Searched for: subject%3A%22excitons%22
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Gillespie, Sarah C. (author), van der Laan, Marco (author), Poonia, D. (author), Maiti, Sourav (author), Kinge, S.S. (author), Siebbeles, L.D.A. (author), Schall, Peter (author)
Heterostructures (HSs) based on two-dimensional transition metal dichalcogenides (TMDCs) are highly intriguing materials because of the layers’ pronounced excitonic properties and their nontrivial contributions to the HS. These HSs exhibit unique properties that are not observed in either of the constituent components in isolation. Interlayer...
review 2024
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Carmiggelt, J.J. (author)
Knowledge about the magnetic and electronic properties of materials does not only expand our fundamental understanding of nature, but is also crucial for the development of new technologies. Today’s electronic devices rely on electrical currents to transport and process information, which generate a lot of heat waste via Joule heating. These...
doctoral thesis 2023
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Klein, Julian (author), Pingault, B.J. (author), Florian, Matthias (author), Heißenbüttel, Marie Christin (author), Steinhoff, Alexander (author), Song, Zhigang (author), Torres, Kierstin (author), Dirnberger, Florian (author), Curtis, Jonathan B. (author)
Correlated quantum phenomena in one-dimensional (1D) systems that exhibit competing electronic and magnetic order are of strong interest for the study of fundamental interactions and excitations, such as Tomonaga-Luttinger liquids and topological orders and defects with properties completely different from the quasiparticles expected in their...
journal article 2023
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van der Lippe, Stijn (author), Brokkelkamp, A.R. (author), Rojo, Juan (author), Conesa Boj, S. (author)
This study presents an in-depth investigation of the electronic properties and bandgap energy distribution in 1D molybdenum disulfide (1D-MoS<sub>2</sub>) nanostructures. Through a combination of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and electron energy-loss spectroscopy (EELS), it reveals...
journal article 2023
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van der Laan, M. (author), Heemskerk, Edwin (author), Kienhuis, Floris (author), Poonia, D. (author), Kinge, S.S. (author), Dang, Minh Triet (author), Dinh, Van An (author), Siebbeles, L.D.A. (author), Isaeva, Anna (author), Schall, Peter (author)
Rhenium disulfide, a member of the transition metal dichalcogenide family of semiconducting materials, is unique among 2D van der Waals materials due to its anisotropy and, albeit weak, interlayer interactions, confining excitons within single atomic layers and leading to monolayer-like excitonic properties even in bulk crystals. While recent...
journal article 2023
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Yao, Huanhuan (author), Li, Zhizai (author), Shi, Chang (author), Xu, Youkui (author), Wang, Qian (author), Li, Zhen Hua (author), Peng, Guoqiang (author), Lei, Yutian (author), Wang, H. (author)
Two-dimensional (2D) Ruddlesden–Popper (RP) CsPbI<sub>3</sub> perovskite possesses superior phase stability by introducing steric hindrance. However, due to the quantum and dielectric confinement effect, 2D structures usually exhibit large exciton binding energy, and the charge tunneling barrier across the organic interlayer is difficult to...
journal article 2022
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Caselli, V.M. (author), Thieme, J. (author), Jöbsis, Huygen J. (author), Phadke, S.A. (author), Zhao, J. (author), Hutter, Eline M. (author), Savenije, T.J. (author)
Suitable optoelectronic properties of lead halide perovskites make these materials interesting semiconductors for many applications. Toxic lead can be substituted by combining monovalent and trivalent cations, such as in Cs<sub>2</sub>AgBiBr<sub>6</sub>. However, efficiencies of Cs<sub>2</sub>AgBiBr<sub>6</sub>-based photovoltaics are still...
journal article 2022
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Hernandez Rueda, F.J. (author), Noordam, M.L. (author), Komen, I. (author), Kuipers, L. (author)
Currently, the nonlinear optical properties of 2D materials are attracting the attention of an ever-increasing number of research groups due to their large potential for applications in a broad range of scientific disciplines. Here, we investigate the interplay between nonlinear photoluminescence (PL) and several degenerate and nondegenerate...
journal article 2021
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Khanin, V. (author), Venevtsev, Ivan (author), Chernenko, Kirill (author), Pankratov, Vladimir (author), Klementiev, Konstantin (author), van Swieten, Thomas (author), van Bunningen, Arnoldus J. (author), Vrubel, Ivan (author), Shendrik, Roman (author)
Scintillators based on Ce-doped garnets are regularly co-doped with Mg<sup>2+</sup> or Ca<sup>2+</sup> to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce<sup>4+</sup> concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce<sup>3+</sup...
journal article 2021
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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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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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Milichko, Valentin A. (author), Khramenkova, E. (author), Dzyuba, Vladimir P. (author), Pidko, E.A. (author)
This is a response to a comment on the interpretation of the origin of the nonlinear changes of optical properties of van der Waals' metal–organic frameworks (MOFs). The concerns are addressed by clarifying potential pitfalls in density functional theory (DFT) simulations, careful analysis of prior literature, and additionally discussing the...
journal article 2017
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Fravventura, M.C. (author)
This research focuses on the investigation of the opto-electronic properties of a variety of organic and inorganic materials of interest for photovoltaics. Fundamental knowledge on the parameters that play an important role in the process of charge photogeneration is achieved by application of a number of experimental methods, the most relevant...
doctoral thesis 2014
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Louwers, D.J. (author), Takizawa, T. (author), Hidaka, C. (author), Van der Kolk, E. (author)
A Eu2+ concentration and temperature dependent energy transfer study from the host lattice to Eu2+ luminescence centers in Ca(1–x)EuxGa2S4 (x = 0.001 to 0.05) was performed with a special streak camera that combines the high timing resolution of a conventional synchroscan operation (<2 ps) with the ability to study long lived states (10?ns???1...
journal article 2012
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Bulgarini, G. (author), Reimer, M.E. (author), Zehender, T. (author), Hocevar, M. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author), Zwiller, V. (author)
Nanowire waveguides with controlled shape are promising for engineering the collection efficiency of quantum light sources. We investigate the exciton lifetime in individual InAsP quantum dots, perfectly positioned on-axis of InP nanowire waveguides. We demonstrate control over the quantum dot spontaneous emission by varying the nanowire...
journal article 2012
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Patwardhan, S. (author)
The field of organic electronics has been thriving for the last decades due to growing commercial interest. One of the advantages of using organic materials as semiconductors is the possibility to tune their optoelectronic properties by modifying the chemical structure and organization of the building blocks. In this thesis, the properties of...
doctoral thesis 2011
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Schins, J.M. (author)
The retrieval of the primary (subpicosecond) photoproducts in small-band two-dimensional time-domain terahertz spectroscopy has succeeded only in a few model systems, due to the complicated correlation between the two time parameters. We show that the nature of the primary photoproducts is revealed upon differentiating the measured time-domain...
journal article 2010
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Dorenbos, S.N. (author), Sasakura, H. (author), Van Kouwen, M.P. (author), Akopian, N. (author), Adachi, S. (author), Namekata, N. (author), Jo, M. (author), Motohisa, J. (author), Kobayashi, Y. (author), Tomioka, K. (author), Fukui, T. (author), Inoue, S. (author), Kumano, H. (author), Natarajan, C.M. (author), Hadfield, R.H. (author), Zijlstra, T. (author), Klapwijk, T.M. (author), Zwiller, V. (author), Suemune, I. (author)
We report the experimental demonstration of single-photon and cascaded photon pair emission in the infrared, originating from a single InAsP quantum dot embedded in a standing InP nanowire. A regular array of nanowires is fabricated by epitaxial growth on an electron-beam patterned substrate. Photoluminescence spectra taken on single quantum...
journal article 2010
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Van Weert, M.H.M. (author), Den Heijer, M. (author), Van Kouwen, M.P. (author), Algra, R.E. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, L.P. (author), Zwiller, V. (author)
We report voltage dependent photoluminescence experiments on single indium arsenide phosphide (InAsP) quantum dots embedded in vertical surround-gated indium phosphide (InP) nanowires. We show that by tuning the gate voltage, we can access different quantum dot charge states. We study the anisotropic exchange splitting by polarization analysis,...
journal article 2010
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Perinetti, U. (author), Akopian, N. (author), Samsonenko, Y.B. (author), Bouravleuv, A.D. (author), Cirlin, G.E. (author), Zwiller, V. (author)
We report on optical studies of single InAs quantum dots grown on vicinal GaAs(001) surfaces. To ensure low quantum dot density and appropriate size, we deposit InAs layers 1.4 or 1.5 ML thick, thinner than the critical thickness for Stranski–Krastanov quantum dot formation. These dots show sharp and bright photoluminescence. Lifetime...
journal article 2009
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