Article
Chemistry, Physical
Preeti Bhumla, Deepika Gill, Sajjan Sheoran, Saswata Bhattacharya
Summary: Spin-orbit coupling plays a key role in several intriguing quantum phenomena, including the Rashba-Dresselhaus effect. By studying the lead halide perovskite CsPbF3, researchers have discovered potential applications in spintronics, with tunable Rashba spin splitting and reversible spin textures observed. The findings suggest promising opportunities for perovskite-based spintronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Haiping Xu, Xuehua Dong, Zhizhuan Zhang, Ling Huang, Hongmei Zeng, Zhien Lin, Guohong Zou
Summary: In this study, a novel all-inorganic dual halogen emitter Cs2Cd2BrCl5 with a three-dimensional structure was successfully synthesized. It exhibits broadband white-light emission with high correlated color temperature, color rendering index, and photoluminescence quantum yield. The white-light emission originates from self-trapped excitons, and Cs2Cd2BrCl5 shows excellent structural and optical stability, making it a potential candidate for light-emitting diodes.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Multidisciplinary Sciences
Alessio Filippetti, Payal Wadhwa, Claudia Caddeo, Alessandro Mattoni
Summary: The Rashba-Edelstein effect allows for the conversion of charge current into spin current, enabling control of electron charge and magnetization in magnetoelectric and magneto-optical devices. This effect is demonstrated in 3D lead-halide perovskites, where a strong charge-spin conversion is achieved due to spin-momentum locking, which can be tuned by the injected charge density. The study reveals the relationship between charge-spin conversion and the topological transition from low-density torus-shaped Fermi surfaces to high-density simply connected Fermi surfaces. The results suggest that lead-halide perovskites are promising materials for spin-orbitronic applications.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Optics
Linjie Dai, Junzhi Ye, Neil C. Greenham
Summary: This study investigates the non-equilibrium processes in tin-lead perovskite nanocrystals and demonstrates the observation and modulation of slow relaxation. The slow cooling effect can be used to maximize the utilization of photon energy and potentially improve the efficiency of solar energy conversion.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Zixian Wang, Daofu Wu, Qiang Huang, Linfeng Guo, Yijia Wang, Weiwei Chen, Fei Wang, Juan Du, Zhengzheng Liu, Zhiping Hu, Yuxin Leng, Junan Lai, Peng He, Xiaosheng Tang
Summary: The application of organic-inorganic hybrid lead-free perovskite scintillators in X-ray imaging shows potential as a substitute for traditional lead-containing materials with lower costs and reduced self-absorption.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Meysam Pazoki, Roghayeh Imani, Andreas Rockert, Tomas Edvinsson
Summary: This study investigates the electronic properties and the influence of spacing of two-dimensional lead perovskite materials. It shows that larger cations decrease the electrostatic interaction between the layers, and spin-orbit coupling splits the conduction band states and lowers the bandgap. The spacing directly affects band curvature and charge carrier mobility perpendicular to the layers.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
T. Pandey, Mao-Hua Du, David S. Parker, L. Lindsay
Summary: Inorganic lead-free halide double perovskites exhibit non-toxic and stable optoelectronic properties, as well as large thermoelectric potentials and high carrier mobilities, making them promising for thermoelectric applications.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Lev-Ivan Bulyk, Taras Demkiv, Oleh Antonyak, Yaroslav M. Chornodolskyy, Roman Gamernyk, Andrzej Suchocki, Anatolii Voloshinovskii
Summary: This study investigates the effect of hydrostatic pressure on the luminescence properties of CsPbBr3 single crystals at 12 K. The intensity and energy position of free excitons and Rashba excitons change with increasing pressure.
DALTON TRANSACTIONS
(2023)
Review
Materials Science, Multidisciplinary
Min Wang, Zhengwei Yang, Chuang Zhang
Summary: Solution-processable lead halide perovskites exhibit excellent optical and electronic properties, with high quantum efficiency in photoluminescence and polarization characteristics, making them promising for next-generation optoelectronic materials and devices. The introduction of functional units such as chiral ligands can enhance or modulate the polarization in photoluminescence. Incorporating highly ordered microstructures into the materials is an effective way to further enhance the polarization properties at the macroscopic scale.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yoshihiro Ogawa, Hirokazu Tahara, Nanako Igarashi, Yasuhiro Yamada, Yoshihiko Kanemitsu
Summary: Utilizing heterodyne interference spectroscopy, we investigated the temperature dependence of the complex dielectric susceptibility spectrum of a perovskite CH3NH3PbBr3 single crystal. We observed two peaks below the exciton transition at the R point in the imaginary part of the spectrum, with different temperature dependences compared to the direct-transition exciton energy. The trends in both splitting width and peak intensities can be explained by the presence of a Rashba spin-split band.
Article
Chemistry, Multidisciplinary
Guillaume Vidon, Pia Dally, Mirella Al-Katrib, Daniel Ory, Minjin Kim, Etienne Soret, Eva Rangayen, Marie Legrand, Alexandre Blaizot, Philip Schulz, Jean-Baptiste Puel, Daniel Suchet, Jean-Francois Guillemoles, Arnaud Etcheberry, Muriel Bouttemy, Stefania Cacovich
Summary: Understanding the effects of X-rays on halide perovskite thin films is crucial for accurate characterization and practical usage of these materials in detection systems. This study utilizes advanced optical imaging techniques to comprehensively understand the degradation mechanism occurring in the material during photoemission spectroscopy measurements. The findings highlight the impact of X-rays on the perovskite layers, providing valuable insights for investigations using X-ray based techniques and the development of perovskite-based X-ray detectors and solar cells for space applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Jun Ren, Qin-Qin Wu, Rong-Rong Zhang, Yu-Ming Zhang, Chuan-Guo Shi
Summary: This work demonstrates the importance of carrier recombination sink for lowering the lasing threshold in lead halide perovskites (LHPs) and achieves low-threshold lasing behavior at room temperature through phase segregation induced perovskite heterostructures.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Electrical & Electronic
Guangguang Huang, Shazzad Rassel, Junfeng Qu, Shuhong Xu, Chunlei Wang, Dayan Ban
Summary: A novel two-dimensional Rashba piezoelectric material, TPRP, is proposed in this study, with optimized Rashba spin splitting energy achieved by adjusting local polarization. The Rashba spin splitting energy in unstrained TPRP is calculated as the highest among Br-based lead halide perovskites known to date, with potential further tuned by applying strain along the c axis.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Eugenia S. Vasileiadou, Xinyi Jiang, Mikael Kepenekian, Jacky Even, Michael C. De Siena, Vladislav V. Klepov, Daniel Friedrich, Ioannis Spanopoulos, Qing Tu, Imra S. Tajuddin, Emily A. Weiss, Mercouri G. Kanatzidis
Summary: This article introduces three new homologous series of two-dimensional lead iodide perovskites with different organic cations and discusses their structural and technological features. The different organic cations have an impact on the structure and optical properties of the material. The study reveals that the incorporation of specific organic cations leads to lattice distortions and the formation of trap states.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Congcong Chen, Luming Zhang, Xiaoqing Ji, Xuanyu Zhang, Yaping Gong, Rui Chen, Lingling Mao
Summary: Hybrid lead halide perovskites have high performance in optoelectronic applications, but are sensitive to moisture. This study shows that better coverage of hydrophobic organic cations enhances water stability, and demonstrates the water stability of new one-dimensional lead bromide compounds.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiancheng Dong, Yidong Peng, Dan Wang, Le Li, Chao Zhang, Feili Lai, Guanjie He, Xu Zhao, Xiu-Ping Yan, Piming Ma, Johan Hofkens, Yunpeng Huang, Tianxi Liu
Summary: In this study, a hierarchical nonwoven electronic textile (E-textile) is developed by imitating the transpiration system of plants and the water diode phenomenon. The E-textile exhibits unidirectional water transport, excellent mechanical matching, and reversible color-switching ability. As an on-skin bioelectrode, it demonstrates accurate and stable detection of biomechanical and bioelectrical signals, and can be applied in human-machine interfaces for gesture control and smart alarms. This hierarchically-designed E-textile offers a practical and innovative method for designing comfortable and daily applicable on-skin electronics.
Article
Chemistry, Physical
Leiqian Zhang, Jiajia Huang, Hele Guo, Lingfeng Ge, Zhihong Tian, Mingjie Zhang, Jingtao Wang, Guanjie He, Tianxi Liu, Johan Hofkens, Dan J. L. Brett, Feili Lai
Summary: By constructing a sulfonate-rich ion-exchange layer (SC-PSS) to modulate the transport and reaction of polyiodide and Zn2+, the corrosion and dendritic growth issues on the anode of zinc-iodine batteries can be addressed. The resulting batteries exhibit proper performance over 6000 cycles with high-capacity retention (90.2%) and reversibility (99.89%). The SC-PSS layer blocks polyiodide permeation through electrostatic repulsion and restricts undesirable 2D diffusion of Zn2+ by facilitating desolvation and chemisorption.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xabier Rodriguez-Martinez, Paula Hartnagel, Sergi Riera-Galindo, Gulzada Beket, Thomas Osterberg, Feng Gao, Thomas Kirchartz, Olle Inganas
Summary: Non-fullerene acceptors have revolutionized indoor organic photovoltaics with high power conversion efficiencies, but transferring this performance to larger-scale prototyping remains challenging. The PM6:IO4Cl blend, a successful indoor OPV photoactive layer, is investigated for its industrial potential, and the thick and semitransparent devices are fabricated in air. Anomalous current-voltage characteristics are observed, with the cathode side generally outperforming the anode side due to a dead layer at the PAL/anode contact interface. Symmetric J-V curves and improved light utilization efficiency are achieved by making the PALs thin enough. Certain all-polymer and polymer:fullerene blends are identified as suitable candidates for thick device up-scaling, and ternary blends show potential in mitigating electrical asymmetry.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Analytical
Imran Aslam, Maria Bravo, Indra Van Zundert, Susana Rocha, Maarten B. J. Roeffaers
Summary: This study developed a nonlinear optical approach for the identification and quantification of carbonaceous particles, such as carbon black (CB) and brown carbon (BrC), in biological samples. By illuminating CB and BrC nanoparticles (NPs) with a femtosecond pulsed laser at 1300 nm, their unique visible light fingerprint was observed, allowing for their identification in a biological context. Time-domain fluorescence lifetime imaging was also used to support the identification of these particles.
ANALYTICAL CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Ottavia Tartagni, Alexandra Borok, Emanuela Mensa, Attila Bonyar, Barbara Monti, Johan Hofkens, Anna Maria Porcelli, Giampaolo Zuccheri
Summary: Multicellular tumor spheroids are an improved in vitro model used for cancer biology research and drug screening. A simple method has been developed to create custom microwell arrays made of polydimethylsiloxane or agarose, providing a tunable mechanical environment. Various cancer and non-cancer cell lines can be cultured in these devices, and the growth, viability, and response to treatments can be characterized using molecular and imaging techniques. This platform enables statistically robust investigations and confocal microscopy imaging while retaining the geographical arrangement of spheroids.
CELLULAR AND MOLECULAR LIFE SCIENCES
(2023)
Article
Engineering, Environmental
Juanjuan Li, Xuelong Lv, Bo Weng, Maarten B. J. Roeffaers, Hongpeng Jia
Summary: The research focuses on the improvement of photo-thermal catalytic efficiency by engineering the light propagation using Pt nanoparticle decorated three-dimensionally ordered macroporous (3DOM) LaMn1.2O3. By enhancing the multiple scattering and slow photon effect, a 100% conversion of toluene is achieved with high selectivity to CO2 and good stability under solar light irradiation. The improved catalytic performance is attributed to the enhanced reducibility and migration of lattice oxygen and facilitated charge carrier migration.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Gang Wen, Volker Leen, Taoufik Rohand, Markus Sauer, Johan Hofkens
Summary: Expansion microscopy (ExM) is a recently developed super-resolution technique that enables visualization of biological targets at nanoscale resolution on conventional fluorescence microscopes. This review summarizes recent advances in ExM, with a focus on the chemical aspects of the method, including chemistries for biomolecule grafting and polymer synthesis. The combination of ExM with other microscopy techniques and the impact of fixation methods on ultrastructure preservation are also discussed. The review concludes with a perspective on existing challenges and future directions.
Article
Chemistry, Physical
Patricio Serafini, Alexis Villanueva-Antoli, Samrat Das Adhikari, Sofia Masi, Rafael S. Sanchez, Jhonatan Rodriguez-Pereira, Bapi Pradhan, Johan Hofkens, Andres F. Gualdron-Reyes, Ivan Mora-Sero
Summary: In this study, the introduction of guanidinium (GA+) during the synthesis of high-quality Cs(1-x)GA(x)PbI(3) perovskite nanocrystals (PNCs) was explored as a promising approach for the fabrication of efficient bright-red light-emitting diodes (R-LEDs). The substitution of Cs by 10 mol % GA allowed the preparation of mixed-cation PNCs with PLQY up to 100% and long-term stability for 180 days. This substitution compensated intrinsic defect sites and suppressed the non-radiative recombination pathway, leading to R-LEDs with improved performance and stability.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Kazuki Morita, Matthias J. Golomb, Miguel Rivera, Aron Walsh
Summary: Polarons are localized excess charge in materials, especially transition metal oxides, which are of fundamental interest for photochemical and electrochemical reactions. This study focuses on the model system rutile TiO2 and investigates the effect of impurity doping on polaron formation. Additionally, two metal-organic frameworks (MOFs), MIL-125 and ACM-1, are compared to TiO2, demonstrating the influence of ligands and connectivity on polaron mobility.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kasper Tolborg, Aron Walsh
Summary: The researchers investigated the tetragonal-to-cubic phase transition of ZrO2 at high temperatures using anharmonic lattice dynamics and molecular dynamics simulations. They found that the stability of cubic zirconia cannot be solely explained by anharmonic stabilization, but may also involve spontaneous defect formation and entropic stabilization, which is responsible for its superionic conductivity at elevated temperatures.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Kanta Ogawa, Hajime Suzuki, Aron Walsh, Ryu Abe
Summary: Three novel bismuth-based layered oxyiodides with increased water oxidation activity under visible light were reported. The electronic structure of these compounds is controlled by the Bi-Bi interaction, resulting in enhanced photoabsorption and reduced band gap. This research not only provided new photocatalysts for water splitting, but also offered a pathway to control the optoelectronic properties of lone-pair semiconductors.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yiyue Zhang, Lata Chouhan, Eduard Fron, Luca Leoncino, Karim Elkhouly, Harshita Bhatia, Weiming Qiu, Maarten B. J. Roeffaers, Johan Hofkens, Elke Debroye, Bapi Pradhan
Summary: We have developed a comprehensive surface optimization strategy for CsPbI3-xBrx NCs, resulting in a high-efficiency perovskite light-emitting diode (PeLED) exhibiting red emission with a maximum at 685 nm and an external quantum efficiency of up to 12.35%. The optimized device shows much improved operational stability with a half-lifetime (T(50)) of 50 min, which is seven times higher than the untreated device (T(50) = 7 min). Additionally, the passivated NCs exhibit non-blinking characteristics at the single-particle level.
Article
Chemistry, Physical
Dana Luebke, Paula Hartnagel, Markus Huelsbeck, Thomas Kirchartz
Summary: The adjustable band gap of molecular semiconductors is advantageous for indoor light harvesting. However, challenges such as processability in nonhalogenated solvents, high thicknesses, and high efficiencies at low illuminances exist. This study developed new methods to identify performance losses based on current density-voltage measurements and fabricated solar cells using a specific blend and solvent. The analysis revealed the importance of shunt resistances and trap-assisted recombination in achieving high photovoltaic performance.
Article
Nanoscience & Nanotechnology
Alexander E. J. Hoffman, Rafikul Ali Saha, Sander Borgmans, Pascal Puech, Tom Braeckevelt, Maarten B. J. Roeffaers, Julian A. A. Steele, Johan Hofkens, Veronique Van Speybroeck
Summary: Metal-halide perovskites (MHPs) have excellent properties for optoelectronic devices, but their long-term stability and phase transitions need to be understood. This study used GIWAXS, Raman spectroscopy, and theoretical calculations to investigate the structural phase transitions and phonon modes in CsPbBr3. The results provided direct evidence for the existence of these phase transitions and identified the Raman active phonon modes. This work enhances our understanding of the structure and lattice dynamics of CsPbBr3 and similar MHPs.
Article
Chemistry, Multidisciplinary
Chunhua Wang, Yang Ding, Biao Liu, Bo Weng, Johan Hofkens, Maarten B. J. Roeffaers
Summary: By theoretically and experimentally engineering the crystal structure of Cs3BiBr6 and Cs3Bi2Br9, their photocatalytic performance can be modulated. This study provides insights into the structure-photoactivity relationships of metal halide perovskites (MHPs) and offers a guideline for exploiting MHPs for efficient photocatalytic organic synthesis.
CHEMICAL COMMUNICATIONS
(2023)