Article
Multidisciplinary Sciences
Xuejian Ma, Fei Zhang, Zhaodong Chu, Ji Hao, Xihan Chen, Jiamin Quan, Zhiyuan Huang, Xiaoming Wang, Xiaoqin Li, Yanfa Yan, Kai Zhu, Keji Lai
Summary: The study directly probes the free-carrier dynamics in Cs-doped FAPbI(3) thin films using spatiotemporal photoconductivity imaging, revealing that the lifetimes of electrons and holes in the material are compensated by their disparate mobility, resulting in comparable long diffusion lengths for both carriers. This unique charge trapping and de-trapping processes in hybrid trihalide perovskites play a crucial role in determining the superior diffusion dynamics of the material, which is vital for solar-cell applications.
NATURE COMMUNICATIONS
(2021)
Article
Energy & Fuels
Yuhang Liang, Xiangyuan Cui, Feng Li, Catherine Stampfl, Simon P. Ringer, Jun Huang, Rongkun Zheng
Summary: It is demonstrated that hydrogen impurities incorporated in all-inorganic perovskite CsPbI3 can act as efficient nonradiative recombination centers, contributing to a higher nonradiative efficiency loss compared to native deep defects. Additionally, it is proposed that iodine-moderate growth conditions can effectively reduce detrimental hydrogen ions.
Article
Materials Science, Multidisciplinary
Bruno P. Falcao, Joaquim P. Leitao, Lidia Ricardo, Hugo Aguas, Rodrigo Martins, Rui N. Pereira
Summary: This study clarifies the dominant electron-hole recombination mechanisms and the origin of light emission in Si-NPs with different forms of surface passivation. The research shows that at low excitation powers, recombination of photo-carriers is dominated by monomolecular channels via defect states, while at high excitation powers, electron-hole bimolecular recombination dominates. The sensitivity of H-terminated Si-NPs to photo-oxidation and its consequences for Si-NP applications are discussed, with photo-oxidation described within the Cabrera-Mott chemical reactions theory.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Multidisciplinary
Shunhong Dong, Zhi-Yi Hu, Ping Wei, Jingru Han, Zhao Wang, Jing Liu, Bao-Lian Su, Dongyuan Zhao, Yong Liu
Summary: This study reports the engineering of surface structure to tune the optoelectronic properties of halide perovskites. Uniform all-inorganic CsPbBr3 cubic/tetrahedral single-crystals with precise control of (100) and (111) surface anisotropy were designed and fabricated. The (100) surface engineering enables a lowest surface bandgap energy and high-rate carrier mobility, while the (111) surface enhances surface-defects-catalyzed reactions.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Thomas Defferriere, Dino Klotz, Juan Carlos Gonzalez-Rosillo, Jennifer L. M. Rupp, Harry L. Tuller
Summary: The study shows that grain boundary resistance in solid ionic conductors can be decreased by illuminating with above-bandgap light. Experimental results demonstrate the increase in grain boundary conductance of a 3 mol% Gd-doped ceria thin film by approximately 3.5 times at 250 degrees C, with the reduction of activation energy from 1.12 to 0.68 eV under illumination. The discovered opto-ionic effect could potentially contribute to the development of new electrochemical storage and conversion technologies, as well as fast and contactless control or diagnosis of ionic conduction in polycrystalline solids.
Article
Materials Science, Multidisciplinary
Javier del Valle, Rodolfo Rocco, Claribel Dominguez, Jennifer Fowlie, Stefano Gariglio, Marcelo J. Rozenberg, Jean-Marc Triscone
Summary: The study investigates the electrically induced insulator-to-metal transition in rare-earth nickelates by comparing the time-dependent transport properties of two distinct members. Stark differences in the nucleation and growth of the metallic phase were observed, with NdNiO3 evolving more rapidly. The amplitude of the resistivity change across the transition was identified as the key parameter controlling the switching speed, contributing to a unified vision of the field-induced transition dynamics across correlated oxides families.
Article
Chemistry, Multidisciplinary
Meng-Jia Sun, Randy Sabatini, Pei-Xi Wang, Amin Morteza Najarian, Koen Bertens, Andrew Johnston, Sjoerd Hoogland, Edward H. Sargent
Summary: The study investigates the influence of ion migration on the EO efficiency of mixed halide perovskites, finding that ion migration affects the experimental results of the mixed samples, leading to increased frequency dependence.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Songcheng Hu, Zhenhua Tang, Li Zhang, Dijie Yao, Zhigang Liu, Siming Zeng, Xiaobin Guo, Yanping Jiang, Xin-Gui Tang, Lin Ma, Zhaogang Nie, Ju Gao
Summary: This study prepared double perovskite oxide Bi2FeCrO6 (BFCO) thin films using the sol-gel method and investigated their structural, optical, and electrical properties. It was found that light could induce optical modulation conversion of RS behavior and a negative differential resistance (NDR) effect in Au/BFCO/FTO devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Aditya Mishra, Michael A. Hope, Gabriele Stevanato, Dominik J. Kubicki, Lyndon Emsley
Summary: Researchers studied cesium lead chloride and found that metal-ion DNP provides the highest bulk sensitivity in this case, while highly surface-selective NMR spectra can be acquired using impregnation DNP. The performance of both methods is explained in terms of the relaxation times, particle size, dopant concentration, and surface wettability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Biochemistry & Molecular Biology
Abdelfattah Darwish, Naglaa Salem El-Sayed, Sherief A. Al Kiey, Samir Kamel, Gamal Turky
Summary: This study investigates the dielectric behavior of a polyanionic electrically conductive superabsorbent hydrogel based on sodium alginate-g-poly(AM-co-ECA-co-AMPS) using broadband dielectric spectroscopy (BDS). It reveals that the dielectric spectra show three distinctive processes: electrode polarization, charge carrier's transport, and a molecular relaxation process. The effects of temperature and reduced graphene oxide (rGO) content are analyzed, and the results suggest the potential application of the hydrogel in forms of energy storage such as supercapacitors. The composite hydrogel with 2.5% rGO content exhibits excellent electrochemical capabilities.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Energy & Fuels
Zhongle Zeng, Xiangyu Chen, Yunfan Yue, Sheng Li, Nianyao Chai, Bo Mai, Jiaqi Meng, Yi-Bing Cheng, Xuewen Wang
Summary: Perovskite solar cells have developed rapidly in the past decade, but their poor stability remains a challenge for commercialization. This study focuses on the changes in the absorption spectra of 2D Dion-Jacobson (D-J) perovskite under continuous light illumination. The results show enhanced absorption intensity near the band edge, indicating the production of additional absorbing species. The study also confirms the transformation of D-J perovskite into 3D alpha-FAPbI(3), delta-FAPbI(3), and PbI2 after illumination, providing insights into the degradation mechanism and stability improvement of 2D D-J perovskite materials.
Article
Engineering, Electrical & Electronic
Garrett C. Thomas, D. D. L. Chung
Summary: This paper presents the first report on the dielectric behavior of electrically conductive metal-particle thick films, which impedes electrical conduction. The experiment reveals that the silver thick film has a high relative permittivity but low DC resistivity, and the inter-particle interfaces in the thick film promote carrier-atom interaction.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Feng Zhang, Zhou Mi, Weizhong Hao, Hualong Chen, Yule Zhang, Jinjin Zhao, Guozhong Cao, Han Zhang
Summary: The past decade has seen significant advancements in photovoltaic technology using organometal halide perovskites, due to their low recombination loss, long carrier lifetime, and diffusion length. These perovskite-based photovoltaic devices offer excellent optical properties and easy preparation, allowing for a wide range of applications in electro-optical and opto-electrical conversions. This review discusses the photoinduced free carriers, exciton recombination, and diffusion properties of perovskite photoelectronic devices, and explores methods of controlling their dynamics through grain size control, defect suppression, and interfacial charge transfer. The review also examines the generality and differences in effective carriers for device applications, and highlights the nonlinear effects enabled by strong light-matter interactions in all-optical devices, such as high-resolution imaging and optical modulation.
SCIENCE CHINA-MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yixuan Gao, Xiao Su, Jiangwei Zhang, Hongwei Tan, Jianghui Sun, Jin Ouyang, Na Na
Summary: Water-resistant PQDs were prepared through electrospray synthesis, achieving Zn substitution with Pb to form new Zn-OVs structure for catalyzing photocatalytic N-2 reduction reaction without sacrificial agents being added.
Article
Chemistry, Multidisciplinary
Shubhi Bansal, Yutaka Tokuda, Jonathon Peasley, Sriram Subramanian
Summary: This study explores the three-dimensional bouncing phenomenon of liquid metal droplets and compares the bouncing trajectories under different driving parameters. The results show that the jumping height of the droplets increases with the decrease in voltage frequency and the increase in amplitude, offering new opportunities for applications such as energy harvesting, heat transfer, and radio frequency switching utilizing liquid metal droplet operations.
Article
Engineering, Electrical & Electronic
Junchi Yu, Feifan Xu, Tao Tao, Bin Liu, Bin Wang, Yimeng Sang, Shihao Liang, Yang Chen, Meixin Feng, Zhe Zhuang, Zili Xie, Xiaojuan Sun, Youdou Zheng, Kai Huang, Rong Zhang
Summary: In this study, a GaN-based transparent single-color Micro-LED display chip was designed on a double-side polished sapphire substrate. It has high transparency and brightness, providing promising application prospects in augmented reality and smart glasses.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Biomedical
Zehui Wang, Kun Cao, Di Yan, Yangjing Ge, Ruiyuan Li, Yanwen Liu, Ting Ma, Xiaojuan Sun
Summary: This study developed a biomimetic membrane that combines bFGF and RGD with collagen membrane using the principle of layer-by-layer self-assembly. The biomimetic membrane showed strong biocompatibility and promoted soft tissue healing. The results demonstrated that the biomimetic membrane actively stimulated wound healing and had positive effects on cell activity, proliferation, and migration, mainly through activating the Wnt/beta-catenin signaling pathway.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2023)
Article
Physics, Multidisciplinary
Xianjun Wang, Ke Jiang, Xiaojuan Sun, Zi-Hui Zhang, Yuxuan Chen, Bingxiang Wang, Dabing Li
Summary: The profiles of the valence subbands in an AlGaN-based quantum well are studied, considering quantum confinement effect and strain. Increasing the quantum confinement effect and compressive strain raises the relative position of the heavy hole subband to the crystal field splitting hole subband in the valence band. However, the underlying mechanisms of the modulation by the quantum confinement effect and strain are different. In addition, if the energy level between the heavy hole and crystal field splitting hole subbands is close, the subband anti-crossing effect enhances their coupling and leads to dipole moment transformation between the conduction and valence subbands. These findings have important implications for the design of AlGaN-based optoelectronic devices with short wavelength, high carrier injection, or monolithic integration.
Article
Nanoscience & Nanotechnology
Yang Chen, Zhiming Shi, Shanli Zhang, Yuanyuan Yue, Hang Zang, Jianwei Ben, Ke Jiang, Yuping Jia, Xiaojuan Sun, Dabing Li
Summary: This study demonstrates the control of interfacial adhesion in III-nitride van der Waals epitaxy (vdWE) by using graded high-temperature nitridation treatment of the graphene insertion layer. Different epitaxial modes were achieved based on the adhesion difference, and the quasi-vdWE enabled by small graphene defects and proper N doping showed the lowest formation energy for AlN nucleation. The successful transfer of III-nitride onto a flexible substrate using a UV resin-assisted bonding technique allows for the fabrication of a flexible photodetector with high device yield and excellent performance after bending cycles. This work offers a promising strategy for controlling vdWE interfacial adhesion and enables the development of future UV foldable and wearable devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Fajuan Tian, Jiawen Yu, Wen Wang, Dianbo Zhao, Jie Cao, Qi Zhao, Fucheng Wang, Hanjun Yang, Zhixin Wu, Jingkun Xu, Baoyang Lu
Summary: By using a simple two-step electropolymerization method, we have developed an adhesive and long-term stable conducting polymer neural interface that shows excellent adhesion to metallic electrodes. This interface can potentially serve as a powerful tool for advanced neuroscience research and cutting-edge clinical applications like brain-controlled intelligence.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Optics
Boyang Liu, Zhenghui Liu, Gengzhao Xu, Wentao Song, Chunyu Zhang, Kebei Chen, Sha Han, Xiaojuan Sun, Dabing Li, Ke Xu
Summary: AlGaN is an important material for deep ultraviolet optoelectronic devices and electronic devices. The phase separation on the AlGaN surface, which results in small-scale compositional fluctuations of Al, can degrade the performance of devices. By utilizing the scanning diffusion microscopy method, the Al0.3Ga0.7N wafer was studied to investigate the mechanism of surface phase separation. The results demonstrate that scanning diffusion microscopy is an effective method to analyze the micro-mechanism of AlGaN phase separation.
Article
Optics
Nianlei Jiang, Yang Chen, Bingchen Lv, Ke Jiang, Shanli Zhang, Shunpeng Lu, Shaojuan Li, Tao Tao, Xiaojuan Sun, Dabing Li
Summary: This study designs a graphene/Al nanoparticles/graphene (Gra/Al NPs/Gra) hybrid plasmonic structure to enhance the light extraction efficiency (LEE) of AlGaN-based deep ultraviolet light-emitting diodes (DUV LED). The optimization of dewetting process and charge transfer between graphene and Al NPs contribute to the enhanced near-field coupling of Gra/Al NPs/Gra. The proposed mechanism suggests that Gra/metal NPs/Gra can improve the performance of optoelectronic devices, promoting the development of high brightness and power density LEDs and lasers.
Article
Physics, Multidisciplinary
Hang Zang, Zhiming Shi, Mingrui Liu, Yuping Jia, Ke Jiang, Jianwei Ben, Yang Chen, Shunpeng Lv, Xiaojuan Sun, Dabing Li
Summary: In this study, the atomic structure of Al1-xScxN and its effect on its piezoelectric and ferroelectric properties were investigated using first-principles calculations. It was found that Al1-xScxN with a phase separation feature was more stable than the corresponding wurtzite structure. The piezoelectric response of Al1-xScxN depended strongly on the atomic arrangements, with different structures exhibiting positive and negative piezoelectric coefficients.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Polymer Science
Wen Wang, Jie Cao, Jiawen Yu, Fajuan Tian, Xiaoyu Luo, Yiting Hao, Jiyan Huang, Fucheng Wang, Weiqiang Zhou, Jingkun Xu, Ximei Liu, Hanjun Yang
Summary: Supercapacitors, known for their high power density, fast charging and discharging speeds, and long service life, are widely used in various fields. However, the integration of supercapacitors in flexible electronics faces challenges regarding extensibility, bending stability, and operability. To address these challenges, we deposited thiophene and 3-methylthiophene on patterned 304 stainless steel through electropolymerization to prepare stretchable conducting polymer electrodes. Moreover, the cycling stability of the electrodes was improved by protecting them with a poly(vinyl alcohol)/sulfuric acid gel electrolyte. The assembled flexible supercapacitors exhibited 93% stability even after 10,000 cycles of strain, highlighting their potential applications in flexible electronics.
Article
Materials Science, Multidisciplinary
Chunru Fan, Xiaojuan Sun, Zhiming Shi, Bingchen Lu, Yang Chen, Shaojuan Li, Jia-Ming Liu
Summary: In this work, a wafer-scale graphene-Au nanogratings (Gra-Au NGs) plasmonic photodetector array is fabricated via two-beam holographic lithography, which achieves a photosensitive area of 1 mm(2), showing balanced abilities of polarization-sensitive, broadband, and enhanced photoresponse from visible to near-infrared regions.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Neurosciences
Ming Liu, Xiaojuan Sun
Summary: In this study, a multi-compartmental model of fast-spiking basket cells (FS BCs) was constructed to investigate their responses to different spatial dispersion of synaptic inputs. It was found that supralinear dendrites dominate somatic firing, while sublinear dendrites prefer dispersing. It was also revealed that dendritic diameter and Ca2+-permeable AMPA conductance play important roles in this process, while A-type K+ channels and NMDA conductance have little effect. These findings provide valuable insights into dendritic computation.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Optics
Xuqing Sun, Hongyao Liu, Liwen Jiang, Ruxue Wei, Chang Wang, Xue Wang, Xiaojuan Sun, Fei Wang, Xinchao Lu, Andrey B. Evlyukhin, Chengjun Huang
Summary: Directionally scattered surface plasmon polaritons (SPPs) have been achieved in low-index dielectric nanoparticles, enhancing the efficiency of plasmonic devices. The excitation mechanism of plasmonic induced electric and magnetic multipole modes and their contributions to the forward scattering of SPPs are numerically illustrated and experimentally visualized.
PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Hang Zang, Zhiming Shi, Jianwei Ben, Ke Jiang, Yang Chen, Shanli Zhang, Mingrui Liu, Tong Wu, Yuping Jia, Xiaojuan Sun, Dabing Li
Summary: III-nitride materials like AlN, GaN, and InN have promising applications in the semiconductor industry, but the high defect densities resulting from the growth process can impact device performance. In this study, a first-principles investigation was conducted to understand the growth and electronic properties of stacking mismatch boundaries (SMBs) in III-nitride materials. The study revealed that SMBs can be categorized into three types based on the terrace edge of the coalescent normal and stacking-fault regions, and the type can be controlled by varying the chemical potential and initial nucleation size during growth. It was also found that SMBs produce in-gap states with various properties, such as itinerant magnetism and optical transition.
Article
Chemistry, Multidisciplinary
Yuxuan Chen, Ke Jiang, Xiaojuan Sun, Zi-Hui Zhang, Shanli Zhang, Jianwei Ben, Bingxiang Wang, Long Guo, Dabing Li
Summary: We proposed an alternative strategy to optimize the metal/n-AlGaN contact by introducing a heterostructure with a polarization effect and by etching a recess structure through the heterostructure beneath the n-contact metal. This strategy could simultaneously decrease the Schottky barrier height as well as provide a better carrier transport channel, enhancing both the thermionic emission and tunneling processes. This investigation provides an alternative approach to obtain a good n-contact, especially for Al-rich AlGaN-based devices, such as diodes and LEDs.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Xiaojuan Sun, Jiaen Sui, Jianwei Ben, Hang Zang, Ke Jiang, Shanli Zhang, Shunpeng Lv, Zhiming Shi, Tong Wu, Dabing Li
Summary: This study investigates the underlying mechanism of the decrease in basal stacking fault density in a nonpolar AlN template. It is found that the elimination of the I-1-type stacking fault involves its transformation into an I-3-type stacking fault, followed by annihilation. The results presented here are significant for the synthesis of high-quality nonpolar AlN materials and nonpolar light-emitting diodes.
Article
Materials Science, Multidisciplinary
Jinfei Dai, Chenjing Zhao, Jie Xu, Hossein Roshan, Hua Dong, Francesco Di Stasio, Fang Yuan, Bo Jiao, Zhaoxin Wu
Summary: In this study, the performance of perovskite nanocrystal light emitting diodes (PNC-LEDs) was enhanced through rational device structure design and the application of high-performance perovskite nanocrystal emitting layers.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Jia-Hua Yeh, Suhendro Purbo Prakoso, Leon Lukhas Santoso, Shi-Ju Chen, Bryan Chiang, Ju-Chieh Cheng, Ru-Ning Zhang, Yu-Cheng Chiu
Summary: This study demonstrates the application of a renewable material called dextrin-SMS in the production of electret filters and transistor memory. Dextrin-SMS material can maintain prolonged electrostatic charges and has a relatively wide memory window, making it suitable for the production of biodegradable face masks and green electronics.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Ahmad Telfah, Qais M. Al-Bataineh, Ahmad A. Ahmad, Rund Abu-Zurayk, Carlos J. Tavares, Johannes Etzkorn, Farzad Foadian
Summary: Polyacrylic acid complexed with polyaniline (PAA/PANI) composite materials have the potential to form organic mixed ion-electron conductive (OMIEC) films, which can be used in optoelectronic and energy storage applications. The composite films are formed through an acid-base reaction, resulting in strong electrostatic interactions and intermolecular hydrogen bonds between PANI and PAA. The separation of PANI-rich domains from PAA-rich matrix in the composite films is observed. The electrical conductivity of the composite films is higher when the content of PANI is 33 wt%, due to the high ionic-electronic coupling at the interface between phase-separated regions.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Min-Chih Hou, Dian Luo, Yu-Ting Huang, Shun-Wei Liu, Chin-Wei Lu, Chih-Hao Chang, Hai-Ching Su
Summary: Light-emitting electrochemical cells (LECs) have great potential for novel emission applications, but their relatively low device efficiency hinders their competitiveness with other emission technologies. A study finds that increasing the concentration of small TiO2 nano-particles in the diffuser film can enhance light extraction and improve the device efficiency of LECs.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Qiaoli Niu, Yao Xu, Jun Yang, Wei Hua, Baoxiang Chai, Zequan Zhang, Yuhui Ma, Wenjin Zeng, Ana Flavia Nogueira, Ruidong Xia
Summary: By introducing CPB as a defect passivation agent in the perovskite precursor solution, the optoelectronic properties of perovskite films can be significantly improved and non-radiative carrier recombination can be effectively suppressed. CPB-modified perovskite solar cells exhibit lower trap-state density and stronger carrier migration capability, leading to enhanced power conversion efficiency and stability.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Hulya Ozturk Dogan, Fatma Yildirim, Zeynep Orhan, Ali Ben Ahmed, Mostefa Benhaliliba, Sakir Aydogan
Summary: In this study, efficient self-powered visible and UV photodetectors based on hybrid organic-inorganic materials were demonstrated. The photodetectors showed excellent UV detecting capability and good photoresponsivity.
ORGANIC ELECTRONICS
(2024)
