Article
Chemistry, Physical
Rafael Besse, Han Wang, Damien West, Juarez L. F. De Silva, Shengbai Zhang
Summary: Understanding the dynamics of charge transfer at vertical heterostructures of transition metal dichalcogenide monolayers is crucial for future technological applications. In this study, a different mechanism from type-II is found in the MoS2/PtSe2 van der Waals heterobilayer, where the phonon bottleneck effectively separates photoelectrons from photoholes, providing a new direction for effective charge separation at interfaces.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Ning Zhang, Huili Li, Bo Yao, Shiyan Liu, Jun Ren, Yawei Wang, Zebo Fang, Rong Wu, Shunhang Wei
Summary: Construction of a heterojunction between quantum dots and TiO2 nanowire arrays via electrostatic self-assembly is rarely reported. In this work, the surface potential of WO3 quantum dots and TiO2 nanowire arrays was changed using mercury lamp irradiation, resulting in WO3 quantum dots tightly attached to the TiO2 nanowire surface through electrostatic self-assembly. Photoelectrochemical measurements showed that the WO3 quantum dots formed a type II heterojunction with the TiO2 nanowire arrays, greatly improving the contribution of the WO3 quantum dots to the photocurrent. The self-assembled system exhibited excellent photoelectrochemical stability and significantly enhanced photocurrent density compared to the TiO2 nanowire arrays.
DALTON TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Sarbajaya Kundu, David Senechal
Summary: The study investigates the effect of local repulsive interaction on a Weyl semimetal model, revealing a continuous transition from a gapless phase to a gapped spin density wave phase at a critical interaction strength. Introducing a finite tilt in the linear dispersion in a type-II Weyl semimetal model diminishes the critical interaction strength, indicating higher susceptibility towards interactions. The behavior of various physical quantities associated with Weyl nodes in both semimetallic and magnetically ordered states is examined.
Article
Optics
E. Rostampour
Summary: In this study, the transmission probability of a triple quantum well triple barrier structure was investigated using the propagation matrix method for InAs/GaSb type-II superlattice. The effects of different barriers and wells widths, as well as wells geometry, on the transmission coefficient were independently studied. It was found that the variation of material composition of barriers in a specified structure can affect the tunneling effect.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jingjie Lai, Lijun Ding, Cunhao Fan, Jie Wei, Jing Qian, Kun Wang
Summary: A novel method was developed to prepare surface zinc vacancies in ZnO nanorod arrays, which exhibit high electron-hole separation efficiency and excellent photoelectrochemical performance, making them a promising candidate for the next generation of organic photoelectrochemical transistor aptasensors.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Takuya Kanetomo, Zhen Ni, Masaya Enomoto
Summary: A novel hydrogen-bonded metal-organic framework was prepared and showed asymmetric thermal hysteresis behavior with a 4-fold interpenetrating diamond framework.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Shohei Kumagai, Takefumi Yoshida, Hiroaki Iguchi, Masanori Wakizaka, Nobuto Funakoshi, Masahiro Yamashita, Shinya Takaishi
Summary: The electronic states of iodo-bridged platinum nanowire complexes were investigated using polarized FT-IR spectroscopy. The N-H symmetrical stretching mode was found to be highly sensitive to the electronic states, distinguishing between mixed-valence (MV) and averaged-valence (AV) states. The first Pt(iii) nanowire complexes were synthesized by applying chemical pressure to the counter-anions.
CHEMICAL COMMUNICATIONS
(2023)
Article
Physics, Applied
Yuee Xie, Yujiao Kang, Siwen Li, Xiaohong Yan, Yuanping Chen
Summary: The research proposes a method to achieve phase transition between type-I and type-II Dirac semimetals in 2D materials by tuning external strains. Two 2D nanosheets were identified through first-principles calculations to confirm the mechanism. Additionally, a possible routine for synthesizing the new 2D structures was proposed.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
David Z. Ting, Alexander Soibel, Arezou Khoshakhlagh, Anita M. Fisher, Brian J. Pepper, Sam A. Keo, Cory J. Hill, Sir B. Rafol, Sarath D. Gunapala
Summary: This article describes the challenges for long- and very long-wavelength InAs/InAsSb type-II strained-layer superlattice infrared detectors, and provides an overview of progress in device architecture development for addressing them. The complementary barrier infrared detector (CBIRD) containing p-type InAs/InAsSb T2SLS absorbers is explored to enhance quantum efficiency and suppress surface shunt current.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
M. Salis, J. P. Lorenz, Y. K. Huang, A. de Visser
Summary: We report a doping study aimed at intentionally inducing disorder in PdTe2. Two single-crystalline batches of Pd1-xPtxTe2 with nominal doping concentrations of x = 0.05 and x = 0.10 were prepared. Characterization of the samples using energy dispersive X-ray spectroscopy showed that Pt did not dissolve homogeneously in the crystals. Magnetic and heat capacity measurements revealed a transition from type-I to type-II superconducting behavior with increasing disorder. Transport measurements indicated that a residual resistivity of ρ0 = 1.4 μS2 cm is sufficient to turn PdTe2 into a superconductor of the second kind.
Article
Instruments & Instrumentation
David Z. Ting, Sir B. Rafol, Sam A. Keo, Arezou Khoshakhlagh, Alexander Soibel, Anita Fisher, Cory J. Hill, Brian J. Pepper, Sarath D. Gunapala, Steven C. Allen, Darrel Endres, Robert A. Jones, Yajun Wei, Diane Beamer
Summary: This paper explores the potential of InAs/InAsSb type-II superlattice long wavelength infrared detectors for NASA land imaging applications. CBIRD focal plane arrays with p-type and a combination of p-type and n-type superlattice absorbers have demonstrated good operability and uniformity using both conventional and silicon-on-silicon processes.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Dhafer Alshahrani, Manoj Kesaria, Juan J. Jimenez, Dominic Kwan, Vibha Srivastava, Marie Delmas, Francisco M. Morales, Baolai Liang, Diana Huffaker
Summary: Incorporating an intentional strain compensating InSb interface (IF) layer in InAs/GaSb type-II superlattices (T2SLs) enhances device performance. But there is a lack of studies that correlate this approach's optical and structural quality, so the mechanisms by which this improvement is achieved remain unclear.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Subhadeep Paul, Paramita Kundu, Paturu Kondaiah, Akhil R. Chakravarty
Summary: A series of multichromophoric ruthenium(II) complexes have been prepared and characterized for their potential use in cancer therapy as phototherapeutic and photodetection agents. The complexes exhibit strong absorbance and high singlet oxygen sensitization ability, with complex 4 showing high photocytotoxicity in cancer cells. The emission property of the complexes is utilized for cellular imaging, making them promising next-generation theranostic PDT agents.
INORGANIC CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Min Baik, Ji-hoon Kyhm, Hang-Kyu Kang, Kwang-Sik Jeong, Jong Su Kim, Mann-Ho Cho, Jin Dong Song
Summary: The study reported the growth mechanism and optical characteristics of type-II band-aligned GaSb quantum dots on GaAs using molecular beam epitaxy, demonstrating a self-aligned type-II band alignment and a high internal quantum efficiency.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Dongting Zhang, Tian Le, Baijiang Lv, Lichang Yin, Chufan Chen, Zhiyong Nie, Dajun Su, Huiqiu Yuan, Zhu-An Xu, Xin Lu
Summary: In this study, mechanical point-contact spectroscopy was conducted on single crystalline NbGe2 with a superconducting transition temperature Tc = 2.0-2.1 K. The results suggest that NbGe2 may undergo a transition from a type-I to type-II (possible type-II/1) superconductor at low temperatures.
Article
Energy & Fuels
Ludong Li, Yurui Wang, Xiaoyu Wang, Renxing Lin, Xin Luo, Zhou Liu, Kun Zhou, Shaobing Xiong, Qinye Bao, Gang Chen, Yuxi Tian, Yu Deng, Ke Xiao, Jinlong Wu, Makhsud I. Saidaminov, Hongzhen Lin, Chang-Qi Ma, Zhisheng Zhao, Yingju Wu, Lijun Zhang, Hairen Tan
Summary: Lightweight flexible perovskite solar cells have great potential for various applications, but their efficiency lags behind rigid solar cells. In this study, a self-assembled monolayer bridged hole-selective contact with reduced defects and improved bending durability was developed, resulting in a certified efficiency of 24.4% for flexible all-perovskite tandem solar cells.
Article
Optics
Rayhani Jawher, Mehrez Oueslati, Vincent Sallet, Jean-Christophe Harmand, Radhwen Chtourou
Summary: Temperature-dependent photoluminescence measurements were performed on self-assembled InAs quantum dots grown by molecular beam epitaxy. Non-monotonic evolutions of the PL spectral parameters as a function of temperature were observed in the low-temperature regime. The anomalous increase in the integrated intensity and sigmoidal variation of the PL peak energy with increasing temperature were attributed to the optical emission from deep states in the quantum dots. A rate equation model successfully described the evolution of the integrated PL intensity with temperature, providing insight into the thermally activated intra-dot redistribution of carriers.
JOURNAL OF LUMINESCENCE
(2023)
Article
Physics, Condensed Matter
Agatha C. Ulibarri, Rishabh Kothari, Alejandro Garcia, Jean-Christophe Harmand, Sangjun Park, Fabian Cadiz, Yves Lassailly, Jacques Peretti, Alistair C. H. Rowe
Summary: A systematic study was conducted on the spin-dependent recombination (SDR) in dilute nitride alloys of GaAs1-xNx as a function of nitrogen content. The results showed that the density of electronically active defects and the SDR process increase with increasing nitrogen content, emphasizing the importance of including nonspin-dependent recombination channels in a complete model of SDR.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Physical
Heyong Wang, Zhan Chen, Fuyu Tian, Guanhaojie Zheng, Hongguang Wang, Tiankai Zhang, Jiajun Qin, Xingyu Gao, Peter A. van Aken, Lijun Zhang, Xiao-Ke Liu, Feng Gao
Summary: A strong correlation between lattice strain in perovskite films and the stability of PeLEDs is revealed in this study. The lifetime of high-efficiency PeLEDs is optimized by tailoring the lattice strain. The study also indicates that the degradation of the local perovskite lattice structure could be a degradation mechanism for long-term stable PeLEDs.
ADVANCED ENERGY MATERIALS
(2023)
Article
Physics, Applied
Shu-Yu Wen, Li He, Yuan-Hao Zhu, Jun-Wei Luo
Summary: We investigated the recrystallization behavior of bubble-rich amorphous germanium (a-Ge) containing argon (Ar) using conventional furnace annealing (FA) and excimer laser annealing (ELA). We found that ELA effectively suppresses the Ar bubbles and allows for good recrystallization of a-Ge, while FA only achieves partial recrystallization with many defects. Transmission electron microscopy results showed that ELA can transform the damaged layer induced by Ar implantation into a fully crystalline matrix with a low density of isolated bubbles. Our findings reveal the crucial role of Ar bubbles in the recrystallization behavior of a-Ge, offering a new approach to suppress implantation-induced gas bubbles in semiconductors for high-quality regrowth.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Daniele Barettin, Igor V. Shtrom, Rodion R. Reznik, Sergey V. Mikushev, George E. Cirlin, Matthias Auf der Maur, Nika Akopian
Summary: We conducted a study on Wurtzite AlGaAs using both experimental and numerical methods, and found that it is a technologically promising yet unexplored material. By developing a complete numerical model based on an 8-band (k) over right arrow center dot(p) over right arrow method, including electromechanical fields, we calculated the optoelectronic properties of wurtzite AlGaAs nanowires with different Al content and compared them with experimental data. Our results strongly indicate that wurtzite AlGaAs is a direct band gap material. Additionally, we numerically obtained the band gap of wurtzite AlAs and the valence band offset between AlAs and GaAs in the wurtzite symmetry.
Article
Chemistry, Multidisciplinary
Huanxin Guo, Xiaoyu Wang, Chengjie Li, Honglong Hu, Huidong Zhang, Lijun Zhang, Wei-Hong Zhu, Yongzhen Wu
Summary: A supramolecular strategy involving surface anion complexation with Calix[4]pyrrole (C[4]P) is reported for enhancing the stability of perovskite solar cells. The C[4]P-stabilized perovskite films demonstrated increased light and thermal stability, and showed preservation of their morphology even after ageing at high temperatures and under humid conditions. The use of C[4]P resulted in significant improvement in the lifespan and efficiency of the perovskite solar cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wenjin Yu, Mingyang Wei, Zhenyu Tang, Hongshuai Zou, Liang Li, Yu Zou, Shuang Yang, Yunkun Wang, Yuqing Zhang, Xiangdong Li, Haoqing Guo, Cuncun Wu, Bo Qu, Yunan Gao, Guowei Lu, Shufeng Wang, Zhijian Chen, Zhiwei Liu, Huanping Zhou, Bin Wei, Yingjie Liao, Lijun Zhang, Yan Li, Qihuang Gong, Edward H. H. Sargent, Lixin Xiao
Summary: A new synthetic approach is developed to improve the LED performance of perovskite nanocrystals. By introducing a bifunctional carboxylic-acid-containing ammonium hydrobromide ligand, the crystallization process of perovskite nanocrystals can be controlled, leading to improved photoluminescence quantum yield. Green LEDs fabricated using this method even outperform traditional perovskite nanocrystal-based LED devices.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yilin Zhang, Huimin Mu, Yuxin Cai, Xiaoyu Wang, Kun Zhou, Fuyu Tian, Yuhao Fu, Lijun Zhang
Summary: We developed an algorithm for identifying and characterizing the connection patterns of structural units in open-framework structures and constructed a descriptor set for the thermal expansion properties of this system, which is composed of connectivity and elemental information. Our developed descriptor, aided by machine learning (ML) algorithms, can effectively learn the thermal expansion behavior in small sample datasets collected from literature-reported experimental data (246 samples). Our results demonstrate that developing effective descriptors closely related to thermal expansion properties enables ML models to make accurate predictions even on small sample datasets, providing a new perspective for understanding the relationship between connectivity and thermal expansion properties in the open framework structure.
Article
Chemistry, Physical
Yilin Zhang, Yuanhui Sun, Huimin Mu, Hongshuai Zou, Fuyu Tian, Yuhao Fu, Lijun Zhang
Summary: Two-dimensional layered materials have potential applications in miniaturized devices, but thermal management issues, such as thermal mismatch and thermal stress, can degrade device performance. In this study, we propose two new descriptors, the axial elastic deviation factor sigma i and the axial net thermal stress fi, to evaluate the thermal expansion behavior of layered materials. Based on the analysis of these descriptors, we found in-plane negative thermal expansion in PtS2 (-1.2 ppm/K) and PtSe2 (-0.8 ppm/K), considering their elastic property. Our work provides a unified understanding of the thermal expansion causes in layered materials and can guide the screening of thermal expansion materials and subsequent device design.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Bangyu Xing, Dandan Sang, Xueting Wang, Hongdong Li, Lijun Zhang
Summary: Surface charge transfer doping (SCTD) is an alternative approach to achieve n-type doped diamonds. However, efficient diamond n-type SCTD has not been achieved so far. In this study, first-principles calculations were used to comprehensively investigate the n-type SCTD of diamond. Methyl viologen and benzyl viologen were found to provide the largest amount of transferred electrons among common n-type SCTD dopants for the oxygen and fluorine terminated (100) surface diamond.
Article
Physics, Multidisciplinary
Wen-Hao Liu, Yu-Xiang Gu, Zhi Wang, Shu-Shen Li, Lin -Wang Wang, Jun-Wei Luo
Summary: In contrast to conventional charge density wave (CDW) materials, the one-dimensional CDW on the In/Si(111) surface quickly dampens during the photoinduced phase transition. By using real-time time-dependent density functional theory (rt-TDDFT) simulations, we successfully reproduced the experimental observation of the photoinduced CDW transition on the In/Si(111) surface. Our findings show that photoexcitation leads to the generation of interatomic forces, causing a structural transition through the shortening of long In-In bonds. After the transition, a switch in the In-In bonds leads to a rotation of interatomic forces, rapidly damping the oscillations in CDW modes.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Shuo Zhang, Fangyuan Ye, Xiaoyu Wang, Rui Chen, Huidong Zhang, Liqing Zhan, Xianyuan Jiang, Yawen Li, Xiaoyu Ji, Shuaijun Liu, Miaojie Yu, Furong Yu, Yilin Zhang, Ruihan Wu, Zonghao Liu, Zhijun Ning, Dieter Neher, Liyuan Han, Yuze Lin, He Tian, Wei Chen, Martin Stolterfoht, Lijun Zhang, Wei-Hong Zhu, Yongzhen Wu
Summary: In this study, an amphiphilic molecular hole transporter with a multifunctional cyanovinyl phosphonic acid group was used to deposit a superwetting underlayer for perovskite deposition. This enabled the formation of high-quality perovskite films with minimized defects at the buried interface. The resulting perovskite film showed excellent photoluminescence properties and achieved a certified PCE of 25.4%, demonstrating its potential for application in solar cells.
Article
Multidisciplinary Sciences
Yurui Wang, Renxing Lin, Xiaoyu Wang, Chenshuaiyu Liu, Yameen Ahmed, Zilong Huang, Zhibin Zhang, Hongjiang Li, Mei Zhang, Yuan Gao, Haowen Luo, Pu Wu, Han Gao, Xuntian Zheng, Manya Li, Zhou Liu, Wenchi Kong, Ludong Li, Kaihui Liu, Makhsud I. Saidaminov, Lijun Zhang, Hairen Tan
Summary: By reversing the processing order and using a substrate configuration, the authors bury the oxidizable narrow-bandgap perovskites in all-perovskite tandem solar cells, resulting in an efficient and stable device with an efficiency of 25.3%.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Wenhao Liu, Haowen Liu, Zhi Wang, Shushen Li, Linwang Wang, Junwei Luo
Summary: This Perspective discusses recent advancements in understanding ultrafast processes in photoinduced structural phase transitions and proposes a strategy for precise manipulation of such transitions. It has been demonstrated that photoexcited carriers occupying specific bonding or antibonding states can induce atomic motions and lead to structural transitions. Based on this understanding, an inverse design protocol for achieving or preventing target structural transitions is proposed. Overall, this Perspective provides a comprehensive overview of recent advancements in dynamical structural control in solid materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
