Article
Chemistry, Physical
Anil Reddy Pininti, James M. Ball, Munirah D. Albaqami, Annamaria Petrozza, Mario Caironi
Summary: The study investigates the time-dependent electrical characteristics of field-effect transistors based on methylammonium lead iodide semiconductor and observes significant variations in output current, indicating hindered charge carrier mobility due to ion accumulation at grain boundaries. This research reveals the dynamic nature of field effect in solution-processed metal-halide perovskites and provides a methodology for characterizing charge carrier transport in emerging semiconductors.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Julian A. Steele, Eduardo Solano, Handong Jin, Vittal Prakasam, Tom Braeckevelt, Haifeng Yuan, Zhenni Lin, Rene de Kloe, Qiong Wang, Sven M. J. Rogge, Veronique Van Speybroeck, Dmitry Chernyshov, Johan Hofkens, Maarten B. J. Roeffaers
Summary: Controlling grain orientations within polycrystalline all-inorganic halide perovskite solar cells can help increase conversion efficiencies toward their thermodynamic limits, but the forces governing texture formation are still unclear. This study used synchrotron X-ray diffraction to investigate the mesostructure formation in polycrystalline CsPbI2.85Br0.15 powders, revealing that tetragonal distortions trigger preferential crystallographic alignment within polycrystalline ensembles.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jinshuai Zhang, Jiajia Zhao, Yongfeng Zhou, Yufei Wang, Karen Silva Blankenagel, Xuechun Wang, Madeeha Tabassum, Lei Su
Summary: Hybrid organic-inorganic perovskite single crystals show promise in high-performance optoelectronic devices due to their lack of grain boundaries and fewer defects. Research has found that surface nanopatterns on these crystals can lead to high polarization photodetection sensitivity under specific light conditions, which may have potential applications in future optoelectronic devices.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Junsang Cho, Preethi S. Mathew, Jeffrey T. DuBose, Prashant Kamat
Summary: 2D lead halide perovskites with tunable bandgap and enhanced chemical stability are useful for designing optoelectronic devices. Reducing dimensionality can increase resistance to light-induced ion migration, but also decreases the efficiency of halide ion segregation and segregation rate constant, leading to a decrease in charge-carrier lifetime.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Asma A. Medjahed, Tao Zhou, Juan Camilo Alvarez Quiceno, Pia Dally, Pascal Pochet, Tobias U. Schulli, David Djurado, Peter Reiss, Stephanie Pouget
Summary: This study investigates the mechanisms of strain and texture observed in MAPbI(3) thin films deposited on various oxide substrates. The results show that the strain of the perovskite layers is essentially relaxed behavior, contradicting the commonly accepted hypothesis. The texture in the perovskite layers is studied using synchrotron full-field diffraction X-ray microscopy, and the stability of different orientations is analyzed by DFT calculations.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Katerina Decka, Jan Kral, Frantisek Hajek, Petr Prusa, Vladimir Babin, Eva Mihokova, Vaclav Cuba
Summary: This study investigates the potential of lead halide perovskite nanocrystals (CsPbBr3) as time taggers in scintillating heterostructures for TOF-PET imaging, and confirms their applicability in ultrafast timing applications.
Review
Chemistry, Multidisciplinary
Junzhi Ye, Mahdi Malekshahi Byranvand, Clara Otero Martinez, Robert L. Z. Hoye, Michael Saliba, Lakshminarayana Polavarapu
Summary: Lead-halide perovskites have emerged as leading candidates for next-generation LEDs and solar cells due to their high photoluminescence quantum yields. Defects at the surface and grain boundaries significantly impact charge-carrier transport and efficiency, necessitating the development of effective passivation strategies for performance improvement.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Editorial Material
Chemistry, Multidisciplinary
Davide Raffaele Ceratti, Arava Zohar, Gary Hodes, David Cahen
Summary: Two studies disagree on the estimation of the proton diffusion coefficient in MAPbI(3), with one suggesting control by 1D defects and the other finding this idea unsupported by experimental data, proposing that the source of difference may lie elsewhere.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jaume Noguera-Gomez, Ismael Fernandez-Guillen, Pablo F. Betancur, Vladimir S. Chirvony, Pablo P. Boix, Rafael Abargues
Summary: Metal halide perovskite nanocrystals can exhibit excellent light-emission properties, but their use in functional films is challenging due to aggregation and instability issues. By using a metal-organic host matrix based on a sol-gel approach, controlled in situ crystallization of perovskite nanocrystals can be achieved, leading to high-performance nanocomposite thin films. The crystallization dynamics can be adjusted by ambient exposure and precursor concentration, allowing for fine-tuning of nanoparticle size and emission properties.
Article
Chemistry, Multidisciplinary
Lidia Romani, Andrea Speltini, Francesco Ambrosio, Edoardo Mosconi, Antonella Profumo, Marcello Marelli, Serena Margadonna, Antonella Milella, Francesco Fracassi, Andrea Listorti, Filippo De Angelis, Lorenzo Malavasi
Summary: This study presents a water-stable metal halide perovskite and demonstrates its application in promoting photocatalysis in aqueous medium, leading to impressive hydrogen evolution rate. The composite with g-C3N4 shows synergistic activity and efficient photocatalytic performance in water, paving the way for a new class of light-driven catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Pushpender Yadav, Kyeongdeuk Moon, Anupam Biswas, Christopher K. Herrera, Yunlu Zhang, Scott Calabrese Barton, Richard R. Lunt, Gary J. Blanchard, Seokhyoung Kim
Summary: Researchers have successfully synthesized two-dimensional Ruddlesden-Popper halide perovskite BA2PbBr4 nanowires using chemical vapor deposition for the first time. The nanowires exhibit strong absorption and radiative emission characteristics, making them promising candidates for nanophotonic and optical communication applications.
CHEMISTRY OF MATERIALS
(2023)
Review
Nanoscience & Nanotechnology
Hao Gu, Junmin Xia, Chao Liang, Yonghua Chen, Wei Huang, Guichuan Xing
Summary: This Perspective article investigates the advances in achieving phase-pure perovskite by manipulating precursor interactions and preparation methods, and discusses their prominent optoelectronic properties and applications. Compared to two-dimensional metal-halide perovskites with multiple quantum wells, the ones with phase-pure quantum wells have a flattened energy landscape, resulting in reduced energy or charge-transfer losses and increased stability.
NATURE REVIEWS MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Qiaojiao Gao, Jianhang Qi, Kai Chen, Minghao Xia, Yue Hu, Anyi Mei, Hongwei Han
Summary: This article discusses the preparation process and methods of halide perovskite crystals, including nanocrystals, single crystals, and thin films. High-performance devices rely on high crystal quality. The supersaturation of the solution determines the proportion and energy changes of aggregation, while nucleation and crystal growth processes determine crystal quality.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Rui Chen, Chang Liu, Yangyang Chen, Chao Ye, Shi Chen, Jinrong Cheng, Shixun Cao, Shenghao Wang, Anyang Cui, Zhigao Hu, He Lin, Jinlong Wu, Xiang Yang Kong, Wei Ren
Summary: This study developed a technique to synthesize millimeter-sized CsGeI3 single crystals using an aqueous solution, and examined their ferroelectric and photoelectric properties compared to theoretical predictions. These findings not only provide a new route for germanium-based perovskite single crystal synthesis, but also introduce potential applications in ferroelectric photovoltaics.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Francesca Fiorentino, Munirah D. Albaqami, Isabella Poli, Annamaria Petrozza
Summary: The instability of halide perovskites is a major challenge in their commercial applications, and forming 2D/3D interfaces is a popular method to improve device stability. However, diffusion and structural changes still occur under accelerated aging conditions.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Oncology
S. Heynemann, H. Yu, L. Churilov, G. Rivalland, K. Asadi, R. Mosher, F. Hirsch, C. Rivard, P. Mitchell
Summary: A retrospective analysis of NaPi2b expression among resected non-small cell lung cancer specimens revealed high expression in 34.5% of cases overall, with adenocarcinoma cases showing 65.9% high expression. High NaPi2b expression was associated with female sex, EGFR or KRAS mutation, TTF1 positivity, and improved overall survival. These findings suggest the potential of NaPi2b as a target for delivery of cytotoxic agents in lung adenocarcinoma patients.
CLINICAL LUNG CANCER
(2022)
Article
Polymer Science
Mohammad Mahdi Abolhasani, Sara Azimi, Masoud Mousavi, Saleem Anwar, Morteza Hassanpour Amiri, Kamyar Shirvanimoghaddam, Minoo Naebe, Jasper Michels, Kamal Asadi
Summary: Piezoelectric polymers are promising materials for pressure sensing devices, especially in wearable applications, due to their flexibility compared to inorganic materials. Efforts have been made to improve their weak piezoelectric voltage coefficient, including creating composites with PVDF and graphene, and producing porous nanofibers with different porosities. By solidifying composite fibers in specific regions of a phase diagram, it was shown that graphene loading can significantly enhance the piezoelectric output, making the sensors biocompatible and highly sensitive to body motion.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Achilleas Pipertzis, Kamal Asadi, George Floudas
Summary: This study investigated the phase behavior and dynamics of random P(VDF-TrFE) copolymers using various experimental techniques, revealing the coexistence of multiple weakly ordered phases and demonstrating the utility of segmental dynamics as a marker for the Curie transition.
Article
Physics, Applied
Morteza Hassanpour Amiri, Hamed Sharifi Dehsari, Kamal Asadi
Summary: This article outlines the measurement theory for a multiferroic capacitor using the lock-in technique and proposes a method to remove parasitic effects and retrieve the actual multiferroic signal.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Energy & Fuels
Rodrigo Garcia-Rodriguez, Antonio J. Riquelme, Matthew Cowley, Karen Valadez-Villalobos, Gerko Oskam, Laurence J. Bennett, Matthew J. Wolf, Lidia Contreras-Bernal, Petra J. Cameron, Alison B. Walker, Juan A. Anta
Summary: A combination of experimental studies and drift-diffusion modeling is used to investigate the appearance of inverted hysteresis in perovskite solar cells. The influence of different parameters on hysteresis behavior is examined, and a drift-diffusion model is used to simulate the experimental trends. It is shown that the accumulation and depletion of ionic charge at the interfaces modify carrier transport and injection/recombination processes, leading to hysteresis.
Article
Materials Science, Multidisciplinary
Fatemeh Haghshenas Gorgabi, Maria C. Morant-Minana, Haniyeh Zafarkish, Davood Abbaszadeh, Kamal Asadi
Summary: This study demonstrates an alternative and controllable resistance switching mechanism based on solid-state reduction of graphene oxide thin-films mediated by adsorbed water. The findings provide insights into the growth mechanism and growth kinetics of reduced graphene oxide, enabling the deterministic tuning of resistance in graphene oxide devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Morteza Hassanpour Amiri, Rose Fatscher, Rebecca Taylor, Paulo R. F. Rocha, Chris R. Bowen, Kamal Asadi
Summary: Energy harvesting devices have become a sustainable energy source for low-power electronics. However, the lack of well-defined metrics and details in research papers has led to qualitative rather than quantitative research. To improve reproducibility, a standardized measurement and data reporting protocol is suggested.
Article
Chemistry, Multidisciplinary
Hamed Sharifi Dehsari, Morteza Hassanpour Amiri, Kamal Asadi
Summary: Experimental realization of thin films with significant room-temperature magnetoelectric coupling coefficient α(ME) without an external DC magnetic field has been challenging. Here, large α(ME) of 750 +/- 30 mV Oe(-1) cm(-1) is achieved in multiferroic polymer nanocomposites (MPCs) thin films. The MPCs consist of PMMA-grafted cobalt-ferrite nanoparticles uniformly dispersed in piezoelectric polymer P(VDF-TrFE). Nanoparticle agglomeration is reduced by surface functionalization with PMMA, enabling the uniform dispersion of nanoparticles in submicrometer thin films. This research can promote the development of flexible and printable multiferroic electronic devices for sensing and memory applications.
Article
Chemistry, Multidisciplinary
Nathan S. Hill, Matthew V. Cowley, Nadja Gluck, Miriam H. Fsadni, Will Clarke, Yinghong Hu, Matthew J. Wolf, Noel Healy, Marina Freitag, Thomas J. Penfold, Giles Richardson, Alison B. Walker, Petra J. Cameron, Pablo Docampo
Summary: Despite the advancements in perovskite solar cells, understanding the interfaces in these cells remains limited. The mixed ionic-electronic nature of these cells leads to compositional variations at the interfaces, making it difficult to accurately measure the band energy alignment. To address this, a pulsed measurement technique is developed to characterize the energy drop across the perovskite layer in a functioning device. This approach allows for measurements of interfacial energy level alignment in a complete device without the need for expensive vacuum equipment.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Will Clarke, Matthew V. Cowley, Matthew J. Wolf, Petra Cameron, Alison Walker, Giles Richardson
Summary: By analyzing a drift-diffusion model of a planar three-layer perovskite solar cell using asymptotic techniques, we uncover the cause of inverted hysteresis and obtain a simple approximate model that shows excellent agreement with numerical simulations. This provides fundamental insights into the phenomenon and reconciles the alternative explanations found in the literature.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Energy & Fuels
Will Clarke, Matthew J. Wolf, Alison Walker, Giles Richardson
Summary: We present a drift-diffusion model of a perovskite solar cell (PSC) where carrier transport in the charge transport layers (TLs) deviates from the Boltzmann approximation. The form of the density of states function and its influence on carrier transport are discussed. Comparisons between full FD and Boltzmann models show significant differences in power conversion efficiency and dynamic simulations. The study suggests the inadequacy of the standard Boltzmann-based approach and demonstrates that the full FD treatment gives a more accurate representation of steady-state performance.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Beomjin Jeong, Michael Wuttke, Yazhou Zhou, Klaus Muellen, Akimitsu Narita, Kamal Asadi
Summary: Graphene nanoribbons (GNRs) have great potential for nanoscale devices due to their excellent electrical properties. However, their application in large-scale devices is challenging due to the lack of a convenient, nonhazardous, and nondestructive transfer method. Researchers have developed a simple acid-free transfer method for fabricating field-effect transistors (FETs) with a random network of GNRs. The resulting GNR-FETs exhibit excellent FET characteristics and can be used for nonvolatile memory, providing a simple route for GNRs in various optoelectronic devices.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Beomjin Jeong, Michael Wuttke, Yazhou Zhou, Klaus Muellen, Akimitsu Narita, Kamal Asadi
Summary: Graphene nanoribbons (GNRs) have great potential for nanoscale devices due to their excellent electrical properties. However, the lack of a facile, nonhazardous, and nondestructive transfer method has hindered their application in large-scale devices. In this study, we developed a simple acid (HF)-free transfer method to fabricate field-effect transistors (FETs) with a monolayer composed of a random network of GNRs. The resulting GNR-FETs exhibited excellent FET characteristics and allowed for the demonstration of the first GNR-based nonvolatile memory. This process provides a simple route for the utilization of GNRs in various optoelectronic devices.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
