Review
Chemistry, Multidisciplinary
Luca De Trizio, Ivan Infante, Liberato Manna
Summary: The surface chemistry of leadhalide perovskite nanocrystals is crucial for their stability and optical properties. A multidisciplinary approach including chemical, structural, and spectroscopic analyses along with atomistic modeling is used to understand the ligand shell, ligand-nanocrystal, and ligand-solvent interactions. Different surface terminations of CsPbBr3 nanocrystals are achieved by employing various synthesis methods, resulting in high photoluminescence quantum yields (PLQY) of up to 100%.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Einav Scharf, Franziska Krieg, Orian Elimelech, Meirav Oded, Adar Levi, Dmitry N. Dirin, Maksym Kovalenko, Uri Banin
Summary: This study investigates the effects of different stabilizing surface ligands on the kinetics of the cross-anion exchange reaction and finds that zwitterionic ligands can slow down the process, offering improved stability and enhanced solubility.
Article
Chemistry, Physical
Lijun Chen, Jun Xi, Eelco Kinsa Tekelenburg, Karolina Tran, Giuseppe Portale, Christoph J. Brabec, Maria Antonietta Loi
Summary: Two terminal passive devices are considered as promising candidates to overcome the processor-memory bottleneck in Von Neumann computing architectures. Metal halide perovskites, with their high defect density and low migration barrier, are attractive for memory device applications. However, the use of non-toxic materials and scalable deposition processes should be emphasized for future neuromorphic technology.
Article
Chemistry, Multidisciplinary
Zhiyuan Huang, Ji Hao, Jeffrey L. Blackburn, Matthew C. Beard
Summary: This research demonstrates control of pyroelectricity in nanocrystalline systems by constructing a system built from spherical PbS quantum dots that can self-assemble into close-packed arrays or disperse into a polymer, both exhibiting a pyroelectric response. The polarization of each quantum dot can be easily tuned by constructing different Janus-ligand shells.
Article
Materials Science, Multidisciplinary
Tongyu Shi, Xi Chen, Yuhao Deng, Hao Huang, Jiahong Wang, Rui He, Yanliang Liu, Xingchen He, Jia Li, Paul K. Chu, Xue-Feng Yu
Summary: A novel chemical vapor method has been developed to synthesize ultrastable lead halide perovskite-zeolite composites in which CsPbX3 perovskite quantum dots are grown in situ in the nanopores of the ZSM-5 substrate. The encapsulation structure obtained through this method not only boosts the stability of CsPbX3 quantum dots but also allows for tuning of the emission wavelength range.
NPG ASIA MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Syed Akhil, V. G. Vasavi Dutt, Nimai Mishra
Summary: This review summarizes the progress of amine-free synthesis approaches of colloidal cesium lead halide perovskite nanocrystals, including synthetic routes and post-synthetic treatment steps. The analysis of the photo-luminescence properties and device performances of these nanocrystals is provided, along with prospects for future research directions.
Article
Chemistry, Physical
Jie Chen, Chonglin Yuan, Weili Liang, Nanlin Zhang, Xiaolin Zhang, Zhiwei Wang, Chengqun Wang, Xiuting Li
Summary: The study found that the shell and core Pb(II) of PbS-PbI2 QDs can be distinguished by an electrochemical method, and the shell/core composition of the QDs can be determined based on the peak charge ratio. XPS analysis and UV-vis spectroscopy further indicated that the shell/core ratio of PbS-PbI2 QDs varies with changes in ligand PbI2 concentration.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Energy & Fuels
Severin Siegrist, Pranjal Nandi, Radha K. K. Kothandaraman, Aribia Abdessalem, Ayodhya N. N. Tiwari, Fan Fu
Summary: The blade coating method can upscale the low-cost and solution-based perovskite photovoltaic devices. However, the control of charge transport layer thickness is challenging due to the inherent nature of the blade coating process. This study systematically investigates the film thickness and uniformity of blade-coated SnO2 colloidal dispersions in the Landau-Levich regime by varying substrate temperature, solution volume, solution concentration, and coating speed. The findings show that the advancing meniscus height heavily affects the SnO2 film thickness, and the dispensed solution volume can improve thickness uniformity.
Review
Chemistry, Multidisciplinary
Chunlong Li, Jie Li, Zhengping Li, Huayong Zhang, Yangyang Dang, Fangong Kong
Summary: Recent breakthroughs have been made in nanostructured halide perovskites LEDs due to their high versatility in managing charge carriers, but commercial applications are hindered by the toxicity of lead. Current research is shifting towards lead-free perovskite nanocrystals for future development.
Article
Energy & Fuels
Jian Cheng, Fan Liu, Zhengqiang Tang, Yuelong Li
Summary: Perovskite solar cells have rapidly advanced in the field of photovoltaics since 2009, but addressing the challenges of manufacturing large-scale modules is essential for commercialization.
Article
Optics
Xianghua Wang, Yong Yang, Xuedong Li, Wenbin Li, Juntao Hu, Wen-Hua Zhang
Summary: Inorganic cesium lead halide perovskite nanocrystals are synthesized using a modified hot injection method with in situ passivation of surface defects. The surface chemistry and lattice structure of the nanocrystals differ from those obtained through a postsynthesis exchange strategy. The emission wavelength and photoluminescence quantum yield of the nanocrystals can be tuned by adjusting the halide ratio, and the in situ passivation treatment shows promise for electroluminescence in light-emitting diodes.
Article
Energy & Fuels
Mahmoud Zendehdel, Narges Yaghoobi Nia, Barbara Paci, Amanda Generosi, Aldo Di Carlo
Summary: A universal coating strategy combining blade and spin coating has been introduced to achieve zero-waste-generation of perovskite precursor materials for efficient and cost-effective large-area perovskite solar cell fabrication. This method significantly reduces material consumption and operational costs, while improving the photo-conversion efficiency and thermal stability of the solar cells.
Article
Chemistry, Applied
Siqing Nie, Qifan Feng, Ziheng Tang, Yaolin Hou, Xiaofeng Huang, Ruihao Chen, Fang Cao, Binghui Wu, Jun Yin, Jing Li, Nanfeng Zheng
Summary: The study developed a high-performance electron transport layer for the fabrication of large-area efficient and long-term stable perovskite solar modules. The use of this electron transport layer improves the crystallization of perovskite film, stabilizes the interface, and reduces non-radiative recombination defects, resulting in improved efficiency and stability of the modules.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Jun Fang, Dongxu Lin, Weixin Huang, Xin Wang, Huan Li, Sibo Li, Guanshui Xie, Daozeng Wang, Longbin Qiu
Summary: Organic-inorganic perovskite solar cells can be fabricated through one-step antisolvent or sequential two-step spin coating processes. Despite the controllability of the sequential two-step process, it has drawbacks such as toxic solvents and unsuitability for large-area surfaces. To tackle these issues, a sequential two-step process combining thermal evaporation of scalable PbI2 and a blading process of organic salt was developed. However, the device performance was inferior to the two-step solution coating process. Therefore, a temperature-assisted crystal growth method was developed to improve the perovskite film morphology, resulting in a champion efficiency of 19.8%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Yameen Ahmed, Deepak Thrithamarassery Gangadharan, Mohammad Reza Kokaba, Vishal Yeddu, Muhammad Awais, Dongyang Zhang, Vahid Kamraninejad, Makhsud I. Saidaminov
Summary: In this study, perovskite solar cells (PSCs) were fabricated using scalable methods in ambient air, achieving high efficiency and excellent tolerance to oxygen and moisture. The use of a resurfacing strategy improved charge carrier recombination and the devices showed stable performance without encapsulation.
Article
Chemistry, Multidisciplinary
Jacopo Pinna, Razieh Mehrabi Koushki, Dnyaneshwar S. Gavhane, Majid Ahmadi, Suhas Mutalik, Muhammad Zohaib, Loredana Protesescu, Bart J. Kooi, Giuseppe Portale, Maria Antonietta Loi
Summary: Nanoscale-level controlled ordering of colloidal quantum dots allows the achievement of outstanding transport properties, paving the way toward a new generation of optoelectronic devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Erik Kirstein, Evgeny A. . Zhukov, Dmitri R. . Yakovlev, Nataliia E. Kopteva, Carolin Harkort, Dennis Kudlacik, Oleh Hordiichuk, Maksym V. Kovalenko, Manfred Bayer
Summary: This research investigates the coherent spin dynamics of Ruddlesden-Popper (PEA)2PbI4 perovskites through picosecond pump-probe Kerr rotation experiments in an external magnetic field. The study identifies the Larmor spin precession of resident electrons with a spin dephasing time of 190 ps, as well as a long longitudinal spin relaxation time of 25 μs in weak magnetic fields. A significant anisotropy of the electron g-factor is also found, with in-plane value of +2.45 and out-of-plane value of +2.05. Furthermore, the exciton out-of-plane g-factor is measured to be +1.6 using magneto-reflectivity. This work contributes to the understanding of the spin-dependent properties and spin dynamics of two-dimensional perovskites.
Article
Chemistry, Multidisciplinary
Federico Montanarella, Quinten A. Akkerman, Dennis Bonatz, Maaike M. van der Sluijs, Johanna C. van der Bok, P. Tim Prins, Marcel Aebli, Alf Mews, Daniel Vanmaekelbergh, Maksym Kovalenko
Summary: Researchers have used in situ synchrotron-based small-angle X-ray scattering and optical absorption spectroscopy to gain new insights into the nucleation, growth, and self-assembly of lead halide perovskite nanocrystals. They found that dispersed 3 nm Cs[PbBr3] agglomerates are the key intermediate species, which slowly nucleate into crystals and release Cs[PbBr3] monomers for further growth. They also discovered the mechanism of spontaneous superlattice formation when the nanocrystals reach a critical size of 11.6 nm.
Article
Materials Science, Multidisciplinary
Hong-Hua Fang, Eelco K. Tekelenburg, Haibo Xue, Simon Kahmann, Lijun Chen, Sampson Adjokatse, Geert Brocks, Shuxia Tao, Maria Antonietta Loi
Summary: Low-dimensional halide perovskites with broad emission have promising applications as white light sources. This study investigates the origin of the broadband emission in sub-bandgap region of mixed lead-tin 2D perovskite films. The bandgap can be tuned by the lead-tin ratio, while the photoluminescence is broad and fairly insensitive to the relative amount of Pb and Sn. The low-dimensional systems show less bandgap bowing than their 3D counterpart, possibly due to the smaller spin-orbit coupling effect. Time-resolved photoluminescence reveals ultrafast decay in the high-energy range and slower broadband emission decay, indicating defects as the origin of the broadband emission.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Lorenzo Di Mario, David Garcia Romero, Meike J. Pieters, Fabian Eller, Chenhui Zhu, Giovanni Bongiovanni, Eva M. Herzig, Andrea Mura, Maria A. Loi
Summary: The use of diphenyl ether (DPE) and the non-halogenated solvent o-xylene has been proposed to fabricate completely halogen-free organic solar cells. The addition of DPE improves the efficiency and stability of the solar cells by enhancing molecular ordering and charge carrier collection. Furthermore, it reduces non-radiative recombination losses and improves exciton diffusion. This study provides an approach to make the fabrication of environmentally friendly organic solar cells more suitable for large scale production.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Eelco K. Tekelenburg, Nawal Aledlbi, Lijun Chen, Graeme R. Blake, Maria A. Loi
Summary: Layered metal-halide perovskites offer great potential for optoelectronic devices due to the ability to tune their structural and optical properties using various organic cations. However, the impact of cations on crystalline structure in Sn-based perovskites is not well understood. By using two different cations, OBE and EDBE, we were able to obtain planar and corrugated perovskite structures respectively, where the hydrogen bonding between EDBE cations stabilizes the corrugated structure. The different optical properties of the two compounds, OBESnI4 and EDBESnI4, are found to have an extrinsic origin.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Huanyu Zhang, Faruk Okur, Claudia Cancellieri, Lars P. H. Jeurgens, Annapaola Parrilli, Dogan Tarik Karabay, Martin Nesvadba, Sunhyun Hwang, Antonia Neels, Maksym V. Kovalenko, Kostiantyn V. Kravchyk
Summary: Li dendrites form in Li7La3Zr2O12 (LLZO) solid electrolytes due to volume changes and voids at the Li metal/LLZO interface. Dense-porous LLZO membranes provide a solution by storing lithium in the pores, avoiding volume changes and void formation. The reported method of sequential tape-casting allows for the production of bilayer membranes with high performance.
Article
Nanoscience & Nanotechnology
Heng Zhang, Majid Ahmadi, Wastu Wisesa Ginanjar, Graeme R. Blake, Bart J. Kooi
Summary: The nanostructure, thermal stability, and thermoelectric power factor of Sb2Te3/Ge1+xTe multilayers prepared by pulsed laser deposition are investigated. It is found that the layered structures of the multilayers are unstable upon heating, resulting in the dissolution of Sb2Te3 sublayers into Ge1+xTe. The dissolution depends on the relative thickness of the Ge1+xTe sublayer, which leads to variations in the nanostructure and influences the Seebeck coefficient and electrical conductivity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Jennifer Hong, Suhas Mutalik, Matteo Miola, Dominic Gerlach, Razieh K. Mehrabi, Majid Ahmadi, Bart J. Kooi, Giuseppe Portale, Petra Rudolf, Paolo P. Pescarmona, Loredana Protesescu
Summary: Metal borides, such as nickel borides (NixB), are widely used materials in industry. However, their exploration at the nanoscale has been limited due to synthesis difficulties. In this study, a solid-state method was developed to synthesize NixB nanopowders and convert them into colloidal suspensions. The synthesis was achieved using commercially available salts and adjusting the synthetic parameters under mild and solvent-free conditions. Through mechanistic studies, it was found that Ni nanoclusters are intermediates in the boriding process, and size control can be achieved through reaction mediators. The stabilized NixB nanocrystals were then converted into stable inks for further solution processing applications, providing tools for the development of NixB-based catalysts and other metal boride colloidal nanostructures.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Wei Zhang, Hui Wang, Bart J. Kooi, Yutao Pei
Summary: A non-equiatomic interstitial-strengthened high entropy alloy (iHEA), Fe49.5Mn30Co10Cr10C0.5 (at.%), is manufactured by laser powder-bed fusion (LPBF) with stripe and chessboard scanning strategies. The relationship between laser scanning strategies and resulting microstructure, textures, and anisotropic mechanical properties in as-built iHEA is investigated. Results show that LPBF processed iHEA exhibits excellent strength-ductility synergy due to combined deformation mechanisms. The mechanical anisotropy is more evident in samples printed by the stripe scanning strategy compared to the chessboard-scanned samples, attributed to heterogeneous grain morphology and crystallographic texture resulting from different scanning strategies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Anouk S. S. Goossens, Majid Ahmadi, Divyanshu Gupta, Ishitro Bhaduri, Bart J. J. Kooi, Tamalika Banerjee
Summary: This study presents a compelling alternative memristive device that shows enhanced memristive memory window and maintained analog behavior through areal downscaling. By directly integrating the device designs on semiconducting Nb-doped SrTiO3, the electric field effects at edges are leveraged to increase the dynamic range in smaller devices. The findings also reveal the influence of applied electric fields on the physical extent of an interfacial layer, as observed through scanning transmission electron microscopy.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Huanyu Zhang, Giulia Paggiaro, Faruk Okur, Janis Huwiler, Claudia Cancellieri, Lars P. H. Jeurgens, Dmitry Chernyshov, Wouter van Beek, Maksym V. Kovalenko, Kostiantyn V. Kravchyk
Summary: The deployment of LLZO garnets as solid-state electrolytes for Li-metal solid-state batteries is hindered by the reactivity with water and carbon dioxide, leading to the formation of a contamination layer on the LLZO surface. High temperature annealing is studied as a thermal cleaning method, which effectively reduces the contamination but also results in the formation of a different phase on the LLZO surface. The impact of these factors on the performance of Li/LLZO/Li symmetrical cells was evaluated.
ACS APPLIED ENERGY MATERIALS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Matthias Klimpel, Huanyu Zhang, Maksym V. Kovalenko, Kostiantyn V. Kravchyk
Summary: In this comment, the authors argue for the importance of standardizing the measurement of the critical current density at which Li dendrites begin to penetrate LLZO solid-state electrolyte.
COMMUNICATIONS CHEMISTRY
(2023)
Correction
Chemistry, Physical
Stephanie L. Brock, Maksym V. Kovalenko, Mary Ann Meador
Article
Chemistry, Multidisciplinary
Julia Nette, Federico Montanarella, Chenglian Zhu, Taras V. V. Sekh, Simon C. C. Boehme, Maryna I. I. Bodnarchuk, Gabriele Raino, Philip D. D. Howes, Maksym V. V. Kovalenko, Andrew J. J. deMello
Summary: The study presents the highly controlled, microfluidic template-assisted self-assembly of CsPbBr3 nanocrystals into spherical supraparticles, achieving precise control over average supraparticle size by varying the nanocrystal concentration and droplet size. This enables the synthesis of highly monodisperse, sub-micron supraparticles (with diameters between 280 and 700 nm).
CHEMICAL COMMUNICATIONS
(2023)