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Zhang, F. (author), Wu, Z. (author), Wang, Jianlin (author), Wu, Zhenduo (author), Zhao, C. (author), Eijt, S.W.H. (author), Schut, H. (author), van Dijk, N.H. (author), Brück, E.H. (author)Recently, the all-d-metal Ni(Co)MnTi based Heusler compounds are found to have a giant magnetocaloric effect (GMCE) near room temperature and manifest different functionalities like multicaloric effects, which can be employed for solid-state refrigeration. However, in comparison to other traditional Heusler compounds, the relatively large...journal article 2024
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Wu, Z. (author), De Wit, Lidwin (author), Beek, Melanie (author), Colombi, G. (author), Chaykina, D. (author), Schreuders, H. (author), Schut, H. (author), Butterling, Maik (author), Brück, E.H. (author), Dam, B. (author), Eijt, S.W.H. (author)Cycling stability of the photochromic effect in rare-earth oxyhydride thin films is of great importance for long-term applications such as smart windows. However, an increasingly slower bleaching rate upon photochromic cycling was found in yttrium oxyhydride thin films; the origin of this memory effect is yet unclear. In this work, the...journal article 2024
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Wu, Z. (author), De Krom, Tom (author), Colombi, G. (author), Chaykina, D. (author), Van Hattem, Gijs (author), Schut, H. (author), Dickmann, Marcel (author), Brück, E.H. (author), Dam, B. (author), Eijt, S.W.H. (author)Rare-earth (RE) oxyhydride thin films show a color-neutral, reversible photochromic effect at ambient conditions. The origin of the photochromism is the topic of current investigations. Here, we investigated the lattice defects, electronic structure, and crystal structure of photochromic YHxOy and GdHxOy thin films deposited by magnetron...journal article 2022
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van Amelrooy, E.F. (author), Schut, H. (author), Egger, Werner (author), Dickmann, Marcel (author), Hugenschmidt, Christoph (author), Mallée, L. (author), Hanefeld, U. (author), McMillan, D.G.G. (author), Eijt, S.W.H. (author)A new method is developed to produce mesoporous titania thin films at room temperature using the enzyme papain in a dip-coating procedure, providing low-cost titania films in a sustainable manner. Quartz crystal microbalance, positron annihilation Doppler broadening and lifetime spectroscopy, scanning electron microscopy, and X-ray...journal article 2020
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Bento Montes, A.R. (author), Eijt, S.W.H. (author), Tian, Y. (author), Gram, R. (author), Schut, H. (author), Suemasu, T. (author), Usami, N. (author), Zeman, M. (author), Serra, J. (author), Isabella, O. (author)Barium di-silicide (BaSi<sub>2</sub>) is a very promising absorber material for high-efficiency thin-film solar cells, due to its suitable bandgap, high light absorption coefficient, and long minority-carrier lifetime. In this study, we compare the nanostructure, layer composition, and point defects of BaSi<sub>2</sub> thin films deposited by...journal article 2020
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Eijt, S.W.H. (author), De Krom, T. W.H. (author), Chaykina, D. (author), Schut, H. (author), Colombi, G. (author), Cornelius, S. (author), Egger, W. (author), Dickmann, M. (author), Dam, B. (author)Doppler broadening positron annihilation spectroscopy depth profiles were collected on photochromic YO<sub>x</sub>H<sub>y</sub> thin films. In situ UV illumination of photochromic semiconductor YO<sub>x</sub>H<sub>y</sub> films leads to an increase in S-parameter and a large reduction in W-parameter, possibly caused by a change in the charge...journal article 2020
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Han, C. (author), Yang, G. (author), Montes, Ana (author), Procel Moya, P.A. (author), Mazzarella, L. (author), Zhao, Y. (author), Eijt, S.W.H. (author), Schut, H. (author), Zhang, Xiaodan (author), Zeman, M. (author), Isabella, O. (author)In high-efficiency silicon solar cells featuring carrier-selective passivating contacts based on ultrathin SiOx/poly-Si, the appropriate implementation of transparent conductive oxide (TCO) layers is of vital importance. Considerable deterioration in passivation quality occurs for thin poly-Si-based devices owing to the sputtering damage...journal article 2020
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Shi, W. (author), Theelen, Mirjam (author), Illiberi, Andrea (author), van der Sar, S.J. (author), Butterling, M. (author), Schut, H. (author), Zeman, M. (author), Brück, E.H. (author), Eijt, S.W.H. (author)Positron annihilation lifetime spectroscopy (PALS) and Doppler broadening positron annihilation spectroscopy (DB-PAS) depth profiling demonstrate pronounced growth of vacancy clusters at the grain boundaries of as-deposited Al-doped ZnO films deposited as transparent conductive oxide (TCO) on Cu(In,Ga)Se2 (CIGS) solar cells upon accelerated...journal article 2018
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Plokker, M.P. (author), Eijt, S.W.H. (author), Naziris, F. (author), Schut, H. (author), Nafezarefi, F. (author), Schreuders, H. (author), Cornelius, S. (author), Dam, B. (author)In order to investigate the mechanism of the photochromic effect in yttrium oxy-hydride (YO<sub>x</sub>H<sub>y</sub>) thin films, Doppler broadening positron annihilation spectroscopy (PAS) was applied to probe the electronic structure and the presence of vacancies in YO<sub>x</sub>H<sub>y</sub> and related materials as a function of...journal article 2018
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Shi, W. (author), Theelen, Mirjam (author), Illiberi, Andrea (author), van der Sar, S.J. (author), Butterling, M. (author), Schut, H. (author), Zeman, M. (author), Brück, E.H. (author), Eijt, S.W.H. (author)Positron annihilation lifetime spectroscopy (PALS) and Doppler broadening positron annihilation spectroscopy DB-PAS) depth profiling demonstrate pronounced growth of vacancy clusters at the grain boundaries of as-deposited Al-doped ZnO films deposited as transparent conductive oxide (TCO) on Cu(In, Ga)Se2 (CIGS) solar cells upon accelerated...journal article 2018
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Melskens, J. (author), Eijt, S.W.H. (author), Schouten, M. (author), Vullers, A.S. (author), Mannheim, Awital (author), Schut, H. (author), Macco, Bart (author), Zeman, M. (author), Smets, A.H.M. (author)The nanostructure of hydrogenated amorphous silicon (a-Si:H) is studied by means of doppler broadening positron annihilation spectroscopy (DB-PAS) and Fourier transform infrared (FTIR) spectroscopy. The evolution of open volume deficiencies is monitored during annealing, demonstrating that small vacancies and other small vacancy clusters that...journal article 2017
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Eijt, S.W.H. (author), Shi, W. (author), Mannheim, A. (author), Butterling, M. (author), Schut, H. (author), Egger, W (author), Dickmann, M. (author), Hugenschmidt, C (author), Shakeri, B. (author), Meulenberg, R.W. (author), Callewaert, V. (author), Saniz, R (author), Partoens, B (author), Barbiellini, B (author), Bansil, A (author), Melskens, J. (author), Zeman, M. (author), Smets, A.H.M. (author), Kulbak, M. (author), Hodes, G. (author), Cahen, D. (author), Brück, E.H. (author)Recent studies showed that positron annihilation methods can provide key insights into the nanostructure and electronic structure of thin film solar cells. In this study, positron annihilation lifetime spectroscopy (PALS) is applied to investigate CdSe quantum dot (QD) light absorbing layers, providing evidence of positron trapping at the...journal article 2017
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Melskens, J. (author), Schnegg, A. (author), Baldansuren, A. (author), Lips, K. (author), Plokker, M.P. (author), Eijt, S.W.H. (author), Schut, H. (author), Fischer, M. (author), Zeman, M. (author), Smets, A.H.M. (author)The structural and electrical properties of metastable defects in various types of hydrogenated amorphous silicon have been studied using a powerful combination of continuous wave electron-paramagnetic resonance spectroscopy, electron spin echo (ESE) decay measurements, and Doppler broadening positron annihilation spectroscopy. The observed...journal article 2015
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Scorticati, D. (author), Illiberi, A. (author), Bor, T. (author), Eijt, S.W.H. (author), Schut, H. (author), Römer, G.R.B.E. (author), De Lange, D.F. (author), Huis in 't Veld, A.J. (author)Post-deposition annealing by ultra-short laser pulses can modify the optical properties of SnO2 thin films by means of thermal processing. Industrial grade SnO2 films exhibited improved optical properties after picosecond laser irradiation, at the expense of a slightly increased sheet resistance [Proc. SPIE 8826, 88260I (2013)]. The figure of...journal article 2014
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Chai, L. (author), Al-Sawai, W. (author), Gao, Y. (author), Houtepen, A.J. (author), Mijnarends, P.E. (author), Barbiellini, B. (author), Schut, H. (author), Van Schaarenburg, L.C. (author), Van Huis, M.A. (author), Ravelli, L. (author), Egger, W. (author), Kaprzyk, S. (author), Bansil, A. (author), Eijt, S.W.H. (author)Positron annihilation lifetime spectroscopy and positron-electron momentum density (PEMD) studies on multilayers of PbSe nanocrystals (NCs), supported by transmission electron microscopy, show that positrons are strongly trapped at NC surfaces, where they provide insight into the surface composition and electronic structure of PbSe NCs. Our...journal article 2013
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Anastasopol, A. (author), Eijt, S.W.H. (author), Schut, H. (author), Mulder, F.M. (author), Plazaola, F. (author), Dam, B. (author)Mg-Ti compounds are attractive candidates as hydrogen storage materials for their fast sorption kinetics and high storage capacity. In this context, an investigation of their thermal stability is of great importance. The thermal stability of MgyTi1-y thin films was investigated using positron annihilation spectroscopy. Despite the positive...journal article 2012
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Al-Sawai, W. (author), Barbiellini, B. (author), Sakurai, Y. (author), Itou, M. (author), Mijnarends, P.E. (author), Markiewicz, R.S. (author), Kaprzyk, S. (author), Wakimoto, S. (author), Fujita, M. (author), Basak, S. (author), Lin, H. (author), Wang, Y.J. (author), Eijt, S.W.H. (author), Schut, H. (author), Yamada, K. (author), Bansil, A. (author)We have observed the bulk Fermi surface (FS) in an overdoped (x=0.3) single crystal of La2?xSrxCuO4 by using Compton scattering. A two-dimensional (2D) momentum density reconstruction from measured Compton profiles yields a clear FS signature in the third Brillouin zone along [100]. The quantitative agreement between density functional theory ...journal article 2012
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Leegwater, H. (author), Schut, H. (author), Egger, W. (author), Baldi, A. (author), Dam, B. (author), Eijt, S.W.H. (author)We obtained evidence for the partial chemical segregation of as-deposited and hydrogenated Mg1?yTiy films (0 ? y ? 0.30) into nanoscale Ti and Mg domains using positron Doppler-broadening. We exclusively monitor the hydrogenation of Mg domains, owing to the large difference in positron affinity for Mg and Ti. The electron momentum distribution...journal article 2010
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Eijt, S.W.H. (author), Kind, R. (author), Singh, S. (author), Schut, H. (author), Legerstee, W.J. (author), Hendrikx, R.W.A. (author), Svetchnikov, V.L. (author), Westerwaal, R.J. (author), Dam, B. (author)We report positron depth-profiling studies on the hydrogen sorption behavior and phase evolution of Mg-based thin films. We show that the main changes in the depth profiles resulting from the hydrogenation to the respective metal hydrides are related to a clear broadening in the observed electron momentum densities in both Mg and Mg2Ni films....journal article 2009
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Eijt, S.W.H. (author), De Roode, J. (author), Schut, H. (author), Kooi, B.J. (author), De Hosson, J.T.M. (author)Coimplantation of Zn and O ions into a single crystalline MgO and subsequent thermal annealing were applied in the synthesis of ZnO nanocrystals. Electron microscopy showed that rocksalt instead of wurtzite ZnO stabilizes for relatively large nanocrystals up to ~15?nm, resulting from its small lattice mismatch with MgO of ~1.7%. The vacancies...journal article 2007
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