Article
Chemistry, Physical
Jessica M. de la Perrelle, Andrew Dolan, Emily R. Milsom, Thomas D. Small, Gregory F. Metha, Xun Pan, Mats R. Andersson, David M. Huang, Tak W. Kee
Summary: This study reports the use of blend nanoparticles of PM6 and Y6 for photocatalytic hydrogen production. The results show that free charge generation through hole transfer contributes significantly to hydrogen evolution even when Y6 is exclusively excited, while the rate drops when PM6 is preferentially excited.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Lan-Anh T. Nguyen, Krishna P. Dhakal, Yuhan Lee, Wooseon Choi, Tuan Dung Nguyen, Chengyun Hong, Dinh Hoa Luong, Young-Min Kim, Jeongyong Kim, Myeongwon Lee, Taeyoung Choi, Andreas J. Heinrich, Ji-Hee Kim, Donghun Lee, Dinh Loc Duong, Young Hee Lee
Summary: The study reveals an anomalous circularly polarized photoluminescence phenomenon in V-doped two-dimensional transition metal dichalcogenides, which is caused by the coupling of excitons with V-induced spin-polarized holes.
Article
Materials Science, Multidisciplinary
Ishtiaque Ahmed Navid, Ayush Pandey, Yin Min Goh, Jonathan Schwartz, Robert Hovden, Zetian Mi
Summary: Conventional semiconducting nanowire optoelectronic devices can improve efficiency by using deep-nanoregime semiconducting structures. GaN-based micro-network nanostructures grown on Si wafers exhibit ultrabright emission in the visible spectrum and significantly reduce surface recombination velocity compared to conventional InGaN nanowire structures.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Jian Wang, Xiaohao Jia, Yalu Guan, Kuankuan Ren, Haichao Yu, Zhijie Wang, Shengchun Qu, Qingxin Yang, Jie Lin, Zhanguo Wang, Peng Jin
Summary: This study compared plasmonic lasers and photonic counterparts based on CH3NH3PbBr3 perovskite nanowires, and found that they have the same gain origination. The results show that an electron-hole plasma contributes to both types of lasing actions from perovskite nanowires at room temperature.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Physical
Dongki Lee, Jaewon Lee, Dong Hun Sin, Se Gyo Han, Hansol Lee, Wookjin Choi, Hyojung Kim, Jaebum Noh, Jungho Mun, Woong Sung, Sang Woo Kim, Byeong Geun Jeong, Sung Hyuk Kim, Junsuk Rho, Mun Seok Jeong, Kilwon Cho
Summary: We studied the charge-generation mechanism in low-bandgap polymer-fullerene bulk heterojunction organic solar cells using transient absorption spectroscopy. We found that the highly crystalline nanowire structure of the blend film prepared with chlorobenzene and 1,8-diiodooctane induced more long-lived charge carriers. The intrachain ordering of the polymer in the blend film increased the charge-transfer state lifetime and improved the efficiency of the solar cells.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Giovanni Marini, Matteo Calandra
Summary: The constrained density-functional perturbation theory scheme is proposed for calculating structural and harmonic vibrational properties of insulators in the presence of an excited and thermalized electron-hole plasma. The method is ideal for controlling ultrafast light-induced structural transitions and can detect reversible transient phases and irreversible structural transitions induced by ultrafast light absorption.
Article
Materials Science, Multidisciplinary
K. Moratis, J. Cibert, D. Ferrand, Y-M Niquet
Summary: The study explores the effects of built-in strain on the heavy hole, light hole, and exciton states in lattice-mismatched ellipsoidal quantum dots situated inside nanowires. The results show that the built-in axial strain not only determines the character of the ground state but also significantly mixes the light hole state with split-off band states.
Article
Materials Science, Multidisciplinary
Junheng Pan, Sheng Liu, Jau Tang
Summary: The study focuses on the ultrafast transport processes of electrons and holes excited by femtosecond laser pulses, shedding light on carrier dynamics in semiconductors. Transient optical techniques and ultrafast scanning electron microscopy are utilized to investigate carrier excitation and transport. The research also elucidates the ballistic dynamics of hot carriers near a p-n junction.
Article
Polymer Science
Yin Wu, Zicheng Ding, Qiang Zhang, Xiao Liang, Hua Yang, Wenliang Huang, Yueling Su, Yi Zhang, Hanlin Hu, Yanchun Han, Shengzhong Frank Liu, Kui Zhao
Summary: In this study, we successfully increased the H-aggregates and improved the hole mobility of a printed diketopyrrolopyrrole-based polymer film by selectively modulating the side chain aggregation in the solution state and backbone aggregation during film formation. This work not only provides a promising route towards high-mobility printed conjugated polymer films but also reveals the important relationship between assembly pathways and film microstructure.
Article
Chemistry, Physical
Kyra N. Schwarz, Valerie D. Mitchell, Saeed-Uz-Zaman Khan, Calvin Lee, Adam Reinhold, Trevor A. Smith, Kenneth P. Ghiggino, David J. Jones, Barry P. Rand, Gregory D. Scholes
Summary: The morphology of organic semiconductors plays a critical role in the function of optoelectronic devices, especially in donor-acceptor mixtures within organic solar cells. Energy landscapes are shown to drive charge accumulation away from interfaces, forming large electric fields, similar to a capacitor. Adjusting annealing conditions affects domain purity and electro-absorption, demonstrating the importance of energy landscapes in shaping charge movement and the necessity of pure domains for reduced recombination and large electric fields.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Peng Zhou, Ishtiaque Ahmed Navid, Yongjin Ma, Yixin Xiao, Ping Wang, Zhengwei Ye, Baowen Zhou, Kai Sun, Zetian Mi
Summary: Production of hydrogen fuel from sunlight and water is a promising pathway for carbon neutrality. A strategy using pure water, concentrated solar light, and an indium gallium nitride photocatalyst has achieved a solar-to-hydrogen efficiency of 9.2%. The strategy promotes forward hydrogen-oxygen evolution and inhibits reverse hydrogen-oxygen recombination by operating at an optimal reaction temperature, which can be achieved by harvesting infrared light in sunlight.
Article
Nanoscience & Nanotechnology
A. Cros, A. Garcia Cristobal, K. Hestroffer, B. Daudin, J. Wang, F. Demangeot, R. Pechou
Summary: Analysis of electron-phonon coupling in GaN/AlN core-shell nanowires using Raman scattering excited at various UV wavelengths revealed different vibration modes of phonons under different excitations. The thickness of the AlN shell can be adjusted to tune the energy and character of the electronic bands in these nanowires.
Article
Materials Science, Ceramics
Wenhuan Liu, Pinjing Xu, Huimei Zhu
Summary: In this study, Bi12GeO20/Ag3PO4 nanowire composite exhibited significantly improved photocatalytic performance and stability, with a RhB dye decomposition efficiency reaching 94.2%. The presence of Ag3PO4 was found to enhance the generation of active species and increase the active surface area, leading to the improved photocatalytic performance.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Condensed Matter
Nguyen Nhu Dat, Nguyen Thi Thuc Hien
Summary: The dielectric response function of the electron system in a cylindrical semiconductor quantum wire embedded in a dielectric material is derived. The study shows that the dielectric mismatch strongly influences the collective excitations of the electron system and the electrostatic interaction between charged particles in the wire. The results are important for improving impurity-limited electron mobility and selecting the appropriate potential barrier model.
EUROPEAN PHYSICAL JOURNAL B
(2022)
Article
Chemistry, Physical
Jinlu He, Yonghao Zhu, Weihai Fang, Run Long
Summary: By introducing perylene diimide into metal halide perovskite system, a midgap state is created that can rapidly capture photogenerated electrons, avoiding the formation of superoxide and enhancing stability. This fast electron trapping is due to strong nonadiabatic coupling and a small energy gap between the PDI midgap state and the perovskite conduction band minimum.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Jianguo Sun, Bin Li, Long Hu, Junjun Guo, Xufeng Ling, Xuliang Zhang, Chi Zhang, Xianxin Wu, Hehe Huang, Chenxu Han, Xinfeng Liu, Youyong Li, Shujuan Huang, Tom Wu, Jianyu Yuan, Wanli Ma
Summary: Solution processable semiconductors like organics and emerging lead halide perovskites (LHPs) are ideal candidates for photovoltaics. This study investigates a novel device architecture involving block copolymer/perovskite hybrid bulk heterointerfaces, which enhances light absorption, energy level cascade, and provides a thin hydrophobic layer to improve carrier generation and prevent moisture invasion. The resulting hybrid solar cell exhibits high efficiency and stability, and the approach can be extended to other LHPs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Rui Duan, Zitong Zhang, Lian Xiao, Tianhua Ren, Xuehong Zhou, Yi Tian Thung, Van Duong Ta, Jun Yang, Handong Sun
Summary: In this study, a new oscillation mode, dome-shaped mode (DSM), is discovered in liquid crystal (LC) microlasers. These LC soft-matter microlasers achieve a record high Q-factor over 24,000. Proof-of-concept demonstration of red, green, blue (RGB) LC-DSM microlaser pixels with a 74% broader achievable color gamut than the standard RGB color space is successfully presented. Additionally, the proposed LC-DSM microlaser shows excellent potential in ultra-high sensitivity detection with a low detection limit of 0.5 ppm for acetone vapor molecules.
CHEMICAL COMMUNICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Uma V. Ghorpade, Mahesh P. Suryawanshi, Martin A. Green, Tom Wu, Xiaojing Hao, Kevin M. Ryan
Summary: This review provides an overview of the development of versatile chalcohalide materials, focusing on their design, synthesis, optoelectronic properties, and applications in energy conversion and storage devices. Computational techniques, theoretical and experimental approaches are employed to understand the band structures, stability, and structural chemistry of these materials. The review also discusses the challenges and future research directions in this field.
Article
Chemistry, Physical
Felix Leon, Chenfei Li, Javier F. Reynes, Varun K. Singh, Xiao Lian, How Chee Ong, Gavin Hum, Handong Sun, Felipe Garcia
Summary: A series of photoluminescent aluminum and indium complexes were successfully synthesised using an environmentally-benign mechanosynthesis strategy. These complexes, which can serve as viable alternatives to traditional noble metal-based complexes, offer the advantages of low environmental impact and enhanced energy efficiency.
FARADAY DISCUSSIONS
(2023)
Article
Nanoscience & Nanotechnology
Xingjie Lv, Guoliang Yuan, Tom Wu, Zhibo Yan, Ben Xu, Guanghua Liu, Jun-Ming Liu
Summary: This study investigates the four different lifetimes of photocarriers in MAPbI(3) single crystal, shedding light on the physical mechanisms and facilitating the design of novel electronics with halide perovskite semiconductors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Multidisciplinary Sciences
Weili Yu, Feng Li, Tao Huang, Wei Li, Tom Wu
Summary: Halide perovskite heterojunctions combine the properties of multi-dimensional perovskites and selected semiconductors, surpassing the limitations of a single component. This platform allows for material property tuning, discovery of interesting phenomena, and enables novel applications.
Article
Engineering, Electrical & Electronic
Xunming Zhang, Long Liu, Di Wang, Ruijun Lin, Heyong Yang, Xiaoxin Xu, Jianguo Yang, Guozhong Xing, Xiaoyong Xue, Xiaoyang Zeng
Summary: This paper proposes a compact spin-orbit torque magnetic random-access memory (SOT-MRAM) cell structure with high read performance for embedded nonvolatile memory (eNVM) applications. The memory cell is composed of one transistor, two Schottky diodes, two magnetic tunnel junctions (MTJs), and one shared heavy metal (HM) layer, which doubles the read sense margin and simplifies the write operation. The evaluations show that the proposed SOT-MRAM significantly improves the performance and reliability of the read operation, reduces the bit-cell area, power consumption, and write latency compared to other MRAM technologies.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Optics
Yi Tian Thung, Rui Duan, Emek G. Durmusoglu, Yichen He, Lian Xiao, Calvin Xiu Xian Lee, Wen Siang Lew, Lin Zhang, Hilmi Volkan Demir, Handong Sun
Summary: Colloidal quantum wells (CQWs) are a promising gain material for optical feedback due to their unique excitonic features from 1D confinement, but current integration methods result in low laser quality. To address this, a liquid-interface kinetically driven self-assembly method is proposed to coat ultrathin CQWs onto silica microsphere cavities, achieving high-quality microlasers with a Q-factor of 13,000 at room temperature. Stable single-mode lasing output is demonstrated through evanescent field coupling in a 2D-3D microcavity configuration, highlighting the potential for future miniaturized colloidal optoelectronic and photonic applications.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
X. I. A. O. L. I. N. Huang, S. I. Y. U. A. N. Jiang, B. I. A. O. Wu, R. A. N. Huo, X. U. E. F. E. N. G. Zhao, G. U. O. Z. H. O. N. G. Xing, S. H. I. B. I. N. G. Long, N. A. N. Gao
Summary: We present a novel magnetically tunable diffraction optical element (DOE) based on ultrathin ferromagnetic (FM) Pt/Co stacks. The anisotropy of the Pt/Co stacks is spatially modulated by irradiating them with Ar+ ions, enabling tuning of the DOEs through the magnetooptical effect induced by an external magnetic field. Experimental results demonstrate that a magnetic field can manipulate both the zeroth and first diffraction orders of the DOEs simultaneously, and this effect can be utilized to enhance or hide the image formed by the DOE. This study paves the way for the development of compact and high-precision DOEs with fast and robust tunability, enabling various applications across a wide spectrum range.
Article
Materials Science, Multidisciplinary
Shijia Cheng, Zhen Qiao, Zeng Wang, Lian Xiao, Subhasis Das, Yi Tian Thung, Zhiyi Yuan, Van Duong Ta, Weijun Fan, Yu-Cheng Chen, Handong Sun
Summary: Inorganic metal halide perovskites, such as CsPbX3, have gained significant interest for their potential in high-performance optoelectronic devices. A solid-state space-confined strategy was developed to grow CsPbBr3 films, overcoming the limitations of the liquid phase-based methods. The resulting CsPbBr3 films exhibited regular shapes and demonstrated effective laser functionalities under optical pumping.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Meiying Leng, Jinqi Wu, Kevin Dini, Jing Liu, Zehua Hu, Jiang Tang, Timothy C. H. Liew, Handong Sun, Rui Su, Qihua Xiong
Summary: Lead halide perovskites have made significant progress in high-efficiency light-emitting diodes (LEDs) and are ideal for strong exciton-photon coupling. However, achieving exotic phenomena such as polariton lasing and polariton LEDs in perovskite electroluminescent microcavities at room temperature remains a challenge. In this study, we demonstrate room-temperature strong coupling in a perovskite LED structure, with the best device exhibiting a current efficiency of 4.5 cd/A and an external quantum efficiency of 1.4% with anticrossing behavior via optical pumping. Our approach offers a new strategy for exploring ultrafast LEDs and electrically pumped perovskite lasing.
Article
Multidisciplinary Sciences
Jinqi Wu, Sanjib Ghosh, Yusong Gan, Ying Shi, Subhaskar Mandal, Handong Sun, Baile Zhang, Timothy C. H. Liew, Rui Su, Qihua Xiong
Summary: Unlike conventional lasers, topological lasers can emit coherent light in the presence of disorders and defects due to their nontrivial band topology. Exciton polariton topological lasers, which have the unique property of not requiring population inversion, are a promising platform for low-power consumption. In this study, we experimentally demonstrate the realization of topological corner states and achieve polariton corner state lasing with a low threshold at room temperature using a perovskite polariton system. This achievement opens up possibilities for on-chip active polaritonics using higher-order topology.
Article
Chemistry, Multidisciplinary
Biaohong Huang, Xuefeng Zhao, Xiaoqi Li, Lingli Li, Zhongshuai Xie, Di Wang, Dingshuai Feng, Yuxuan Jiang, Jingyan Liu, Yizhuo Li, Guoliang Yuan, Zheng Han, Tula R. Paudel, Guozhong Xing, Weijin Hu, Zhidong Zhang
Summary: In this study, the authors utilize the Schottky barrier at the metal/ferroelectric interface to control the self-polarization states of a ferroelectric thin film heterostructure. Through investigation and theoretical studies, they demonstrate that doping with Sm changes the concentration and distribution of oxygen vacancies, which alters the Schottky barrier and depolarization field, resulting in the evolution of the system from single domain to polydomain states. By engineering self-polarization, they also achieve significant improvement in the resistive switching behaviors of the ferroelectric diodes (FDs). This research provides insights into self-polarization and its impact on device performance, making FDs a competitive memristor candidate for neuromorphic computing.
Article
Automation & Control Systems
Tingting Miao, Bin Cui, Cungang Huang, Di Wang, Long Liu, Weikang Liu, Yongzhe Li, Ruiyue Chu, Xue Ren, Liang Liu, Bin Cheng, Guangjun Zhou, Hongwei Qin, Guozhong Xing, Jifan Hu
Summary: The construction of artificial synapse based on electric field-controlled ion migration is a promising approach for low-energy consumption intelligent devices, but imitating the complex synapse diversity of the biological system remains challenging. In this study, the reversible phase transition between insulating SrCoO2.5 and metallic SrCoO3 induced by ionic liquid gating and anisotropic dynamics of oxygen ion migration along the [110] crystal orientation are utilized. The crystal orientation-dependent ion migration and resulting metal-insulator transition provide an intriguing opportunity to build artificial synapses with different performances, such as excitatory or inhibitory characters, learning accuracy, and cooperation capability. This research not only sheds light on anisotropic ion migration in oxides but also lays a foundation for the development of diverse oxide-based artificial neural networks.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Review
Materials Science, Multidisciplinary
Dawei Duan, Chuangye Ge, Md Zahidur Rahaman, Chun-Ho Lin, Yumeng Shi, Haoran Lin, Hanlin Hu, Tom Wu
Summary: Metal halide perovskites are easy to synthesize and have tunable physical properties and excellent performance, making them important optoelectronic materials. One-dimensional (1D) nanostructures at both the morphological and molecular levels enhance the performance of optoelectronic devices. Recent progress in the synthesis and characterization of 1D halide perovskites with tunable structures, compositions, and properties, as well as their applications in photovoltaics, light emission, and photodetection, is highlighted. Current challenges, future prospects, and promising research directions are discussed to advance the field of 1D perovskites.
NPG ASIA MATERIALS
(2023)
