrogen evolution reactions with quantum yields exceeding 100%
In: Nature Energy 2 (2017), Article No.: ARTN 17052
ISSN: 2058-7546
DOI: 10.1038/nenergy.2017.52

Crisp R., Callahan R., Reid OG., Dolzhnikov DS., Talapin DV., Rumbles G., Luther JM., Kopidakis N.:
Photoconductivity of CdTe Nanocrystal-Based Thin Films: Te2- Ligands Lead To Charge Carrier Diffusion Lengths Over 2 mu m
In: Journal of Physical Chemistry Letters 6 (2015), p. 4815-4821
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.5b02252
Crisp R., Kroupa DM., Marshall AR., Miller EM., Zhang J., Beard MC., Luther JM.:
Metal Halide Solid-State Surface Treatment for High Efficiency PbS and PbSe QD Solar Cells
In: Scientific Reports 5 (2015), Article No.: ARTN 9945
ISSN: 2045-2322
DOI: 10.1038/srep09945
Crisp R., Panthani M., Talapin DV., Luther JM.:
Understanding the role of chemical treatments and device architecture on ink-based CdTe solar cells
Miller E., Kroupa D., Crisp R., Marshall A., Zhang J., Schulz P., Kahn A., Luther J., Beard M., Perkins C., Van De Lagemaat J.:
Photoelectron and inverse photoelectron spectroscopy of PbS quantum dots
Yang Y., Yang M., Li Z., Crisp R., Zhu K., Beard MC.:
Comparison of Recombination Dynamics in CH3NH3PbBr3 and CH3NH3PbI3 Perovskite Films: Influence of Exciton Binding Energy
In: Journal of Physical Chemistry Letters 6 (2015), p. 4688-4692
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.5b02290
Zhang J., Chernomordik BD., Crisp R., Kroupa DM., Luther JM., Miller EM., Gao J., Beard MC.:
Preparation of Cd/Pb Chalcogenide Heterostructured Janus Particles via Controllable Cation Exchange
In: Acs Nano 9 (2015), p. 7151-7163
ISSN: 1936-0851
DOI: 10.1021/acsnano.5b01859
Zhang J., Crisp R., Gao J., Kroupa DM., Beard MC., Luther JM.:
Synthetic Conditions for High-Accuracy Size Control of PbS Quantum Dots
In: Journal of Physical Chemistry Letters 6 (2015), p. 1830-1833
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.5b00689

Crisp R., Panthani MG., Berry JJ., Rance WL., Duenow JN., Talapin DV., Luther JM.:
Nanoscale Engineering of Solution-processed CdTe Solar Cells using Nanocrystalline Precursors
Crisp R., Panthani MG., Rance WL., Duenow JN., Parilla PA., Callahan R., Dabney MS., Berry JJ., Talapin DV., Luther JM.:
Nanocrystal Grain Growth and Device Architectures for High-Efficiency CdTe Ink-Based Photovoltaics
In: Acs Nano 8 (2014), p. 9063-9072
ISSN: 1936-0851
DOI: 10.1021/nn502442g
Panthani MG., Kurley JM., Crisp R., Dietz TC., Ezzyat T., Luther JM., Talapin DV.:
High Efficiency Solution Processed Sintered CdTe Nanocrystal Solar Cells: The Role of Interfaces
In: Nano Letters 14 (2014), p. 670-675
ISSN: 1530-6984
DOI: 10.1021/nl403912w

Bult JB., Crisp R., Perkins CL., Blackburn JL.:
Role of Dopants in Long-Range Charge Carrier Transport for p-Type and n-Type Graphene Transparent Conducting Thin Films
In: Acs Nano 7 (2013), p. 7251-7261
ISSN: 1936-0851
DOI: 10.1021/nn402673z
Crisp R., Schrauben JN., Beard MC., Luther JM., Johnson JC.:
Coherent Exciton Delocalization in Strongly Coupled Quantum Dot Arrays
In: Nano Letters 13 (2013), p. 4862-4869
ISSN: 1530-6984
DOI: 10.1021/nl402725m
Weigand C., Crisp R., 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
In: Thin Solid Films 545 (2013), p. 124-129
ISSN: 0040-6090
DOI: 10.1016/j.tsf.2013.07.052

Dr. Ryan Crisp

Publications

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