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Svagan, Anna J. (author), Vilaplana, Francisco (author), Pettersson, Torbjörn (author), Ravi Anusuyadevi, P. (author), Henriksson, Gunnar (author), Hedenqvist, Mikael (author)The inherent colloidal dispersity (due to length, aspect ratio, surface charge heterogeneity) of CNCs, when produced using the typical traditional sulfuric acid hydrolysis route, presents a great challenge when interpreting colloidal properties and linking the CNC film nanostructure to the helicoidal self-assembly mechanism during drying....journal article 2024
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- Mulder, J.T. (author) doctoral thesis 2023
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du Fossé, I. (author)Due to their size-dependent properties, high photoluminescence quantum yield and relatively cheap solution-based processing, colloidal quantum dots (QDs) are of great interest for application in optoelectronic devices. However, the efficiency of these devices is often limited by the presence of trap states: localized electronic states that lead...doctoral thesis 2023
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Mulder, J.T. (author), Jenkinson, Kellie (author), Toso, Stefano (author), Prato, Mirko (author), Evers, W.H. (author), Bals, Sara (author), Manna, Liberato (author), Houtepen, A.J. (author)Lanthanide-doped LiYF4 (Ln:YLF) is commonly used for a broad variety of optical applications, such as lasing, photon upconversion and optical refrigeration. When synthesized as nanocrystals (NCs), this material is also of interest for biological applications and fundamental physical studies. Until now, it was unclear how Ln:YLF NCs grow from...journal article 2023
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Mulder, J.T. (author), Meijer, M.S. (author), van Blaaderen, J.J. (author), du Fossé, I. (author), Jenkinson, Kellie (author), Bals, Sara (author), Manna, Liberato (author), Houtepen, A.J. (author)Ytterbium-doped LiYF4 (Yb:YLF) is a commonly used material for laser applications, as a photon upconversion medium, and for optical refrigeration. As nanocrystals (NCs), the material is also of interest for biological and physical applications. Unfortunately, as with most phosphors, with the reduction in size comes a large reduction of the...journal article 2023
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Tang, Yingying (author), Poonia, D. (author), van der Laan, M. (author), Timmerman, Dolf (author), Kinge, S.S. (author), Siebbeles, L.D.A. (author), Schall, Peter (author)Assembled perovskite nanocrystals (NCs), known as supercrystals (SCs), can have many exotic optical and electronic properties different from the individual NCs due to energy transfer and electronic coupling in the dense superstructures. We investigate the optical properties and ultrafast carrier dynamics of highly ordered SCs and the...journal article 2021
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Fazel, M. (author), Salimijazi, Hamid R. (author), Shamanian, Morteza (author), Minneboo, M.B. (author), Modaresifar, K. (author), van Hengel, I.A.J. (author), Fratila-Apachitei, E.L. (author), Apachitei, I. (author), Zadpoor, A.A. (author)The recently developed additively manufacturing techniques have enabled the fabrication of porous biomaterials that mimic the characteristics of the native bone, thereby avoiding stress shielding and facilitating bony ingrowth. However, aseptic loosening and bacterial infection, as the leading causes of implant failure, need to be further...journal article 2021
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Pereira Espíndola, S. (author), Pronk, M. (author), Zlopasa, J. (author), Picken, S.J. (author), van Loosdrecht, Mark C.M. (author)Wastewater solids could be an attractive source of secondary raw cellulose, mainly originating from toilet paper. Cellulose can be recovered through sieving of raw wastewater, return sludge, or excess sludge. In particular, a large fraction of cellulose (13–15%) can be found in the excess sludge of the aerobic granular sludge produced by the...journal article 2021
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van der Laan, M. (author), De Weerd, Chris (author), Poirier, Lucas (author), van de Water, O.P. (author), Poonia, D. (author), Gomez, Leyre (author), Kinge, S.S. (author), Siebbeles, L.D.A. (author), Koenderink, A. Femius (author)Photon recycling, the iterative process of re-Absorption and re-emission of photons in an absorbing medium, can play an important role in the power-conversion efficiency of photovoltaic cells. To date, several studies have proposed that this process may occur in bulk or thin films of inorganic lead-halide perovskites, but conclusive proof of...journal article 2021
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Mulder, J.T. (author), du Fossé, I. (author), Alimoradi Jazi, M. (author), Manna, L. (author), Houtepen, A.J. (author)Lead halide perovskite nanocrystals have drawn attention as active light-absorbing or -emitting materials for opto-electronic applications due to their facile synthesis, intrinsic defect tolerance, and color-pure emission ranging over the entire visible spectrum. To optimize their application in, e.g., solar cells and light-emitting diodes, it...journal article 2021
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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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Ganesan, Abiseka (author)Quantum dots (QDs) are nano-crystal semiconductors (1-100 nm) in which charge carriers (electrons and holes) are confined in all 3 dimensions by potential barriers that cause them to behave differently from conventional bulk semiconductors. QD research in the past decade has progressed rapidly, allowing<br/>a deeper understanding of the physics...master thesis 2018
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Ganesan, Abiseka Akash (author), Houtepen, A.J. (author), Crisp, R.W. (author)From a niche field over 30 years ago, quantum dots (QDs) have developed into viable materials for many commercial optoelectronic devices. We discuss the advancements in Pb-based QD solar cells (QDSCs) from a viewpoint of the pathways an excited state can take when relaxing back to the ground state. Systematically understanding the fundamental...review 2018
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Kulkarni, A. (author), Evers, W.H. (author), Tomić, Stanko (author), Beard, Matthew C. (author), Vanmaekelbergh, Daniel (author), Siebbeles, L.D.A. (author)Carrier multiplication (CM) is a process in which a single photon excites two or more electrons. CM is of interest to enhance the efficiency of a solar cell. Until now, CM in thin films and solar cells of semiconductor nanocrystals (NCs) has been found at photon energies well above the minimum required energy of twice the band gap. The high...journal article 2018
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Kulkarni, A. (author), Siebbeles, L.D.A. (author)We studied charge carrier photogeneration, cooling, carrier multiplication (CM) and charge mobility and decay in: a) isolated PbSe nanocrystals in solution, b) films of PbSe nanocrystals coupled by organic ligands, and c) 2D percolative networks of epitaxially connected PbSe nanocrystals. The studies were performed using ultrafast pump-probe...conference paper 2018
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van der Stam, W. (author), de Graaf, M. (author), Gudjónsdóttir, S. (author), Geuchies, J.J. (author), Dijkema, J.J. (author), Kirkwood, N.R.M. (author), Evers, W.H. (author), Longo, Alessandro (author), Houtepen, A.J. (author)The processes that govern radiative recombination in ternary CuInS<sub>2</sub> (CIS) nanocrystals (NCs) have been heavily debated, but recently, several research groups have come to the same conclusion that a photoexcited electron recombines with a localized hole on a Cu-related trap state. Furthermore, it has been observed that single CIS...journal article 2018
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Crisp, R.W. (author), Kirkwood, N.R.M. (author), Grimaldi, G. (author), Kinge, Sachin (author), Siebbeles, L.D.A. (author), Houtepen, A.J. (author)InP and InZnP colloidal quantum dots (QDs) are promising materials for application in light-emitting devices, transistors, photovoltaics, and photocatalytic cells. In addition to possessing an appropriate bandgap, high absorption coefficient, and high bulk carrier mobilities, the intrinsic toxicity of InP and InZnP is much lower than for...journal article 2018
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Spoor, F.C.M. (author), Tomić, Stanko (author), Houtepen, A.J. (author), Siebbeles, L.D.A. (author)Understanding cooling of hot charge carriers in semiconductor quantum dots (QDs) is of fundamental interest and useful to enhance the performance of QDs in photovoltaics. We study electron and hole cooling dynamics in PbSe QDs up to high energies where carrier multiplication occurs. We characterize distinct cooling steps of hot electrons and...journal article 2017
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van Sebille, M. (author), Allebrandi, J.S. (author), Quik, J. (author), van Swaaij, R.A.C.M.M. (author), Tichelaar, F.D. (author), Zeman, M. (author)We demonstrate an analytical method to optimize the stoichiometry and thickness of multilayer silicon oxide films in order to achieve the highest density of non-touching and closely spaced silicon nanocrystals after annealing. The probability of a nanocrystal nearest-neighbor distance within a limited range is calculated using the...journal article 2016
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Quik, J. (author)Silicon nanoparticles (NPs) embedded in a dielectric matrix, such as silicon oxide, pose a promising candidate for all-silicon multi-junction solar cells. This material is often analysed with photoluminescence (PL) measurements. In literature, the intensities of different PL measurements are either directly compared or normalized. Normalization...master thesis 2016
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