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Bleeker, J.J. (author), Kahn, A.P. (author), Baumgartner, L.M. (author), Grozema, F.C. (author), Vermaas, D.A. (author), Jager, W.F. (author)Spatiotemporal pH imaging using fluorescence lifetime imaging microscopy (FLIM) is an excellent technique for investigating dynamic (electro)chemical processes. However, probes that are responsive at high pH values are not available. Here, we describe the development and application of dedicated pH probes based on the 1-methyl-7-amino...journal article 2023
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Wei, Z. (author), Mulder, J.T. (author), Dubey, R. (author), Evers, W.H. (author), Jager, W.F. (author), Houtepen, A.J. (author), Grozema, F.C. (author)Understanding the interplay between the kinetics and energetics of photophysical processes in perovskite-chromophore hybrid systems is crucial for realizing their potential in optoelectronics, photocatalysis, and light-harvesting applications. By combining steady-state optical characterizations and transient absorption spectroscopy, we have...journal article 2023
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du Fossé, I. (author), Mulder, J.T. (author), Almeida, Guilherme (author), Spruit, Anne G.M. (author), Infante, Ivan (author), Grozema, F.C. (author), Houtepen, A.J. (author)One of the most promising properties of lead halide perovskite nanocrystals (NCs) is their defect tolerance. It is often argued that, due to the electronic structure of the conduction and valence bands, undercoordinated ions can only form localized levels inside or close to the band edges (i.e., shallow traps). However, multiple studies have...journal article 2022
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Wei, Z. (author), Philip, A.M. (author), Jager, W.F. (author), Grozema, F.C. (author)A series of three perylenemonoimide-p-oligophenylene-dimethylaniline molecular dyads undergo photoinduced charge separation (CS) with anomalous distance dependence as a function of increasing donor-acceptor (DA) distances. A comprehensive experimental and computational investigation of the photodynamics in the donor-bridge-acceptor (DBA)...journal article 2022
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Denis, Paul Henry (author), Mertens, Martijn (author), Van Gompel, Wouter T.M. (author), Maufort, Arthur (author), Mertens, Sigurd (author), Wei, Z. (author), Van Landeghem, Melissa (author), Gielen, Sam (author), Grozema, F.C. (author)3D hybrid perovskites (APbX<sub>3</sub>) have made a significant impact on the field of optoelectronic materials due to their excellent performance combined with facile solution deposition and up-scalable device fabrication. Nonetheless, these materials suffer from environmental instability. To increase material stability, the organic cation ...journal article 2022
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Ornago, L. (author), Kamer, Jerry (author), El Abbassi, M. (author), Grozema, F.C. (author), van der Zant, H.S.J. (author)Switching effects are key elements in the design and characterization of nanoscale molecular electronics systems. They are used to achieve functionality through the transition between different conducting states. In this study, we analyze the presence of switching events in reference molecular systems, which are not designed to have switching...journal article 2022
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Effect of Co-Solvents on the Crystallization and Phase Distribution of Mixed-Dimensional PerovskitesCaiazzo, Alessandro (author), Datta, Kunal (author), Jiang, Junke (author), Gelvez Rueda, M.C. (author), Li, Junyu (author), Ollearo, Riccardo (author), Vicent-Luna, José Manuel (author), Tao, Shuxia (author), Grozema, F.C. (author)Solution-processed quasi-2D perovskites are promising for stable and efficient solar cells because of their superior environmental stability compared to 3D perovskites and tunable optoelectronic properties. Changing the number of inorganic layers (n) sandwiched between the organic spacers allows for tuning of the bandgap. However, narrowing...journal article 2021
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Wei, Z. (author), Sharma, Sushil (author), Philip, A.M. (author), Sengupta, Sanchita (author), Grozema, F.C. (author)Donor-bridge-acceptor systems based on boron dipyrromethene (BODIPY) are attractive candidates for bio-imagining and sensing applications because of their sensitivity to temperature, micro-viscosity and solvent polarity. The optimization of the properties of such molecular sensors requires a detailed knowledge of the relation between the...journal article 2021
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Gelvez Rueda, M.C. (author), Peeters, Sicco (author), Wang, Peng Cheng (author), Felter, K.M. (author), Grozema, F.C. (author)In this work, we show that the quality of the precursor and the thin film preparation strongly affect the optoelectronic properties of the 2D perovskite BA<sub>2</sub>PbI<sub>4</sub>. 2D perovskites with alkylammonium organic cations such as butylammonium (BA) are relatively soft structures that exhibit large dynamic disorder and phase...journal article 2020
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Fridriksson, M.B. (author), Maheswari, S. (author), Grozema, F.C. (author)Recently two-dimensional (2D) hybrid organic-inorganic perovskites have attracted a lot of interest as more stable analogues of their three-dimensional counterparts for optoelectronic applications. However, a thorough understanding of the effect that this reduced dimensionality has on dynamical and structural behavior of individual parts of...journal article 2020
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Fridriksson, M.B. (author), Van Der Meer, Nadia (author), De Haas, Jiska (author), Grozema, F.C. (author)Two-dimensional (2D) hybrid organic-inorganic perovskites are an interesting class of semi-conducting materials. One of their main advantages is the large freedom in the nature of the organic spacer molecules that separates the individual inorganic layers. The nature of the organic layer can significantly affect the structure and dynamics of...journal article 2020
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Gelvez Rueda, M.C. (author), Van Gompel, Wouter T.M. (author), Herckens, Roald (author), Lutsen, Laurence (author), Vanderzande, Dirk (author), Grozema, F.C. (author)Two-dimensional (2D) hybrid perovskites make up an emerging class of materials for optoelectronic applications in which inorganic octahedral layers are separated by nonconductive large organic cations. This leads to a high-dimensional and dielectric confinement and hence a high exciton binding energy, which severely limits their application...journal article 2020
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Perrin, M.L. (author), Eelkema, R. (author), Thijssen, J.M. (author), Grozema, F.C. (author), van der Zant, H.S.J. (author)In recent years, a wide range of single-molecule devices has been realized, enabled by technological advances combined with the versatility offered by synthetic chemistry. In particular, single-molecule diodes have attracted significant attention with an ongoing effort to increase the rectification ratio between the forward and reverse...review 2020
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Gelvez Rueda, M.C. (author), Fridriksson, M.B. (author), Dubey, R. (author), Jager, W.F. (author), van der Stam, W. (author), Grozema, F.C. (author)In this work we demonstrate a novel approach to achieve efficient charge separation in dimensionally and dielectrically confined two-dimensional perovskite materials. Two-dimensional perovskites generally exhibit large exciton binding energies that limit their application in optoelectronic devices that require charge separation such as solar...journal article 2020
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Vonk, Sander J.W. (author), Fridriksson, M.B. (author), Hinterding, Stijn O.M. (author), Mangnus, Mark J.J. (author), Van Swieten, Thomas P. (author), Grozema, F.C. (author), Rabouw, Freddy T. (author), van der Stam, W. (author)Metal-halide perovskite nanocrystals show promise as the future active material in photovoltaics, lighting, and other optoelectronic applications. The appeal of these materials is largely due to the robustness of the optoelectronic properties to structural defects. The photoluminescence quantum yield (PLQY) of most types of perovskite...journal article 2020
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Özen, Bilal (author), Candau, Nicolas (author), Temiz, C. (author), Grozema, F.C. (author), Fadaei Tirani, Farzaneh (author), Scopelliti, Rosario (author), Chenal, Jean Marc (author), Plummer, Christopher J.G. (author), Frauenrath, Holger (author)Polymer semiconductors show unique combinations of mechanical and optoelectronic properties that strongly depend on their microstructure and morphology. Here, we have used a model π-conjugated bithiophene repeat unit to incorporate optoelectronic functionality into an aliphatic polyamide backbone by solution-phase polycondensation....journal article 2020
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Gelvez Rueda, M.C. (author), Ahlawat, Paramvir (author), Merten, Lena (author), Jahanbakhshi, Farzaneh (author), Mladenović, Marko (author), Hinderhofer, Alexander (author), Dar, M. Ibrahim (author), Li, Yang (author), Grozema, F.C. (author)Layered hybrid perovskites have emerged as a promising alternative to stabilizing hybrid organic–inorganic perovskite materials, which are predominantly based on Ruddlesden-Popper structures. Formamidinium (FA)-based Dion-Jacobson perovskite analogs are developed that feature bifunctional organic spacers separating the hybrid perovskite slabs...journal article 2020
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Van Gompel, Wouter T.M. (author), Herckens, Roald (author), Denis, Paul Henry (author), Mertens, Martijn (author), Gelvez Rueda, M.C. (author), Van Hecke, Kristof (author), Ruttens, Bart (author), D’Haen, Jan (author), Grozema, F.C. (author)2D layered hybrid perovskites are currently in the spotlight for applications such as solar cells, light-emitting diodes, transistors and photodetectors. The structural freedom of 2D layered perovskites allows for the incorporation of organic cations that can potentially possess properties contributing to the performance of the hybrid as a...journal article 2020
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Benz, D. (author), Felter, K.M. (author), Köser, Jan (author), Thöming, Jorg (author), Mul, Guido (author), Grozema, F.C. (author), Hintzen, H.T.J.M. (author), Kreutzer, M.T. (author), van Ommen, J.R. (author)The role of Pt on photocatalytic substrates such as TiO<sub>2</sub> (P25) for the decomposition of organic pollutants is still controversial in the scientific community. The well-observed behavior of an optimum catalytic activity as a function of the Pt loading is usually explained by the shift from charge separation to charge recombination...journal article 2020