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Dubey, R. (author), Inan, D. (author), Philip, A.M. (author), Grozema, F.C. (author), Jager, W.F. (author)Two light-harvesting antenna molecules were obtained by positioning naphthalene monoimide energy donors at the imide position, instead of the bay positions, of perylene imide energy acceptors. Such rational design resulted in a complete suppression of parasitic intramolecular charge transfer without compromising the desired ultrafast rates of...journal article 2020
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Felter, K.M. (author), Fravventura, Maria C. (author), Koster, Emma (author), Abellon, R.D. (author), Savenije, T.J. (author), Grozema, F.C. (author)In this contribution we demonstrate a solid-state approach to triplet-triplet annihilation upconversion for application in a solar cell device in which absorption of near-infrared light is followed by direct electron injection into an inorganic substrate. We use time-resolved microwave photoconductivity experiments to study the injection of...journal article 2020
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Jahanbakhshi, Farzaneh (author), Mladenović, Marko (author), Kneschaurek, Ekaterina (author), Merten, Lena (author), Gelvez Rueda, M.C. (author), Ahlawat, Paramvir (author), Li, Yang (author), Carlsen, B.I. (author), Grozema, F.C. (author)Layered hybrid perovskites comprising adamantyl spacer (A) cations based on the A<sub>2</sub>FA<sub>n−1</sub>Pb<sub>n</sub>I<sub>3n+1</sub>(n= 1-3, FA = formamidinium) compositions have recently been shown to act as promising materials for photovoltaic applications. While the corresponding perovskite solar cells show performances and...journal article 2020
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Diedenhofen, S.L. (author), Bernechea, Maria (author), Felter, K.M. (author), Grozema, F.C. (author), Siebbeles, L.D.A. (author)Solution-processed AgBiS<sub>2</sub> nanocrystal films are a promising material for nontoxic, earth-abundant solar cells. While solar cells with good device efficiency are demonstrated, so far, hardly anything is known about charge generation, transport, and recombination processes in these films. Here, a photoinduced time-resolved microwave...journal article 2019
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Kamminga, Machteld E. (author), Gelvez Rueda, M.C. (author), Maheswari, S. (author), van Droffelaar, I.S. (author), Baas, Jacob (author), Blake, Graeme R. (author), Grozema, F.C. (author), Palstra, Thomas T.M. (author)We synthesize single crystals of a new 2,5-dimethylanilinium tin iodide organic-inorganic hybrid compound and 2,5-dimethylanilinium triiodide. Single-crystal X-ray diffraction reveals that the hybrid grows as a unique rhombohedral structure consisting of one-dimensional chains of SnI<sub>6</sub>-octahedra that share corners and edges to build...journal article 2019
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Inan, D. (author), Dubey, R. (author), Jager, W.F. (author), Grozema, F.C. (author)The excited-state dynamics of perylene-based bichromophoric light harvesting antenna systems has been tailored by systematic modification of the molecular structure and by using solvents of increasing polarity in the series toluene, chloroform, and benzonitrile. The antenna systems consist of blue light absorbing naphthalene monoimide (NMI)...journal article 2019
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Felter, K.M. (author), Grozema, F.C. (author)Singlet fission (SF) involves the conversion of one excited singlet state into two lower excited triplet states and has received considerable renewed attention over the past decade. This Perspective highlights recent developments and emerging concepts of SF in solid-state crystalline materials. Recent experiments showed the crucial role of...journal article 2019
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Felter, K.M. (author), Caselli, V.M. (author), Gunbas, D.D. (author), Savenije, T.J. (author), Grozema, F.C. (author)Two of the key parameters that characterize the usefulness of organic semiconductors for organic or hybrid organic/inorganic solar cells are the mobility of charges and the diffusion length of excitons. Both parameters are strongly related to the supramolecular organization in the material. In this work we have investigated the relation...journal article 2019
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Maheswari, S. (author), Fridriksson, M.B. (author), Seal, Sayan (author), Meyer, Jörg (author), Grozema, F.C. (author)The rotational dynamics of an organic cation in hybrid halide perovskites is intricately linked to the phase transitions that are known to occur in these materials; however, the exact relation is not clear. We have performed detailed model studies on methylammonium lead iodide and formamidinium lead iodide to unravel the relation between...journal article 2019
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Dubey, R. (author), Eustace, S.J. (author), Van Mullem, Jesse S. (author), Sudhölter, Ernst J. R. (author), Grozema, F.C. (author), Jager, W.F. (author)We report herein a versatile and user-friendly synthetic methodology based on sequential functionalization that enables the synthesis of previously unknown perylene bisimide (PBI) dyes with up to five different substituents attached to the perylene core (e.g., compound 15). The key to the success of our strategy is a highly efficient...journal article 2019
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Felter, K.M. (author), Dubey, R. (author), Grozema, F.C. (author)Perylene diimides (PDIs) are attractive chromophores that exhibit singlet exciton fission (SF) and have several advantages over traditional SF molecules such as tetracene and pentacene; however, their photophysical properties relating to SF have received only limited attention. In this study, we explore how introduction of bulky bromine atoms...journal article 2019
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Marchal, Nadège (author), Van Gompel, Wouter (author), Gelvez Rueda, M.C. (author), Vandewal, Koen (author), Van Hecke, Kristof (author), Boyen, Hans Gerd (author), Conings, Bert (author), Herckens, Roald (author), Maheswari, S. (author), Grozema, F.C. (author)Low-dimensional lead halide hybrid perovskites are nowadays in the spotlight because of their improved stability and extensive chemical flexibility compared to their 3D perovskite counterparts, the current challenge being to design functionalized organic cations. Here, we report on the synthesis and full characterization of a perovskite-like...journal article 2019
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Maheswari, S. (author), Patwardhan, Sameer (author), Schatz, George C. (author), Renaud, Nicolas (author), Grozema, F.C. (author)We present ab initio calculations (DFT and SOC-G0W0) of the optoelectronic properties of different hybrid-halide perovskites, namely X-PbI3 (X = methylamonimum, formamidinium, guanidinium, hydrazinium, and hydroxylammonium). These calculations shed new light on how the substitution of different organic cations in the material influences its...journal article 2019
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Bartesaghi, D. (author), Slavney, Adam H. (author), Gelvez Rueda, M.C. (author), Connor, Bridget A. (author), Grozema, F.C. (author), Karunadasa, Hemamala I. (author), Savenije, T.J. (author)Double perovskites, comprising two different cations, are potential nontoxic alternatives to lead halide perovskites. Here, we characterized thin films and crystals of Cs<sub>2</sub>AgBiBr<sub>6</sub> by time-resolved microwave conductance (TRMC), which probes formation and decay of mobile charges upon pulsed irradiation. Optical excitation...journal article 2018
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Maheswari, S. (author), Savenije, T.J. (author), Renaud, N. (author), Grozema, F.C. (author)Two-dimensional (2D) halide perovskites are a class of materials in which 2D layers of perovskite are separated by large organic cations. Conventionally, the 2D perovskites incorporate organic cations as spacers, but these organic cations also offer a route to introduce specific functionality in the material. In this work, we demonstrate, by...journal article 2018
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Herckens, Roald (author), Van Gompel, Wouter T.M. (author), Song, Wenya (author), Gelvez Rueda, M.C. (author), Maufort, Arthur (author), Ruttens, Bart (author), D'Haen, Jan (author), Grozema, F.C. (author), Aernouts, Tom (author)Research into 2D layered hybrid perovskites is on the rise due to the enhanced stability of these materials compared to 3D hybrid perovskites. Recently, interest towards the use of functional organic cations for these materials is increasing. However, a vast amount of the parameter space remains unexplored in multi-layered (n > 1) hybrid...journal article 2018
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Hutter, E.M. (author), Gelvez Rueda, M.C. (author), Bartesaghi, D. (author), Grozema, F.C. (author), Savenije, T.J. (author)Recently, halide double perovskites (HDPs), such as Cs<sub>2</sub>AgBiBr<sub>6</sub>, have been reported as promising nontoxic alternatives to lead halide perovskites. However, it remains unclear whether the charge-transport properties of these materials are as favorable as for lead-based perovskites. In this work, we study the mobilities of...journal article 2018
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Gelvez Rueda, M.C. (author), Hutter, E.M. (author), Cao, Duyen H. (author), Renaud, N. (author), Stoumpos, Constantinos C. (author), Hupp, Joseph T. (author), Savenije, T.J. (author), Kanatzidis, Mercouri G. (author), Grozema, F.C. (author)The optoelectronic properties of hybrid perovskites can be easily tailored by varying their components. Specifically, mixing the common short organic cation (methylammonium (MA)) with a larger one (e.g., butyl ammonium (BA)) results in 2-dimensional perovskites with varying thicknesses of inorganic layers separated by the large organic cation...journal article 2017
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Gelvez Rueda, M.C. (author), Renaud, N. (author), Grozema, F.C. (author)The fundamental opto-electronic properties of organic-inorganic hybrid perovskites are strongly affected by their structural parameters. These parameters are particularly critical in formamidinium lead iodide (FAPbI<sub>3</sub>), in which its large structural disorder leads to a non-perovskite yellow phase that hinders its photovoltaic...journal article 2017
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Jiménez-Monroy, Kathia L. (author), Renaud, N. (author), Drijkoningen, Jeroen (author), Cortens, David (author), Schouteden, Koen (author), Van Haesendonck, Christian (author), Guedens, Wanda J. (author), Manca, Jean V. (author), Siebbeles, L.D.A. (author), Grozema, F.C. (author), Wagner, Patrick H. (author)Determining the mechanism of charge transport through native DNA remains a challenge as different factors such as measuring conditions, molecule conformations, and choice of technique can significantly affect the final results. In this contribution, we have used a new approach to measure current flowing through isolated double-stranded DNA...journal article 2017