Article
Chemistry, Physical
Baicheng Mei, Bilin Zhuang, Yuyuan Lu, Lijia An, Zhen-Gang Wang
Summary: By introducing the concept of local-average free volume, this study reveals the correlation between dynamic heterogeneity and the average local free volume in glass formers, resolving the controversy regarding the role of free volume in particle rearrangements.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Ceramics
Salman Ali Khan, Tauseef Ahmed, Jihee Bae, Soo Yong Choi, Mingyu Kim, Rizwan Ahmed Malik, Tae-Kwon Song, Myong-Ho Kim, Soonil Lee
Summary: By adding BNSTNZ modification, the dielectric permittivity of BFBT-BNSTNZ ceramics can be suppressed and the temperature stability range can be expanded. In particular, at x = 0.10, it has the widest stability temperature range and high dielectric permittivity with low dielectric loss.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Polymer Science
Ali Mansuri, Milan Volkel, Tim Feuerbach, Judith Winck, Arnoldus W. P. Vermeer, Werner Hoheisel, Markus Thommes
Summary: This study modifies the free volume theory to improve its predictive capability for diffusion of small molecules in amorphous polymers. It is applied to the diffusion of three active ingredients in polyvinylpyrrolidone and shows good agreement with experimental data. The modified free volume theory provides a fully predictive platform for describing diffusion in polymers with an extended temperature and compositional applicability range compared to the original version.
Article
Nanoscience & Nanotechnology
David Gracia, Sara Lafuerza, Javier Blasco, Marco Evangelisti
Summary: This study investigates the dielectric and electrocaloric properties of Ba1-yCayTi1-xHfxO3. The addition of Hf/Ca alters the temperature and width of the ferroelectric-paraelectric phase transition. The electrocaloric effect is enhanced with increasing Hf/Ca substitutions, but the electrocaloric responsivity gradually decreases.
Article
Materials Science, Multidisciplinary
M. Molina-Ruiz, H. C. Jacks, D. R. Queen, T. H. Metcalf, X. Liu, F. Hellman
Summary: Specific heat measurements of hydrogenated amorphous silicon prepared by hot-wire chemical vapor deposition reveal a large density of two-level systems at low temperature. Annealing at 200 degrees C irreversibly reduces the non-Debye specific heat by an order of magnitude at 2 K, indicating a significant reduction in the density of two-level systems. The presence of hydrogen is suggested to anomalously lower the coupling constant value.
Article
Chemistry, Physical
Jiri Malek
Summary: This article discusses the structural relaxation phenomenon in amorphous materials using the TNM, KAHR, and AGSH models. These three phenomenological models are commonly used to describe experimental structural relaxation data through curve fitting. Parameters reported in the literature for 250 different amorphous material compositions are analyzed based on the isothermal relaxation rate R, the nonexponentiality parameter fi, and the nonlinearity contribution a = -(dln z/dTf)i. The R10 calculated at 10 K below Tg represents a scale for the structural relaxation rate, providing valuable insights into the kinetics of structural relaxation in various amorphous materials and their potential applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
Tongtong Fu, Jin Qian, Shufeng Xie, Changshuai Liu, Bo Shen, Jiwei Zhai
Summary: Glass-ceramics have great potential in sustainable development, environmental protection, high temperature, and high voltage resistance. Alkali-free niobate-based glass-ceramics have emerged as prominent energy storage materials. This study optimized the thickness and crystallization temperature of alkali-free glass-ceramics to improve breakdown strength and achieve maximum dielectric constant. An ultra-high theoretical energy storage density of 27.47 J/cm^3 was obtained. Finite element software simulated the electric field distribution and electric potential evolution, demonstrating the role of glass phase in hindering electric branch development. The effective energy storage density obtained through P-E loops was 1.49 J/cm^3 under 850 kV/cm.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
P. La Torraca, F. Caruso, A. Padovani, G. Tallarida, S. Spiga, L. Larcher
Summary: We present a comprehensive characterization of amorphous alumina in MIM stacks, extracting the distribution of atomic defects and bond-breaking process parameters. The active defects were profiled through various simulations, and the extracted defect energies were consistent with oxygen vacancies and aluminum interstitials. The breakdown statistics of voltage-dependent dielectric breakdown were investigated, showing complex and polarity-dependent breakdown patterns correlating with defect distributions.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Materials Science, Ceramics
Ping Peng, Hengchang Nie, Chan Zheng, Genshui Wang, Xianlin Dong
Summary: A new ternary ceramic was designed to improve energy storage properties, with significant enhancements in recoverable energy storage density, responsivity, and power density particularly at x = 0.14 composition. This indicates promising potential for energy storage applications.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
T. Odagaki, Y. Saruyama, T. Ishida
Summary: The free energy landscape is reorganized with temperature modulation, impacting the relaxation process and physical properties. The relaxation time of dielectric response depends on the relaxation of the FEL, converging to equilibrium in the long term. In temperature modulation spectroscopy, the dynamics are influenced by the relaxation time of FEL.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
Piyush Sapkota, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada
Summary: The study investigated the effects of one-step and two-step calcination methods on the crystal structure, microstructure, and electrical properties of BaTi1-2xMnxNbxO3 ceramics. It was found that ceramics calcined using the two-step method had lower dielectric loss and higher dielectric constants at high temperatures, making them potential candidates for temperature stable, DC-bias free capacitor applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Thomas Brown, Andy P. Brown, David A. Hall, Thomas E. Hooper, Yizhe Li, Stuart Micklethwaite, Zabeada Aslam, Steven J. Milne
Summary: The study presents ceramics with high relative permittivity over a wide temperature range, designed for base metal electrode multilayer capacitor manufacturing processes. A potential Class II capacitor material free from Bi or Pb ions has been developed by doping Sr2NaNb5O15 with Ca2+, Y3+, and Zr4+ ions. The materials exhibit stable dielectric properties at high temperatures.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Victor Malgras, Yoshitaka Matsushita, Joel Henzie, Yoshiyuki Sugahara, Yusuke Yamauchi
Summary: This study demonstrates a method for exfoliating thin films using alkaline treatment, and successfully redepositing the materials elsewhere. It also emphasizes the importance of preserving pore ordering and neutralizing the solution.
CHEMICAL COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
J. Meza Arroyo, M. G. Syamala Rao, M. S. de Urquijo Ventura, V. H. Martinez-Landeros, Trey B. B. Daunis, Ovidio Rodriguez, Julia W. P. Hsu, R. Ramirez Bon
Summary: In this study, HfAlOx-PVP hybrid thin films were prepared by incorporating hafnium derivatives into AlOx-PVP hybrid solution. The addition of hafnium improved the dielectric properties of the thin films and provided excellent electrical performance with low hysteresis in thin-film transistors. These hybrid materials show potential for future flexible electronic device applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
G. Hassnain Jaffari, Adeel Zafar, Wajid Ali, Guoliang Yuan
Summary: The high temperature electrical properties of morphotropic phase boundary BiScO3-PbTiO3 compositions, including high piezoelectric coefficient, saturation polarization, field induced strain, and low dielectric loss, were presented. The presence of various polymorphs with lower or higher symmetry configuration affecting a wider or narrower temperature regime was confirmed through dielectric data analysis. The conductivity effects associated with charge transport were found to be not dominant up to 600 K, indicating the material's potential for high temperature applications.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Layla N. Qasim, E. Berk Atuk, Andrii O. Maksymov, Janarthanan Jayawickramarajah, Alexander L. Burin, Igor V. Rubtsov
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Chemistry, Multidisciplinary
Saba Gharibzadeh, Ihteaz M. Hossain, Paul Fassl, Bahram Abdollahi Nejand, Tobias Abzieher, Moritz Schultes, Erik Ahlswede, Philip Jackson, Michael Powalla, Soren Schaefer, Michael Rienaecker, Tobias Wietler, Robby Peibst, Uli Lemmer, Bryce S. Richards, Ulrich W. Paetzold
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Instruments & Instrumentation
Andreas Reifenberger, Andreas Reiser, Sebastian Kempf, Andreas Fleischmann, Christian Enss
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Chemistry, Physical
Alexei Boulatov, Alexander L. Burin
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Jonas A. Schwenzer, Tim Hellmann, Bahram Abdollahi Nejand, Hang Hu, Tobias Abzieher, Fabian Schackmar, Ihteaz M. Hossain, Paul Fassl, Thomas Mayer, Wolfram Jaegermann, Uli Lemmer, Ulrich W. Paetzold
Summary: Through investigating the impact of different cation compositions on the thermal stability of perovskite thin films, it was found that methylammonium-based perovskite thin films exhibited more pronounced decomposition, while the stoichiometry in methylammonium-free formamidinium lead iodide (FAPbI(3)) and formamidinium cesium lead iodide (FACsPbI(3)) thin films was more stable, demonstrating remarkable stability with no decline in power conversion efficiency under thermal stress at 85 degrees C for 1000 h.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Ahmed Farag, Raphael Schmager, Paul Fassl, Philipp Noack, Bianca Wattenberg, Torsten Dippell, Ulrich W. Paetzold
Summary: Light management is crucial for high-performance solar cells, including monolithic perovskite/Si tandem solar cells. This study presents high-efficiency perovskite solar cells processed on industry-applicable random pyramidal textures. These textured solar cells demonstrate improved light management compared to planar cells, with reduced reflectance and enhanced light trapping. Furthermore, the textured cells maintain high fill factor and open-circuit voltage, and exhibit improved current generation for all angles of incidence, making them advantageous for realistic irradiation conditions and bifacial applications.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Marco A. Ruiz-Preciado, Fabrizio Gota, Paul Fassl, Ihteaz M. Hossain, Roja Singh, Felix Laufer, Fabian Schackmar, Thomas Feeney, Ahmed Farag, Isabel Allegro, Hang Hu, Saba Gharibzadeh, Bahram Abdollahi Nejand, Veronique S. Gevaerts, Marcel Simor, Pieter J. Bolt, Ulrich W. Paetzold
Summary: This study successfully fabricated high-efficiency perovskite/CIS tandem solar cells, showcasing the potential of monolithic two-terminal structure. By optimizing the techniques, a power conversion efficiency approaching 25% was achieved, setting the foundation for future improvements in efficiency.
ACS ENERGY LETTERS
(2022)
Article
Physics, Multidisciplinary
Ph Pfaefflein, S. Allgeier, S. Bernitt, A. Fleischmann, M. Friedrich, Ch Hahn, D. Hengstler, M. O. Herdrich, A. Kalinin, F. M. Kroeger, P. Kuntz, M. Lestinsky, B. Loeher, E. B. Menz, T. Over, U. Spillmann, G. Weber, B. Zhu, Ch Enss, Th Stoehlker
Summary: This study reports the integration of novel magnetic microcalorimeter detectors developed within SPARC into the experimental environment of storage rings at GSI, Darmstadt. The modifications made to the detector allow for precision x-ray spectroscopy of stored heavy ions.
Article
Energy & Fuels
Thomas Feeney, Ihteaz M. Hossain, Saba Gharibzadeh, Fabrizio Gota, Roja Singh, Paul Fassl, Adrian Mertens, Ahmed Farag, Jan-Philipp Becker, Stefan Paetel, Erik Ahlswede, Ulrich W. Paetzold
Summary: This article presents a method to improve the efficiency of 4T perovskite/CIGS tandem solar cells, achieving a PCE of 27.3% through systematic optimization of the top semi-transparent PSC. Improvements in light management through the optimization of anti-reflection coatings and the development of transparent conductive oxides that incur very low parasitic absorption are crucial for maximizing efficiency.
Article
Materials Science, Multidisciplinary
Abed Alrhman Eliwi, Mahdi Malekshahi Byranvand, Paul Fassl, Motiur Rahman Khan, Ihteaz Muhaimeen Hossain, Markus Frericks, Simon Ternes, Tobias Abzieher, Jonas A. Schwenzer, Thomas Mayer, Jan P. Hofmann, Bryce S. Richards, Uli Lemmer, Michael Saliba, Ulrich W. Paetzold
Summary: The use of a bilayer c(Li)-NP-SnO2 ETL can enhance electron extraction and charge transport properties for perovskite solar cells, reducing J-V hysteresis and improving stability PCE compared to single-layer or undoped bilayer ETLs.
MATERIALS ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Saba Gharibzadeh, Paul Fassl, Ihteaz M. Hossain, Pascal Rohrbeck, Markus Frericks, Moritz Schmidt, The Duong, Motiur Rahman Khan, Tobias Abzieher, Bahram Abdollahi Nejand, Fabian Schackmar, Osbel Almora, Thomas Feeney, Roja Singh, Dirk Fuchs, Uli Lemmer, Jan P. Hofmann, Stefan A. L. Weber, Ulrich W. Paetzold
Summary: This study successfully enhanced the efficiency and stability of inverted p-i-n structured perovskite solar cells using a dual passivation strategy, achieving high power conversion efficiency and good stability.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Paul Fassl, Vincent Lami, Felix J. Berger, Lukas M. Falk, Jana Zaumseil, Bryce S. Richards, Ian A. Howard, Yana Vaynzof, Ulrich W. Paetzold
Summary: The study establishes an analysis procedure to accurately determine the photon escape probability of perovskite films based on PL spectra, revealing higher (p) over bar (e) values than previously assumed. Applying the model to CH3NH3PbI3 films corrects previous estimates for internal luminescence quantum efficiency, showing more potential for reducing non-radiative recombination than initially thought.
Article
Materials Science, Multidisciplinary
Ofek Asban, Alexander Burin, Alexander Shnirman, Moshe Schechter
Summary: This study investigates the impact of a metal plate on the variable range hopping conductivity of a two-dimensional electron-glass system. It reveals both static and dynamic effects, with the former increasing conductivity at very low temperatures and the latter suppressing phonon-assisted hopping and conductivity over a wider temperature range than the static effect. The findings provide insights into the behavior of electron-glass systems with external influences.
Article
Chemistry, Physical
Somayeh Moghadamzadeh, Ihteaz M. Hossain, The Duong, Saba Gharibzadeh, Tobias Abzieher, Huyen Pham, Hang Hu, Paul Fassl, Uli Lemmer, Bahram Abdollahi Nejand, Ulrich W. Paetzold
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
Article
Materials Science, Multidisciplinary
Andrii O. Maksymov, Alexander L. Burin