Ultrafast Dynamics Group
Frédéric Laquai's Group


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Total result(s) found: 60
  • BODIPY-pyrene and perylene dyads as heavy atom-free singlet oxygen sensitizers​

    M.A. Filatov, S. Karuthedath, P.M. Polestshuk, S. Callaghan, T. Wiesner, K.J. Flanagan, F. Laquai and M.O. Senge
    ChemPhotoChem 2018,
    DOI: 10.1002/cptc.201800020
charge transfer, heavy-atom-free sensitizer, photo- induced electron transfer, singlet oxygen, triplet excited state
  • ​Efficient Long - Range Electron Transfer Processes in Polyfluorene – Perylene Diimide Blends

    A. Isakova, S. Karuthedath, T. Arnold, J. Howse, P. D. Topham, D. T. W. Toolan, F. Laquai and L. Lüer,

    Nanoscale, 2018, Accepted Manuscript​, 

    DOI: 10.1039/C8NR01064A.


perylene diimide (PDI), polyfluorene (PFO)
  • Triphenylamine-Based Push–Pull σ–C60 Dyad As Photoactive Molecular Material for Single-Component Organic Solar Cells: Synthesis, Characterizations, and Photophysical Properties.
    A. Labrunie, J. Gorenflot, M. Babics, O. Alévêque, S. Dabos-Seignon, A. H. Balawi, Z. Kan, M. Wohlfahrt, E. Levillain, P. Hudhomme, P. M. Beaujuge, F. Laquai, C. Cabanetos, and P. Blanchard.
    Chemistry of Materials Article ASAP, 2018,
    DOI: 10.1021/acs.chemmater.8b01117

  • Mixed Domains Enhance Charge Generation and Extraction in Bulk‐Heterojunction Solar Cells with Small‐Molecule Donors.
    O. Alqahtani, M. Babics, J. Gorenflot, V. Savikhin, T. Ferron, A.H. Balawi, A. Paulke, Z. Kan, M. Pope, A.J. Clulow, J. Wolf, P.L. Burn, I.R. Gentle, D. Neher, M.F. Toney, F. Laquai, P.M. Beaujuge, B.A. Collins

    Adv. Energy Mater. 2018, 1702941 DOI:10.1002/aenm.201702941

Charge transport, domain purity, microscopy, mixed domains, organic solar cells, photovoltaic devices, resonant X-ray scattering, small molecules, transient spectroscopy
  • Thermal Annealing Reduces Geminate Recombination in TQ1:N2200 All-Polymer Solar Cells​

    S. Karuthedath, A. Melianas, Z. Kan, V. Pranculis, M. Wohlfahrt, J.I. Khan, J. Gorenflot, Y. Xia, O. Inganäs, V. Gulbinas, M. Kemerink, and F. Laquai
    Journal of Materials Chemistry A, 2018.
    DOI: 10.1039/c8ta01692e​
TQ1:N2200, Polymer Solar Cells
CDTBM, IDTTBM, BHJ solar cells
  • Control of triplet state generation in heavy atom-free BODIPY-anthracene dyads by media polarity and structural factors

    M.A. Filatov, S. Karuthedath, P.M. Polestshuk, S. Callaghan, K.J. Flanagan, M. Telitchko, T. Wiesner, F. Laquai, M.O. Senge, 
    Phys. Chem. Chem. Phys. 2018
    DOI: 10.1039/C7CP08472B
Boron dipyrromethene (BODIPY) dyes, Ultrafast pump-probe spectroscopy
  • High efficiency PCBM solar cells enabled by a spontaneously formed mesostructured CuSCN-nanowire heterointerface

    W.-Y. Sit, F. Eisner, Y.-H. Lin, Y. Firdaus, A. Seitkhan, A. Balawi, F. Laquai, C. Burgess, M.A. McLachlan, G. Volonakis, F. Giustino, and T.D. Anthopoulos
    Adv. Sci. 2018, 10.1002/advs.201700980
copper (I) thiocyanate, fullerenes, mesostructured heterointerfaces, PCBM, solar cells
  • From Recombination Dynamics to Device Performance: Quantifying the Efficiency of Exciton Dissociation, Charge Separation, and Extraction in Bulk Heterojunction Solar Cells with Fluorine-Substituted Polymer Donors

    J. Gorenflot, A. Paulke, F. Piersimoni, J. Wolf, Z. Kan, F. Cruciani, A. El Labban, D. Neher, P.M. Beaujuge, F. Laquai.
    Adv. Energy Mater. 2018, DOI: 10.1002/ aenm.201701678

bulk heterojunction, charge generation yield, charge recombination yield, polymer solar cells, transient absorption spectroscopy
  • Efficiency-limiting Processes in Cyclopentadithiophene-bridged Donor-Acceptor-type Dyes for Solid-State Dye-sensitized Solar Cells

    F. Hinkel, Y. Kim, Y. Zagraniarsky, F. Schlütter, D. Andrienko, K. Müllen, F. Laquai
    J. Chem. Phys.148, 044703, 2018. 
Solar cells, Photochemistry, Photoconductivity, Chemical, compounds, Spectroscopy
  • Charge Carrier Generation, Recombination, and Extraction in Polymer:Fullerene Bulk Heterojunction Organic Solar Cells

    Laquai, F., Andrienko, D., Deibel, C., Neher, D
    Advances in Polymer Science 272, Springer 2017, pp. 267-291​

Charge extraction, Charge generation, Charge recombination, Organic solar cells, PBT7, PBTTT, PCPDTBT
  • Polymer Main-Chain Substitution Effects on the Efficiency of Nonfullerene BHJ Solar Cells

    Y. Firdaus, L.P. Maffei, F. Cruciani, M.A. Müller, S. Liu, S. Lopatin, N. Wehbe, G.O.N. Ndwaja, A. Amassian, F. Laquai, P.M. Beaujuge.
    Adv. Energy Mater. 2017, 7, 1700834
    DOI: 10.1002/aenm.201700834

3,4-difluorothiophene, benzo[1,2-b:4,5-b′]dithiophene (BDT), ITIC, nonfullerene acceptor, organic photovoltaics, polymer solar cells
  • Thieno[3,4-c]pyrrole-4,6-dione–based Polymer Acceptors for High Open-Circuit Voltage All-Polymer Solar Cells

    S. Liu, X. Song, S. Thomas, Z. Kan, F. Cruciano, F. Laquai, J.-L. Bredas, P.M. Beaujuge
    Adv. Energy Mater. 2017, 7, 1602574
3,4-difluorothiophene; all-polymer solar cells; organic photovoltaics; polymer acceptors; thieno[3,4-c]pyrrole-4,6-dione
  • ​Solvent Vapor Annealing-Mediated Crystallization Directs Charge Generation, Recombination and Extraction in BHJ Solar Cells 

    M. Babics, R.-Z. Liang, K. Wang, F. Cruciani, Z. Kan, M. Wohlfahrt, M.-C. Tang, F. Laquai, and P.M. Beaujuge.
    Chem. Mater. 2017, DOI: 10.1021/acs.chemmater.7b04286​

Charge Generation, Recombination, Extraction, Solar Cells
  • Molecular Doping of the Hole-Transporting Layer for Efficient, Single-Step-Deposited Colloidal Quantum Dot Photovoltaics 

    A.R. Kirmani, F.P. Garcia De Arquer, J.Z. Fan, J.I. Khan, G. Walters, S. Hoogland, N. Wehbe, M.M. Said, S. Barlow, F. Laquai,
    E.H. Sargent, A. Amassian.

    ACS Energy Lett. 2017, 2 (9), 1952-1959
    DOI: 10.1021/acsenergylett.7b00540
Molecular Doping, Quantum Dot Photovoltaics
  • Performance limitations in thieno[3,4-c]pyrrole-4,6-dione-based polymer:ITIC solar cells
    Fan Yang, Deping Qian, Ahmed Hesham Balawi, Yang Wu, Wei Ma, Frédéric Laquai, Zheng Tang, Fengling Zhang and Weiwei Li
    Phys. Chem. Chem. Phys., 2017,19, 23990-23998 
Voltage losses, Quantum Efficiency Losses, Thin Film Morphology
  • Improved Morphology and Efficiency of n–i–p Planar Perovskite Solar Cells by Processing with Glycol Ether Additives​
    Esma Ugur, Arif D. Sheikh†, Rahim Munir, Jafar I. Khan, Dounya Barrit, Aram Amassian, Frédéric Laquai

    ACS Energy Lett.20172, pp 1960–1968
Perovskite, Glycol Ether Additives, two-step proccess
  • Trap-Free Hot Carrier Relaxation in Lead–Halide Perovskite Films.
    Simon A. Bretschneider, Frédéric Laquai, and Mischa Bonn
    J. Phys. Chem. C, 2017, 121 (21), pp 11201–11206 
Lead-Halide, Perovskite, Hot carriers
  • Generation of Triplet Excited States via Photoinduced Electron Transfer in meso-anthra-BODIPY: Fluorogenic Response Towards Singlet Oxygen in Solution and in Vitro
    Mikhail A. Filatov, Safakath Karuthedath, Pavel M. Polestshuk, Huguette Savoie, Keith J. Flanagan, Cindy Sy, Elisabeth Sitte, Maxime Telitchko, Frédéric Laquai , Ross W. Boyle, Mathias O. Senge
    J. Am. Chem. Soc., 2017, 139 (18), pp 6282–6285 
Triplet Excited States, Photoinduced Electron Transfer
  • Programmable and coherent crystallization of semiconductors​

    Liyang Yu, Muhammad R. Niazi, Guy O. Ngongang Ndjawa, Ruipeng Li, Ahmad R. Kirmani, Rahim Munir, Ahmed H. Balawi, Frédéric Laquai and Aram Amassian

    Science Advances  03 Mar 2017:
    Vol. 3, no. 3, e1602462
    DOI: 10.1126/sciadv.1602462

crystallizationpolycrystalline thin filmsamorphous thin filmssmall-molecule organic semiconductorsOrganic Electronicsorganic thin film transistorshomogeneous nucleationpatterningclassical nucleation theorynucleation and growth
  • Highly Efficient Electrocatalysts for Oxygen Reduction Reaction Based on 1D Ternary Doped Porous Carbons Derived from Carbon Nanotube Directed Conjugated Microporous Polymers

    Y. He, D. Gehrig, F. Zhang, C. Lu, C. Zhang, M. Cai, Y. Wang, F. Laquai, X. Zhuang, X. Feng,​ Adv. Funct. Mater. 2016, 26, 8255-8265.
Electrocatalysts, Carbon nanotube, Microporous polymers
  • Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence

    M. Gerhard, D. Gehrig, I.A. Howard, A.P. Arndt, M. Bilal, A. Rahimi-Iman, U. Lemmer, F. Laquai, M. Koch,
    Proceedings of SPIE - The International Society for Optical Engineering, Volume 9895, 2016, Article number 98950H
Organic solar cells, Time-resolved photoluminescence
  • Hybrid organic–inorganic inks flatten the energy landscape in colloidal quantum dot solids
    Mengxia Liu, Oleksandr Voznyy, Randy Sabatini, F. Pelayo García de Arquer, Rahim Munir, Ahmed Hesham Balawi, Xinzheng Lan, Fengjia Fan, Grant Walters, Ahmad R. Kirmani, Sjoerd Hoogland, Frédéric Laquai, Aram Amassian and Edward H. Sargent
    Nature Materials

Quantum Dots, Solar Cells, Bandtail,
Electron-transporting layers, ETM, organohalide, perovskite, solar cells, hydrophobic, cross-linked, Photothermal Deflection Spectroscopy, PDS
Solution-processed OPV, non-fullerene acceptor, fullerene-free P3HT
donor–acceptor–donor, naphthalene-diimide, J-aggregation
nonporous triazine, solid state synthetic
perovskite, photovoltaic devices, piezoresponse force microscopy
MEH–PPV, nanocomposites
Small Molecule, Acceptors, OPV
  • Charge Carrier Transport and Photogeneration in P3HT:PCBM Photovoltaic Blends

    F. Laquai, D. Andrienko, R. Mauer, and P.W.M. Blom, Macromol. Rap. Comm. 2015, 36, 1001-1025.
Poly(3-hexylthiophene), Charge recombination, Charge transport, DFT calculations, Organic solar cells
  • J-aggregation, its impact on excited state dynamics and unique solvent effects on macroscopic assembly of a core-substituted naphthalenediimide

    H. Kar, D.W. Gehrig, F. Laquai, S. Ghosh,
    Nanoscale 2015, 7, 6729-6736.
Excited state dynamics, Transient absorption spectroscopy, Macroscopic
  • Conjugated Microporous Polymers with Dimensionality-Controlled Heterostructures for Green Energy Devices

    X. Zhuang, D. Gehrig, N. Forler, H. Liang, M. Wagner, M. R. Hansen, F. Laquai, F. Zhang, and X. Feng, Adv. Mater. 2015, 27, 3789-3796.
Porous polymers, Polymeric material, Fourier transform infrared (FTIR) spectra
  • Effect of Charge Transfer in Magnetic-Plasmonic Au@MOx (M = Mn, Fe) Heterodimers on the Kinetics of Nanocrystal Formation

    I. Schick, D. Gehrig, M. Montigny, B. Balke, M. Panthöfer, A. Henkel, F. Laquai, and W. Tremel, Chem. Mater. 2015, 27, 4877-4884.​
Heteronanoparticles, Nanomaterials, Heterodimer.
  • Interplay between singlet and triplet excited states in a conformationally locked donor-acceptor dyad

    M.A. Filatov, F. Etzold, D. Gehrig, F. Laquai, D. Busko, K. Landfester, S. Baluschev,
    Dalton Transactions 2015, 44, 19207 – 19217.
Steady-state, Time-resolved photoluminescence spectroscopy
  • A spiro-bifluorene based 3D electron acceptor with dicyanovinylene substitution for solution processed non-fullerene organic solar cells

    D. Xia, D. Gehrig, X. Guo, M. Baumgarten, F. Laquai, and K. Müllen
    J. Mater. Chem. A 2015, 3, 11086-11092. 

Electronic supplementary, Organic solar cells
  • Charge Carrier Generation Followed by Triplet State Formation, Annihilation, and Carrier Recreation in PBDTTT-C:PC60BM Photovoltaic Blends

    D. Gehrig, I.A. Howard, and F. Laquai
    J. Phys. Chem. C, 2015, 119 (24), pp 13509–13515
    DOI: 10.1021/acs.jpcc.5b03467
carrier dynamics, triplet state dynamics, polymer, PBDTTT-C/PC60
  • Photovoltaic polymer-fullerene blends: Terahertz carrier dynamics and device performance

    Z. Jin, D. Gehrig, C. Dyer-Smith, E.J. Heilweil, F. Laquai, M. Bonn, D. Turchinovich,
    Conference on Lasers and Electro-Optics Europe - Technical Digest, Volume 2015 - August, 10 August 2015, Article number 7183909. 
Terahertz spectroscopy, Ultrafast spectroscopy, Polymers
  • Photo-generated carriers lose energy during extraction from polymer-fullerene solar cells

    Armantas Melianas, Fabian Etzold, Tom J. Savenije, Frédéric Laquai, Olle Inganäs, Martijn Kemerink
    Nature Communications
    Article number:
Photo-generated Charges, Thermal Equilibrium, Thermalization, time-resolved optical spectroscopy
  • Triplet state formation in photovoltaic blends of DPP-type copolymers and PC71BM

    Ochsmann JR, Chandran D, Gehrig DW, Anwar H, Madathil PK, Lee KS, Frédéric Laquai 

    Macromol Rapid Commun. 2015 Jun;36(11):1122-8.

    DOI: 10.1002/marc.201400714​

DPP Polymers, Charge Generation, Organic Photovoltaics, Transient Absorption Spectroscopy, Triplet State Formation
  • The Impact of Donor–Acceptor Phase Separation on the Charge Carrier Dynamics in pBTTT:PCBM Photovoltaic Blends

    Dominik W. Gehrig, Ian A. Howard, Sean Sweetnam, Timothy M. Burke,Michael D. McGehee, Frédéric Laquai

    Macromol. Rapid Commun. 2015, 36, 1054−1060

    DOI: 10.1002/marc.201500112​ 

Carrier Dynamics, pBTTT, Phase Separation, Polymer Solar Cells, Transient Absorption Spectroscopy
  • ​Sub-ns triplet state formation by non-geminate recombination in PSBTBT:PC70BM and PCPDTBT:PC BM organic solar cells

    Fabian Etzold, Ian A. Howard, Nina Forler, Anton Melnyk, Denis Andrienko, Michael Ryan Hansen and Frédéric Laquai

    Energy Environ. Sci., 2015,8, 1511-152

    DOI: 10.1039/C4EE03630A​​​​

Solid-State Morphology, Charge Carrier Dynamics, Multivariate Curve Resolution, Transient Absorption Spectroscopy
  • Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells

    Clare Dyer-Smith, Ian A. Howard, Clément Cabanetos, Abdulrahman El Labban, Pierre M. Beaujuge, and Frédéric Laquai
    Advanced Energy Materials, Volume 5, Issue 9, (2015)
    DOI 10.1002/aenm.201401778
Charge Generation, PBDTTPD, Polymer Solar Cells, Structure–Property Relationships, Transient Absorption Spectroscopy
  • High open-circuit voltage small-molecule p-DTS(FBTTh2)2:ICBA bulk heterojunction solar cells – morphology, excited-state dynamics, and photovoltaic performance

    Aung Ko Ko Kyaw, Dominik Gehrig, Jie Zhang, Ye Huang, Guillermo C. Bazan, Frédéric Laquai, Thuc-Quyen Nguyen,
    J. Mater. Chem. A 2015, 3, 1530-1539​

Bulk Heterojunction, Solar Cells, Solution-Processable Small Molecule Donor, Transient Absorption Spectroscopy
  • All-round perovskites

    F. Laquai,
    Nat. Mater. 2014, 13, 429-430.
Amplified spontaneous emission, perovskites
  • Self-Assembly of Carboxylic Acid Appended Naphthalene Diimide Derivatives with Tunable Luminescent Color and Electrical Conductivity

    M.R. Molla, D. Gehrig, L. Roy, V. Kamm, A. Paul, F. Laquai, S. Ghosh, Chem. Eur. J. 2014, 20 (3), 760-771.
Aggregation, Chromophores, Hydrogen bonds, Luminescence, Self-assembly
  • Multifunctional Two-Photon Active Silica-Coated Au@MnO Janus Particles for Selective Dual Functionalization and Imaging

    I. Schick, S. Lorenz, D. Gehrig, A.-M. Schilmann, H. Bauer, M. Panthöfer, K. Fischer, D. Strand, F. Laquai, W. Tremel
    J. Am. Chem. Soc. 2014, 136 (6), 2473–2483.
powder X-ray diffraction, Au@MnO@SiO2
  • Tuning reductive and oxidative photoinduced electron transfer in amide linked anthraquinone-porphyrin-ferrocene architectures

    J. Melomedov, J. R. Ochsmann, M. Meister, F. Laquai, K. Heinze, Eur. J. Inorg. Chem. 2014, 2014, 11, 1984-2001.
Electron transfer, Density functional calculations, Substituent effects, Porphyrinoids, Quinones
  • Influence of triplet excitons on the lifetime of polymer-based organic light emitting diodes

    O. Pekkola, A. Gassmann, F. Etzold, F. Laquai and H. von Seggern,
    phys. stat. sol. (a) 2014, DOI: 10.1002/pssa.201330411.
Device lifetime, Excitons, Organic light-emitting diodes, Polymers
  • Aminoferrocene and Ferrocene Amino Acid as Electron Donors in Modular Porphyrin–Ferrocene and Porphyrin–Ferrocene–Porphyrin Conjugates

    J. Melomedov, J.R. Ochsmann, M. Meister, F. Laquai and K. Heinze,
    Eur. J. Inorg. Chem. 2014, 18, 2902-2915.
Artificial photosynthesis, Energy transfer, Electron transfer, Metallocenes, Porphyrins
  • A Heteroleptic Push-Pull Substituted Iron(II) Bis(tridentate) Complex with Low Energy Charge Transfer States

    A.K.C. Mengel, C. Förster, A. Breivogel, K. Mack, J.R. Ochsmann, F. Laquai, V. Ksenofontov, and Heinze,
     Chem. Eur. J. 2014, 21 (2), 704-714.​

Charge transfer, Excited states, Iron, Ligand field splitting, Tridentate ligands
  • Inorganic Janus particles for biomedical applications

    I. Schick, S. Lorenz, D. Gehrig, S. Tenzer, W. Storck, K. Fischer, D. Strand, F. Laquai, W. Tremel,
    Beilstein J. Nanotech. 2014, 5, 2346-2362

Bioimaging (CT, MRI, Multi-photon), Hetero-nanoparticles, Janus particles, Protein corona, Synthesis
  • Correlated Donor/Acceptor Crystal Orientation Controls Photocurrent Generation in All-Polymer Solar Cells

    M. Schubert, B. A. Collins, H. Mangold, I. A. Howard, W. Schindler, K. Vandewal, S. Roland, J. Behrends, F. Kraffert, R. Steyrleuthner, Z. Chen, K. Fostiropoulos, R. Bittl, A. Salleo, A. Facchetti, F. Laquai, H. W. Ade, and D. Neher,
    Adv. Funct. Mater. 2014, 24, 4068-4081.

Polymer Solar Cells, X-ray
  • Nonequilibrium Charge Dynamics in Organic Solar Cells

    I.A. Howard, F. Etzold, F. Laquai, M. Kemerink,
     Adv. Energy Mater. 2014, 4, DOI: 10.1002/aenm.201301743.​ 
Charge Dynamics, Organic Solar Cells, Ultrafast transient spectroscopy
  • Modification of the Active Layer/PEDOT:PSS Interface by Solvent Additives Resulting in Improvement of Organic Solar Cells Performance

    O. Synooka, F. Kretschmer, M. Hager, M. Himmerlich, S. Krischok, D. Gehrig, F. Laquai, U. Schubert, G. Gobsch and H. Hoppe,
    ACS Applied Materials & Interfaces 2014, 6 (14), 11068-11081.
Additives, Copolymer, Dipole moment, Morphology, PEDOT:PSS, Solar cell
  • Bimolecular Crystals of Amorphous Polymer:PCBM Intercalated Structure for Improving PPV-based Organic Photovoltaic Cells

    K. Lim, J. Park, H. Mangold, F. Laquai, T. Choi, and T. Lee,
    ChemSusChem 2014, 8 (2), 337-344.
Absorption, Electron transfer, Polymers,Thin films, X-ray diffraction
  • Ultrafast Terahertz Photoconductivity of Photovoltaic Polymer-Fullerene Blends: A Comparative Study Correlated with Photovoltaic Device Performance

    Z. Jin, D. Gehrig, C. Dyer-Smith, E.J. Heilweil, F. Laquai, M. Bonn, D. Turchinovich,
    J. Phys. Chem. Lett. 2014, 5 (21), 3662-3668.
Charge transfer, Organic photovoltaics, Photoconductivity, Semiconducting polymers, Terahertz spectroscopy
  • Efficiency-Limiting Processes in Low-Bandgap Polymer:Perylene Diimide Photovoltaic Blends
    Dominik W. Gehrig, Steffen Roland, Ian A. Howard, Valentin Kamm, Hannah Mangold, Dieter Neher, and Frédéric Laquai
    J. Phys. Chem. C2014118 (35), pp 20077–20085
    DOI: 10.1021/jp503366m
Perylene Diimide, Charge Generation, Charge Recombination, Transient Absorption Spectroscopy
  • Control of charge generation and recombination in ternary polymer/polymer:fullerene photovoltaic blends using amorphous and semi-crystalline copolymers as donors

    Hannah Mangold, Artem A. Bakulin, Ian A. Howard, Christian Kästner, Daniel A. M. Egbe, Harald Hoppe and Frédéric Laquai

    Phys. Chem. Chem. Phys., 2014,16, 20329-20337

    DOI: 10.1039/C4CP01883D

Charge Generation, Charge Recombination, Charge-Transfer States, Geminate Recombination, Non-Geminate Recombination
  • The Effect of Solvent Additive on the Charge Generation and Photovoltaic Performance of a Solution-Processed Small Molecule: Perylene Diimide Bulk Heterojunction Solar Cell
    Alexander Sharenko, Dominik Gehrig, Frédéric Laquai and Thuc-Quyen Nguyen
    Chem. Mater., 2014, 26 (14), pp 4109–4118
    DOI: 10.1021/cm5010483
Small Molecule Donor, Perylene Diimide (PDI) Electron Acceptor, Organic Photovoltaic, Solvent Additives