Article
Chemistry, Physical
Ravinder Chahal, Abhilasha Bora, P. K. Giri
Summary: This study demonstrates the growth of highly crystalline and uniform Cs2AgBiBr6 thin films via chemical vapor deposition (CVD). The thin films exhibit high structural and compositional uniformity with excellent thermal stability and optoelectronic performance. The substrate-dependent growth aids in studying the induced lattice strain, while a detailed analysis of electron-phonon and phonon-phonon interactions was conducted in the Cs2AgBiBr6 double perovskite system. Additionally, the CVD-grown Cs2AgBiBr6 film on a SiO2 substrate showed fast photoresponse when used as a photodetector. The results provide insights for the development of high-performance optoelectronic devices based on lead-free inorganic double perovskites.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Huanxin Peng, Ping Fan, Zhuanghao Zheng, Shuo Chen, Guangxing Liang
Summary: Environmentally friendly lead-free Cs2AgBiBr6 double perovskites have been successfully synthesized using a single-source vapor deposition process with a thermally induced phase-controlled strategy. The resulting high-quality Cs2AgBiBr6 films exhibit high-phase purity, uniformity, smoothness, and desired composition stoichiometry. These films show promise for the development of high-performance photovoltaic devices.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
K. K. Meng, J. K. Chen, Y. Wu, X. G. Xu, T. Kikkawa, L. P. Sun, D. Z. Hou, Q. Li, N. N. Zhang, Z. G. Fu, T. Zhu, Y. Jiang, E. Saitoh
Summary: In this study, the quantum correction to the anomalous Hall effects (AHEs) in magnetic PtMnGe (PMG) thin films was investigated. It was found that the quantum correction to the transport behavior in the two-dimensional PMG system remains robust, even in the presence of spin-dependent scattering.
Article
Chemistry, Multidisciplinary
Zewei Li, Satyaprasad P. Senanayak, Linjie Dai, Gunnar Kusch, Ravichandran Shivanna, Youcheng Zhang, Dipika Pradhan, Junzhi Ye, Yi-Teng Huang, Henning Sirringhaus, Rachel A. Oliver, Neil C. Greenham, Richard H. Friend, Robert L. Z. Hoye
Summary: In the study, it was found that grain boundaries act as main nonradiative recombination sites and ion transport channels in Cs2AgBiBr6 thin films. Additionally, a positive correlation between carrier mobility and temperature was identified, explaining the discrepancy in performance between single crystals and thin film counterparts.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Multidisciplinary
Qiaoxia Xing, Chaoyu Song, Chong Wang, Yuangang Xie, Shenyang Huang, Fanjie Wang, Yuchen Lei, Xiang Yuan, Cheng Zhang, Lei Mu, Yuan Huang, Faxian Xiu, Hugen Yan
Summary: This study demonstrates strong terahertz plasmons in graphite thin films with dramatic tunability by even a moderate temperature change or an in situ bias voltage, and reveals that massive electrons and massless Dirac holes make comparable contributions to the plasmon response through magnetoplasmon studies. It not only sets up a platform for further exploration of two-component plasmas, but also opens an avenue for terahertz modulation through electrical bias or all-optical means.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
C. Yuan, M. Park, Y. Zheng, J. Shi, R. Dargis, S. Graham, A. Ansari
Summary: This study investigates phonon scattering processes and thermal conductivity in Al1-xScxN alloys grown by molecular beam epitaxy. The results show a decreasing trend in thermal conductivity with increasing scandium content, with an increase in thermal conductivity with temperature below 200 K and a plateau at higher temperatures. Application of an analytical model helps estimate the effects of scattering mechanisms on thermal conductivity behavior.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Young Kyun Choi, Tae Hyuk Kim, Jeong Han Song, Byung Ku Jung, Woosik Kim, Jung Ho Bae, Hyung Jin Choi, Jeonghun Kwak, Jae Won Shim, Soong Ju Oh
Summary: A temperature-insensitive strain sensor was developed by modifying the transport mechanism and temperature coefficient of resistance (TCR) of a PEDOT:PSS thin film through secondary doping with DMSO. The DMSO-doped PEDOT:PSS thin film exhibited band-like transport and maintained resistance with temperature change. The optimized thin film showed a TCR of less than 9 x 10(-5) K-1, 10(2) times lower than the as-prepared films, and improved carrier mobility due to morphological changes caused by DMSO doping.
Article
Materials Science, Multidisciplinary
Monica Susana Campos Covarrubias, Kristina Bockute, Mantas Sriubas, Kacper Dzierzgowski, Maria Gazda, Giedrius Laukaitis
Summary: Single-phase barium cerate films with a thickness of 1.5 μm were prepared using e-beam physical vapor deposition. The films showed differences in morphology, grain sizes, crystallographic orientation, and electrical properties depending on the substrate and deposition temperature. The conductivity values and activation energy were mainly influenced by the film microstructure and crystallographic orientation of grains. The strain relaxation of the films resulted in a decrease in conductivity.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Physics, Applied
Zong-Hui Gao, Zi-Xiao Wang, Dong-Yu Hou, Xin-Dian Liu, Zhi-Qing Li
Summary: Ta-doped SnO2 films with high conductivity and high optical transparency were successfully fabricated, and their electrical transport properties were investigated. For thick films deposited in pure argon, the interference effect between electron-phonon and electron-impurity scattering should be considered. For thin films, the conductivity and Hall coefficient show a linear relation with the logarithm of temperature, which cannot be explained by the Altshuler-Aronov type electron-electron interaction effect but can be interpreted by the electron-electron interaction effects in the presence of granularity.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Yangyu Guo, Xiao-Ping Luo, Zhongwei Zhang, Samy Merabia, Masahiro Nomura, Sebastian Volz
Summary: The phonon hydrodynamic regime in graphite films has been experimentally studied, but understanding and modeling of heat transport along the basal plane is still unclear. We predict that surface roughness significantly affects basal-plane thermal conductivity due to collective phonon drift. The occurrence of the phonon Knudsen minimum also depends strongly on surface roughness. We summarize basal-plane heat transport into coherent and incoherent regimes and speculate on the observed thickness-dependent thermal conductivity. Our work provides guidance for future experimental explorations of phonon hydrodynamics in graphitic micro- and nanostructures.
Article
Nanoscience & Nanotechnology
Xuning Zhang, Xingyue Liu, Bo Sun, Haibo Ye, Chunhua He, Lingxian Kong, Guangliang Li, Zhiyong Liu, Guanglan Liao
Summary: Researchers have successfully fabricated Cs2AgBiBr6 film using a sequential vacuum evaporation method, and developed a self-powered ultraviolet photodetector. The device shows a high on/off ratio and fast response time, along with stability under harsh conditions. Additionally, they have achieved a proof-of-concept specialized pattern recognition with a pixelated image sensor.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Polymer Science
Nayanathara Hendeniya, Kaitlyn Hillery, Boyce S. S. Chang
Summary: Block copolymers (BCPs) self-assemble into intricate nanostructures that enhance various applications. The equilibrium structure is determined by the molecular architecture and chemistry of BCPs. Non-equilibrium phases in BCPs have not been explored much due to the challenges in stabilizing metastable structures. This review focuses on solvent-induced and thermally induced pathways to control non-equilibrium phases in BCP thin films.
Article
Nanoscience & Nanotechnology
S. Levcenko, B. Teymur, D. B. Mitzi, T. Unold
Summary: Characterization of radiative transitions in trigonal Cu2BaSnS4 was experimentally studied via temperature and excitation intensity dependent photoluminescence measurements, revealing the contributions of free exciton, bound exciton, donor-acceptor-pair recombination, and free-to-bound transition. The activation energies and temperature shift for the radiative transitions were determined, with optical phonons playing a significant role in the energy shift of free exciton recombination above 90 K.
Review
Chemistry, Multidisciplinary
George Omololu Odunmbaku, Shanshan Chen, Bing Guo, Yongli Zhou, Nabonswende Aida Nadege Ouedraogo, Yujie Zheng, Jing Li, Meng Li, Kuan Sun
Summary: This paper discusses the optoelectronic properties of metal halide perovskites as an attractive photovoltaic material and focuses on the losses induced by nonradiative recombination processes in the device stack. The study reveals that nonradiative recombination processes at interfaces are more dominant than those within the bulk of the perovskite absorber, but there is still room for improvement in suppressing bulk nonradiative recombination. General routes for suppressing recombination processes within the bulk and at interfaces are also discussed.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Physical
Katir Ziouche, Ibrahim Bel-Hadj, Zahia Bougrioua
Summary: This paper discusses the optimization of electrical and thermoelectrical properties of nanostructured polysilicon material for use in thermoelectric devices. The nanostructured porous polysilicon (POpSi) thin film is shown to significantly reduce thermal conductivity while maintaining Seebeck coefficient, resulting in a substantial improvement in ZT compared to standard polySi layers. The integration of POpSi into planar TE microgenerators leads to a 28% increase in simulated conversion efficiency compared to those using standard polySi layers.
Article
Chemistry, Physical
Jiashang Zhao, Jia Li, Xiaohui Liu, Lars J. Bannenberg, Annalisa Bruno, Tom J. Savenije
Summary: This study investigates the structural and optoelectronic properties of co-evaporated MAPbI(3) films with varying thickness and a gradient in composition. Results show the presence of excess PbI2 and iodide deficiencies with increasing thickness, resulting in differently n-doped regions and the formation of an internal electric field. The charge carrier lifetimes are elongated in thicker films due to the separation of excess carriers under the influence of the electric field.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
V. M. Caselli, T. J. Savenije
Summary: This study investigated the charge carrier dynamics in perovskite-based bilayers with different transport layers using time-resolved microwave conductance measurements. The results showed that under bias illumination, the density of deep traps increased in the bare perovskite layer, leading to trap-mediated energy losses. However, adjusting the Fermi level of the transport layer can effectively reduce interfacial recombination losses.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Eitan Oksenberg, Ilan Shlesinger, Gokcen Tek, A. Femius Koenderink, Erik C. C. Garnett
Summary: The surface-enhanced counterparts of Raman scattering (SERS) and infrared (IR) absorption (SEIRAS) are commonly used to probe and identify nanoscale matter and small populations of molecules. In this study, a complementary surface-enhanced vibrational spectroscopy approach is presented to probe the vibrational signature of metal-bound molecular monolayers. Nanocavities are designed and produced with sharp and tunable visible (VIS) and mid-IR gap resonances by placing nanorods on a mirror that is coated with a thin dielectric spacer.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Anna Capitaine, Mehrnaz Bochet-Modaresialam, Peeranuch Poungsripong, Cleimence Badie, Vasile Heresanu, Olivier Margeat, Lionel Santinacci, David Grosso, Erik Garnett, Beniamino Sciacca
Summary: Large scale and low-cost nanopatterning of materials is of tremendous interest in optoelectronic devices. Nanoimprint lithography, a promising strategy for high-throughput nanofabrication, is enabled by pattern replication of an electron-beam lithography (EBL) master into PDMS. However, the use of colloidal nanoparticles as resist materials for nanoimprint lithography is still lacking deep understanding. In this study, supported metallic nanocubes and the surfactant layer trapped between nanocubes and the substrate were investigated to gain insights into nanoparticle imprinting. The results reveal the importance of a minimum thickness of the surfactant layer in mitigating van der Waals forces and enabling optimal nanoparticle mobility.
Article
Chemistry, Multidisciplinary
P. Tim Prins, Johanna C. van Der Bok, Thomas P. van Swieten, Stijn O. M. Hinterding, Andy J. Smith, Andrei V. Petukhov, Andries Meijerink, Freddy T. Rabouw
Summary: The synthesis of beta-NaYF4 nanocrystals from alpha-NaYF4 precursor particles was investigated using in situ small-angle and wide-angle X-ray scattering and ex situ electron microscopy. It was observed that the particle size distribution evolved from unimodal to bimodal, and eventually back to unimodal, with the final distribution being narrower than the initial distribution. The splitting of the size distribution was attributed to variations in the reactivity of the precursor particles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Pan Li, Sven H. C. Askes, Esther del Pino Rosendo, Freek Ariese, Charusheela Ramanan, Elizabeth von Hauff, Andrea Baldi
Summary: In this work, temperature measurements at the nanoscale were achieved by exploiting the combination of surface-enhanced Raman spectroscopy and the temperature dependence of Raman peaks in beta-CuPc. The temperature of plasmonic gold nanoparticles under laser irradiation was determined by measuring the temperature-dependent Raman shifts of beta-CuPc films coated on an array of Au nanodisks and using calibration curves. The extracted temperatures were confirmed to be consistent with numerical modeling results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Daniel Amgar, Gur Lubin, Gaoling Yang, Freddy T. T. Rabouw, Dan Oron
Summary: Semiconductor nanocrystal emission polarization is a crucial factor for nanocrystal-based technologies. A direct characterization method of the doubly excited-state relaxation transition dipole is proposed using heralded defocused imaging. The results reveal different transition dipole moments for different types of nanorods.
Article
Chemistry, Physical
Andrea Baldi, Sven H. C. Askes
Summary: This study breaks the limitations of traditional steady-state modes by using ultrashort light pulses and photothermal nanoparticle arrays to modulate the temperature of catalytic sites, achieving high energy efficiency and high catalytic activity in dynamic catalytic reactions. Numerical simulations demonstrate that pulsed photothermal catalysis can operate at room temperature, resist catalyst poisons, and access adsorbed reagent distributions that are normally inaccessible. The study provides key experimental parameters for controlling reaction rates in pulsed heterogeneous catalysis and offers specific recommendations to explore its potential in real experiments, paving the way for a more energy-efficient and process intensive operation of catalytic reactors.
Article
Materials Science, Multidisciplinary
Julia S. van der Burgt, Susan A. Rigter, Nelson de Gaay Fortman, Erik C. Garnett
Summary: A system that overcomes the limitations of solar tracking and poor absorption of diffuse sunlight by utilizing light-induced halide segregation in mixed halide perovskite films is presented. By using a monolayer of silica microspheres to focus direct sunlight, a low bandgap region is formed in the focal point through light-induced phase segregation, resulting in an increase in voltage characteristic for concentrating systems. Diffuse sunlight is still absorbed by the high bandgap material, avoiding the loss of diffuse sunlight seen in conventional concentrators. The concept shows a 6.6% absolute increase in power conversion efficiency compared to the film without microspheres, indicating the promising potential for a self-optimizing concentrating system.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Giorgio Colombi, Bart Boshuizen, Diana Chaykina, Leyi Hsu, Herman Schreuders, Tom J. Savenije, Bernard Dam
Summary: Rare-earth oxyhydride thin films exhibit reversible photochromism and photoconductivity at ambient conditions, but the underlying mechanism and relationship are not clear. In this study, in situ time-resolved measurements of optical and transport properties were performed on Gd-based oxyhydride thin films to investigate this question. It was found that the initial mechanism of charge transport is p-type large polaron conduction; however, upon photo-darkening, a 10(4)-fold increase in conductivity occurs, and n-type carriers dominate. Furthermore, both photochromism and photoconductivity were shown to originate from a single process, as the photoconductivity is exponentially proportional to the increase in optical absorption. This exponential relationship suggests that the formation of optically absorbing species responsible for photochromism is accompanied by a concerted increase in negative charge carriers in the Gd oxyhydride films.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mark J. J. Mangnus, Jur W. de Wit, Sander J. W. Vonk, Jaco J. Geuchies, Wiebke Albrecht, Sara Bals, Arjan J. Houtepen, Freddy T. Rabouw
Summary: Quantum dots (QDs) have emerged as bright and color-tunable light sources for various applications. Multiparticle spectroscopy (MPS) is demonstrated as a high-throughput method to acquire statistically relevant information about the emissions of QDs. CdSe-based QDs show narrower line widths, less spectral diffusion, and less inhomogeneous broadening compared to InP-based QDs. The experiments pave the way for large-scale characterization of single-QD emission properties and the rational design of future QD structures.
Article
Materials Science, Multidisciplinary
Hongyu Sun, Sarah Gillespie, Susan A. Rigter, Julia S. van der Burgt, Kunal Datta, Erik C. Garnett
Summary: Back-contact perovskite solar cells have the potential for high efficiency, but currently reported efficiencies are lower than planar perovskite solar cells. This study investigates the loss mechanisms that cause the low efficiency in back-contact perovskite solar cells. The results identify front surface recombination, increased nonradiative recombination at the hole contact layer/perovskite interface, and extraction barriers as the main mechanisms limiting high efficiencies.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Review
Chemistry, Physical
Jin Yan, Jiashang Zhao, Haoxu Wang, Mels Kerklaan, Lars J. Bannenberg, Bahiya Ibrahim, Tom J. Savenije, Luana Mazzarella, Olindo Isabella
Summary: Multiple-source thermal evaporation is an excellent technique for obtaining perovskite materials for solar cell applications. A simplified approach called single-cycle deposition (SCD) was proposed to obtain high-quality Cs(0.15)FA(0.85)PbI(2.85)Br(0.15) films. The optimized PVK film showed comparable properties to the one deposited by multicycle deposition. The formation and evolution of SCD PVK during annealing were also investigated.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Huygen J. Jobsis, Kostas Fykouras, Joost W. C. Reinders, Jacco van Katwijk, Joren M. Dorresteijn, Tjom Arens, Ina Vollmer, Loreta A. Muscarella, Linn Leppert, Eline M. Hutter
Summary: Through mechanochemical synthesis, controlled replacement of Bi3+ with Fe3+ enables tunable absorption onset between 2.1 and approximate to 1 eV. First-principles density functional theory (DFT) calculations suggest that this reduction in bandgap mainly originates from a decrease in the conduction band upon introduction of Fe3+, and predict a direct bandgap with >50% of Bi3+ replaced with Fe3+. The tunability of the conduction band energy is reflected in the photoredox activity of these semiconductors. These findings open new avenues for enhancing the sunlight absorption of double perovskite semiconductors and harnessing their full potential in sustainable energy applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Verena M. van der Werf, Jiashang Zhao, Jim S. Koning, Jasmeen Nespoli, Jos Thieme, Marcel Bus, Tom J. Savenije
Summary: Wet-chemical deposition of metal-halide perovskites shows great potential for electronic applications, particularly in solar cells. However, the distribution of light-induced excess charges over the polycrystalline material remains unclear. Using scanning microwave microscopy (sMIM), the local conductive properties of MAPbI3 and CsFAPbI3 were examined, revealing even distribution of excess charges over the grains in CsFAPbI3 but with local perturbations in carrier concentration due to defect-rich areas. This variation in carrier concentration under illumination affects the local Fermi level splitting in solar cells, highlighting the importance of suppressing it to minimize voltage deficit.
CELL REPORTS PHYSICAL SCIENCE
(2023)
