Article
Chemistry, Organic
Kosho Makino, Kumi Tozawa, Yuki Tanaka, Akiko Inagaki, Hidetsugu Tabata, Tetsuta Oshitari, Hideaki Natsugari, Hideyo Takahashi
Summary: The study revealed that the photoracemization reaction of chiral alkyl aryl sulfoxides is extremely fast and influenced by various substitution patterns. However, chiral sulfoxides with easily oxidizable functional groups are not suitable for this photo-isomerization.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Jiang-Feng Hong, Bin Wang, Xiao-Yi Zhang, Han Xu, Hai-Xia Zhao, La-Sheng Long, Lan-Sun Zheng
Summary: Hybrid organic-inorganic halide perovskites have received interest for their structure diversity and potential application in optoelectronic, solar cells, NLO, and ferroelectrics. Water molecules can induce structural symmetry breaking and transformation, which inspire further explorations on water-involved 2D materials.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Yi Xie, Jack Morgenstein, Benjamin G. G. Bobay, Ruyi Song, Naidel A. M. S. Caturello, Peter C. C. Sercel, Volker Blum, David B. B. Mitzi
Summary: Cation mixing in 2D HOIP structures is an important factor for modifying organic templating effects and tailoring inorganic structures. In this study, a chiral-chiral mixed-cation system is demonstrated, where a small amount of chiral cation S-2-MeBA can be doped into S-BrMBA(2)PbI4 to modulate the structural symmetry. The concentration of S-2-MeBA determines the structural change from higher symmetry state (C2) to the lowest symmetry state (P1). Atomic occupancy analysis suggests that a specific S-BrMBA cation site is preferentially substituted by S-2-MeBA. The chiral cation doping system provides a material design strategy for enhancing emergent properties sensitive to symmetry breaking.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Meng-En Sun, Yonggang Wang, Fei Wang, Jiangang Feng, Lingrui Wang, Hanfei Gao, Jiazhen Gu, Gaosong Chen, Yongping Fu, Kejun Bu, Tonghuan Fu, Junlong Li, Xujie Lu, Lei Jiang, Yuchen Wu, Shuang-Quan Zang
Summary: The structural and optical differences between chiral and achiral perovskites were systematically investigated under hydrostatic pressure. The results showed that the chiral perovskite undergoes a structural transformation and exhibits a negative linear compressibility effect, while the achiral perovskite does not show these changes.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Amin Morteza Najarian, Maral Vafaie, Randy Sabatini, Sasa Wang, Peng Li, Shihong Xu, Makhsud I. Saidaminov, Sjoerd Hoogland, Edward H. Sargent
Summary: Two-dimensional hybrid perovskites incorporating organic compounds exhibit multiple structural arrangements depending on the ratio of organic content, annealing temperature, and substrate surface characteristics. Through experimental examination, researchers identify five crystallization scenarios, with only one leading to the cointercalation of organic modules. Noncovalent bonds, such as hydrogen and halogen bonding, play a crucial role in influencing the organic sublattice in these hybrid perovskites.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Lucas Scalon, Julius Brunner, Maria Gabriella Detone Guaita, Rodrigo Szostak, Miguel Albaladejo-Siguan, Tim Kodalle, L. Andres Guerrero-Leon, Carolin M. Sutter-Fella, Caio C. Oliveira, Yana Vaynzof, Ana Flavia Nogueira
Summary: The introduction of chiral organic spacers in low-dimensional metal-halide perovskites leads to chiroptical activity, which is attractive for spintronic applications. However, there is still a lack of comprehensive understanding regarding the formation of structure and the ability to control phase purity in such materials. This study explores the impact of processing conditions on the phase purity, microstructure, and chiroptical properties of chiral 2D perovskites. The anisotropic emergence of a 1D perovskite inside the 2D matrix and its dependence on the organic cation chirality, solvent, and thermal annealing conditions are demonstrated.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Energy & Fuels
Jun Yang, Tinghuan Yang, Dongle Liu, Yalan Zhang, Tao Luo, Jing Lu, Junjie Fang, Jialun Wen, Zhao Deng, Shengzhong (Frank) Liu, Lihua Chen, Kui Zhao
Summary: This study demonstrates the crystallization control of ACI perovskites through solvent engineering, leading to improved film crystallinity and smoothness, as well as enhanced optoelectronic properties. The resulting ACI perovskite solar cells exhibit high efficiency and stability, serving as an ideal option for high-performance 2D perovskite solar cells.
Article
Chemistry, Physical
Ya-Ru Wang, Alessandro Senocrate, Marko Mladenovic, Algirdas Ducinskas, Gee Yeong Kim, Ursula Rothlisberger, Jovana Milic, Davide Moia, Michael Graetzel, Joachim Maier
Summary: This study analyzes the changes in optical absorption of 2D Dion-Jacobson mixed halide perovskite thin films under constant illumination and reveals the reversible photo-induced phase segregation phenomenon. The authors further investigate the temperature-dependent absorption measurements and provide strategies to address the role of light in the thermodynamic properties of these materials.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Valerii Y. Sirenko, Olesia Kucheriv, Elzbieta Gumienna-Kontecka, Sergiu Shova, Il'ya A. Gural'skiy
Summary: In this study, novel 2D hybrid perovskites based on chiral alpha-amino acid L-histidine are presented. These compounds show non-centrosymmetric crystal structures and exhibit multiband absorption and single-peak photoluminescence. Additionally, they demonstrate excellent thermal stability.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Jonathan D. Bell, Iain Robb, John A. Murphy
Summary: Highly selective photocatalytic functionalisations of alkyl groups in aryl alkyl ethers have been achieved using a phosphate-based acridinium catalyst and visible light irradiation. The reaction proceeds through direct single-electron oxidation and subsequent deprotonation steps, resulting in a wide range of functionalised products in good to excellent yield.
Article
Energy & Fuels
Weifei Fu, Ting Zhao, Hongbin Liu, Francis Lin, Lijian Zuo, Xiaosong Li, Alex K. -Y. Jen
Summary: A strategy of replacing the insulating spacer with conducting spacer is proposed, successfully converting the spacer from a charge-transporting barrier to a charge-transporting bridge. By designing new organic spacer cations, highly efficient and stable quasi-2D perovskite solar cells have been achieved.
Article
Chemistry, Physical
Ching-Pei Hsu, Chao-An Liu, Chu-Chiao Wen, Yi-Hung Liu, Ya-Fan Lin, Ching-Wen Chiu
Summary: This study reports the generation of stable chiral alkyl aluminum cationic complexes with high Lewis acidity and catalytic ability in organic transformations.
Article
Chemistry, Multidisciplinary
Lin Sui Li, Wen Juan Wei, Hong Qiang Gao, Yu Hui Tan, Xiao Bo Han
Summary: This study presents a 2D chiral hybrid halide perovskite ferroelectric that undergoes two continuous phase transitions and has the potential for diverse functional properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Yiman Zhao, Zhonghao Zhou, Xiaolong Liu, Ang Ren, Shiyang Ji, Yuwei Guan, Zhen Liu, Haidi Liu, Penghao Li, Fengqin Hu, Yong Sheng Zhao
Summary: An on-chip Stokes photodetector based on chiral 2D/quasi-2D perovskite lateral heterojunction nanowire arrays with high polarization selectivity and photoresponsiveness is reported. The device exhibits reliable ability for polarization detection, providing useful enlightenment for direct full-Stokes polarization detection in optoelectronic integrated circuits.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Brian A. Ko, Keith Berry, Zhaojun Qin, Alexei Sokolov, Jonathan Hu, Marlan O. Scully, Jiming Bao, Zhenrong Zhang
Summary: Research has shown that the presence of defect states in two-dimensional organic-inorganic lead halide perovskites can affect nonlinear optical phenomena, with degenerate four-wave mixing used to detect defect energy levels. Quenching of two-photon luminescence as flake thickness increases is observed, indicating the potential for detecting defect energy levels in crystals using this technique.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Eric T. Chang, Gabrielle Koknat, Garrett C. McKeown Wessler, Yi Yao, Volker Blum, David B. Mitzi
Summary: Recently, researchers have discovered the potential of bournonite (CuPbSbS3) as a ferroelectric photovoltaic (PV) material with a band gap of 1.3 eV. Studies have shown successful thin-film processing of bournonite, achieving a power conversion efficiency of 2.65% for a bournonite-based PV device. In this study, the solid-state synthesis of selenium-alloyed bournonite, CuPbSb(S1-xSex)3, was investigated across the entire range of x (0.0 <= x <= 1.0), and phase purity was reported for 0.0 <= x <= 0.5. Characterization of the samples revealed a decrease in band gap from 1.25 eV at x = 0.0 to 1.06 eV at x = 0.5.
CHEMISTRY OF MATERIALS
(2023)
Review
Chemistry, Physical
Osbel Almora, Derya Baran, Guillermo C. Bazan, Carlos I. Cabrera, Sule Erten-Ela, Karen Forberich, Fei Guo, Jens Hauch, Anita W. Y. Ho-Baillie, T. Jesper Jacobsson, Rene A. J. Janssen, Thomas Kirchartz, Nikos Kopidakis, Maria A. Loi, Richard R. Lunt, Xavier Mathew, Michael D. McGehee, Jie Min, David B. Mitzi, Mohammad K. Nazeeruddin, Jenny Nelson, Ana F. Nogueira, Ulrich W. Paetzold, Barry P. Rand, Uwe Rau, Henry J. Snaith, Eva Unger, Lidice Vaillant-Roca, Chenchen Yang, Hin-Lap Yip, Christoph J. Brabec
Summary: This article summarizes the best achievements in the performance of emerging photovoltaic devices in various research subjects, as reported in peer-reviewed articles since August 2021. The article provides updated graphs, tables, and analyses of performance parameters, and compares them based on the photovoltaic bandgap energy and average visible transmittance. The scope of the report is expanded to include triple junction solar cells.
ADVANCED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Yongshin Kim, Hannes Hempel, Thomas Unold, David B. B. Mitzi
Summary: This study investigates the effects of Ag substitution on the properties of Ag-incorporated CBGTSe, including phase stability, crystal structure, film morphology, grain structure, charge carrier properties, band positions, and charge carrier kinetics and recombination. It is found that up to 20% of Cu can be substituted by Ag in CBGTSe, and increasing Ag content leads to larger grain size and reduced hole carrier densities. However, Ag substitution has negligible impact on ionization potential, electron affinity, and carrier lifetimes. Solar cells based on different Ag/(Ag + Cu) ratios show comparable power conversion efficiencies.
Article
Chemistry, Multidisciplinary
Dovletgeldi Seyitliyev, Xixi Qin, Manoj K. Jana, Svenja M. Janke, Xiaowei Zhong, Wei You, David B. Mitzi, Volker Blum, Kenan Gundogdu
Summary: Electron-phonon interactions are shown to manipulate charge transfer in hybrid perovskites, using coherent phonon modes. The energy offset at the organic-inorganic interface oscillates periodically, providing a unique opportunity for the modulation of interfacial charge transfer. These observations demonstrate how electron-phonon interactions can be used to manipulate fundamental charge and energy transfer processes in hybrid perovskites.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Liang Yan, Camryn J. Gloor, Andrew M. Moran, Wei You
Summary: Low-dimensional organic/inorganic hybrid perovskites (OIHPs) combine the unique properties of organic molecules and inorganics, making them promising materials for optoelectronics and other applications. Non-covalent interactions, particularly p-effect interactions, have a significant impact on important properties of low-dimensional OIHPs including dielectric confinement, bandgap, photoluminescence, quantum efficiency, charge mobility, trap density, stability, and chirality. This perspective reviews recent studies on non-covalent interactions involving the p systems of organic cations in low-dimensional OIHPs, providing insight into understanding and engineering these interactions for specific applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Kyunghoon Kim, Eric Vetter, Liang Yan, Cong Yang, Ziqi Wang, Rui Sun, Yu Yang, Andrew H. Comstock, Xiao Li, Jun Zhou, Lifa Zhang, Wei You, Dali Sun, Jun Liu
Summary: Researchers have discovered that chiral phonons in non-magnetic materials can generate spin currents in response to a thermal gradient, without the need for ferromagnetic contacts. This finding suggests the potential application of chiral phonons in spin caloritronics and offers a new route for spin generation in the absence of magnetic materials.
Article
Materials Science, Multidisciplinary
Xiaowei Zhong, Tsung-Wei Chen, Liang Yan, Wei You
Summary: D18 and its derivatives are high-performance conjugated polymers for bulk heterojunction solar cells, with efficiency reaching 17% when paired with small molecule acceptors such as Y6 and its derivatives. However, the complex synthesis of the D18 series has limited its accessibility to the research community. In this study, we redesigned the synthetic scheme of D18, particularly the key monomer, and replaced difficult or low-yielding steps with simple and high-yielding reactions. The optimized synthesis of D18 series offers great synthetic tunability and will facilitate the design and synthesis of conjugated polymers for optoelectronics.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Physical
Zhenyu Ouyang, Zijian Gan, Liang Yan, Wei You, Andrew M. Moran
Summary: In this paper, the authors present an experimental approach combining diffractive optic-based transient grating spectroscopy with a two-pulse time-of-flight technique to simultaneously probe carrier drift and diffusion in the active layer of a photovoltaic cell.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yi Xie, Jack Morgenstein, Benjamin G. G. Bobay, Ruyi Song, Naidel A. M. S. Caturello, Peter C. C. Sercel, Volker Blum, David B. B. Mitzi
Summary: Cation mixing in 2D HOIP structures is an important factor for modifying organic templating effects and tailoring inorganic structures. In this study, a chiral-chiral mixed-cation system is demonstrated, where a small amount of chiral cation S-2-MeBA can be doped into S-BrMBA(2)PbI4 to modulate the structural symmetry. The concentration of S-2-MeBA determines the structural change from higher symmetry state (C2) to the lowest symmetry state (P1). Atomic occupancy analysis suggests that a specific S-BrMBA cation site is preferentially substituted by S-2-MeBA. The chiral cation doping system provides a material design strategy for enhancing emergent properties sensitive to symmetry breaking.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Polymer Science
Owen Reid Courtney, Samantha Marie Clouthier, Sebastien Perrier, Joji Tanaka, Wei You
Summary: We report a simple approach for end group functionalization of linear polymers and graft copolymers using an interchange process of reversible addition-fragmentation chain transfer (RAFT) polymerization chain transfer agents (CTAs). The high functional group tolerance of the RAFT process allows for the introduction of a library of functionalities. Additionally, this approach enables the simultaneous installation of multiple functional groups. Furthermore, we demonstrate the utility of the supernatant of the reaction mixture as an alternative to end group analysis.
Article
Materials Science, Multidisciplinary
Peter C. Sercel, Alexander L. Efros
Summary: We theoretically demonstrate that giant magnetic circular dichroism (MCD) can be observed in two-dimensional (2D) semiconductors with Rashba splitting and a perpendicular magnetic field. This phenomenon is reflected in the calculated absorption coefficients for transitions between Landau levels (LLs) of conduction and valence bands. The giant MCD signal is attributed to the unique magnetic field dependence of the lowest LL in the presence of the Rashba term. Another characteristic of Rashba splitting is a decrease in the exciton diamagnetic shift caused by the Rashba terms. The analysis of the exciton dispersion at nonzero momentum reveals mixed magneto-impulse terms resulting in a negative diamagnetic shift, which can be observed in the exciton photoluminescence.
Review
Chemistry, Multidisciplinary
Joji Tanaka, Jiajia Li, Samantha Marie Clouthier, Wei You
Summary: Reversible Addition-Fragmentation Chain Transfer (RAFT) step-growth polymerization is a novel method that combines the advantages of RAFT polymerization and step-growth polymerization. It uses bifunctional reagents to efficiently produce Single Monomer Unit Insertion (SUMI) adducts under stoichiometrically balanced conditions. This review provides a brief history of the RAFT-SUMI process, discusses various RAFT step-growth systems, and describes the characterization of molecular weight evolution based on the Flory model. The efficiency of the RAFT-SUMI process is also described using a formula assuming rapid chain transfer equilibrium.
CHEMICAL COMMUNICATIONS
(2023)
Article
Polymer Science
Parker T. Boeck, Joji Tanaka, Wei You, Brent S. Sumerlin, Adam S. Veige
Summary: The successful A(2) + B-2 RAFT step-growth polymerization of bis-acrylamides was demonstrated using a bifunctional trithiocarbonate chain transfer agent as the comonomer. Surprisingly, the typical homopropagation of acrylamides leading to branching and crosslinking was not observed. Additionally, the synthesized poly(acrylamides) can be degraded by simply adding excess ethanolamine or PBu3.
Article
Polymer Science
Samantha Marie Clouthier, Jiajia Li, Joji Tanaka, Wei You
Summary: We report a one-pot stimuli-responsive tandem degradation method for a graft copolymer with alternating backbone functionalities. Selective cleavage of structural repeat units in the main chain forms a well-defined polymeric species, and further cleavage of the second structural unit can 'cut' it in half. The high selectivity of these two orthogonal steps ensures that the order of stimuli does not affect the outcome.
