Article
Chemistry, Physical
Luigi Santamaria, Pasqualino Maddalena, Stefano Lettieri
Summary: In this study, the time-resolved photoluminescence of zinc oxide crystals was analyzed. It was found that within a certain range of laser excitation, the process could be accurately described using second-order kinetics. A new method for data analysis was proposed, which provided information on fundamental physical quantities.
Article
Chemistry, Multidisciplinary
Sargis P. Gavalajyan, Grigor A. Mantashian, Gor Ts. Kharatyan, Hayk A. Sarkisyan, Paytsar A. Mantashyan, Sotirios Baskoutas, David B. Hayrapetyan
Summary: The exciton states in a conical GaAs quantum dot were studied using the effective mass approximation and the finite element method. The dependence of the exciton energy on the geometrical parameters of the dot was investigated. The exciton energy, effective band gap, lifetime, Raman scattering, interband light absorption, and photoluminescence spectra were calculated for different sizes of GaAs quantum dots.
Article
Chemistry, Multidisciplinary
Chaochao Qin, Zhinan Jiang, Zhongpo Zhou, Yufang Liu, Yuhai Jiang
Summary: The study on ultrafast dynamics of CsPbBr3 nanocrystals reveals that increasing excitation energy leads to longer Auger recombination lifetime but shorter hot-carriers cooling time, providing valuable insights for applications like solar cells and light-emitting devices.
Letter
Chemistry, Multidisciplinary
Jia-Min Lai, Muhammad Umair Farooq, Yu-Jia Sun, Ping-Heng Tan, Jun Zhang
Summary: The multiphonon process is crucial for understanding the electron-phonon coupling in solids, which affects their optical and transport properties. This study investigates the characteristics of high-order Raman scattering and hot luminescence in Mn-doped ZnO nanowires to shed light on the multiphonon-involved decay process of excited states, providing insights for further studies on the statistical characteristics of excited state decay.
Article
Nanoscience & Nanotechnology
Chaochao Qin, Zhinan Jiang, Zhongpo Zhou, Yufang Liu, Yuhai Jiang
Summary: This study investigates the ultrafast dynamics of CsPbBr3 nanocrystals using ultrafast time-resolved transient absorption spectroscopy. The findings show the impact of pump fluence on multiexcitons Auger recombination lifetime and hot carrier cooling time, as well as the influence of lattice temperature on the relaxation process of hot carriers.
Article
Nanoscience & Nanotechnology
Avisek Dutta, Amani Saleh Almutairi, Jojo P. Joseph, Alexander Baev, Athos Petrou, Hao Zeng, Paras N. Prasad
Summary: Transition-metal-doped semiconductor nanocrystals, particularly two-dimensional materials, have attracted significant attention due to their useful optical and magnetic properties. In this study, we investigate the magnetic and magneto-optic properties of copper-doped CdSe nanoplatelets synthesized using a high-temperature colloidal technique. Our results show that doped nanoplatelets exhibit more prominent excitonic features compared to undoped nanoplatelets at cryogenic temperatures. Furthermore, the study provides a detailed analysis of the magneto-optical behavior of doped nanoplatelets in the presence of paramagnetic copper ions.
Article
Chemistry, Multidisciplinary
Benjamin T. Diroll, James P. Cassidy, Dulanjan Harankahage, Muchuan Hua, Xiao-Min Lin, Mikhail Zamkov
Summary: This study investigates the two-photon properties of colloidal quantum shells, specifically the CdS/CdSe/CdS quantum shell samples. The results show that these quantum shells exhibit large non-linear absorption cross-sections and advantageous multiexciton physics. They have potential applications in upconversion imaging and can be utilized as excellent gain media for two-photon excitation. Additionally, quantum shell solids support multimodal amplified spontaneous emission due to their broad gain bandwidth and long gain lifetime.
Article
Chemistry, Inorganic & Nuclear
Hong Huang, Rong Sun, Xiao-Fan Wu, Youchao Liu, Jun-Zheng Zhan, Bing-Wu Wang, Song Gao
Summary: A new pair of multifunctional Zn(II)-Dy(III) enantiomers, based on chiral Schiff-base ligands, were synthesized and characterized. Magnetic studies showed that one of the enantiomers behaves as a single-molecule magnet. Both enantiomers exhibited chiroptical activity and circularly polarized luminescence in solution. The chiral Zn(II)-Dy(III) complexes also displayed magnetic circular dichroism signals at room temperature. These findings provide potential for the design of multifunctional molecular magnetic materials with circular polarization of luminescence activity and magneto-optic effects.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Sichao Du, Hao Xie, Juxin Yin, Yunlei Sun, Qiuting Wang, Hong Liu, Wei Qi, Chunfeng Cai, Gang Bi, Duo Xiao, Wenchao Chen, Xiaoyan Shen, Wen-Yan Yin, Rongkun Zheng
Summary: The capability of graphene to generate hot electrons is experimentally demonstrated in Bernal stacking sequence nano-graphite films, showing a strong correlation between the layer number and hot electron scattering. This enables the spectral coverage of hot electrons from mid-infrared to near-infrared energy levels, leading to a high density of populated hot electrons for mid-infrared photodetection. The thickness dependence electron thermalization property of the graphitic material provides a way to design ultrafast and sensitive mid-infrared photodetectors.
Article
Chemistry, Multidisciplinary
Weon Cheol Lim, Jitendra Pal Singh, Jonghan Song, Tae-Yeon Seong, Keun Hwa Chae
Summary: In this study, we systematically investigated the effects of various excitation processes on the properties of ZnO films. It was found that the highest dose of implantation had a significant impact on the properties, while lower doses showed insignificant changes. Both electronic excitation and nuclear excitation played a role in the changes of structural, optical, and magnetic properties of the implanted ZnO films.
Article
Nanoscience & Nanotechnology
Kazuhiro Tanaka, Masashi Kato
Summary: In this study, the recombination coefficients of 3C- and 6H-SiC were characterized and compared with those of 4H-SiC using the time-resolved free-carrier absorption measurement method. Recombination at the stacking faults in 4H-SiC cannot be considered as the intrinsic recombination of inclusions of other polytypes.
Article
Multidisciplinary Sciences
Carlos Trallero-Giner, Dario G. Santiago-Perez, Vladimir M. Fomin
Summary: Transition metal dichalcogenide (TMD) semiconductors are promising 2D materials for nano-optics and nano-optoelectronics. The influence of an external magnetic field on a TMD monolayer leads to magneto-polaron resonances (MPRs) involving optical phonons. The interaction between long-range Pekar-Frohlich (PF) and short-range deformation potential (DP) modifies the Landau energy levels, resulting in the splitting of avoided-crossing levels and the emergence of three excitation branches. This study provides guidance for magneto-optical experiments in TMDs, where three MPR peaks are expected to be observed.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Yongfu Ma, Han Gao, Ruiqin Huang, Renbo Guo, Sijie Yang, Yibo Han, Huakun Zuo
Summary: This study demonstrates the effective suppression and enhancement of green emission in ZnO through Fe and Mn doping. Temperature dependent PL spectra and magneto-PL reveal the influence of electron-dopant energy transfer and oxygen vacancy concentration on the green emission.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Pulimi Mahesh, Chittaranjan Nayak
Summary: The current study investigates the effect of disordered thickness and layer position on the optical absorption properties of a graphene-based photonic crystal in the THz frequency regime. The results show that varying the disorder strength and twisting unicells can lead to the formation of single or multiple narrow-band peaks. It is also found that highly disordered photonic structures with a single graphene layer can exhibit multiple narrow-band absorption peaks with high absorption. Additionally, twisting the dielectric layers and increasing structural disorderness can enhance the strength of single or multiple near-unity absorption peaks. The presence of magnetic fields influences the optical absorption of LCP and RCP waves, resulting in an increase in absorption peak bandwidth for LCP and a decrease for RCP.
Article
Chemistry, Multidisciplinary
Mher A. Mkrtchyan, David B. Hayrapetyan, Eduard M. Kazaryan, Hayk A. Sarkisyan, Maxim Ya. Vinnichenko, Vadim A. Shalygin, Dmitry A. Firsov, Lyudvig S. Petrosyan
Summary: This paper presents a theoretical investigation of interband and intraband transitions in an asymmetric biconvex lens-shaped quantum dot in the presence of an external magnetic field. Selection rules for intraband transitions are obtained and the behaviors of linear and nonlinear absorption and photoluminescence spectra are observed under different temperatures and magnetic field strengths. The study also examines the second and third harmonic generation coefficients as a function of photon energy in the absence and presence of an external magnetic field.
Article
Engineering, Electrical & Electronic
Nishi Mehak, Bindu Rani, Aadil Fayaz Wani, Shakeel Ahmad Khandy, Ajay Singh Verma, Atif Mossad Ali, M. A. Sayed, Shobhna Dhiman, Kulwinder Kaur
Summary: In this study, the electronic, structural, and thermoelectric properties of newly designed layered rare-earth metal germanide halides were investigated. The materials showed promising thermoelectric performance, making them suitable candidates for energy harvesting in thermoelectric applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Devidas I. Halge, Vijaykiran N. Narwade, Nabeel M. S. Kaawash, Pooja M. Khanzode, Sohel J. Shaikh, Jagdish W. Dadge, Prashant S. Alegaonkar, Rajeshkumar S. Hyam, Kashinath A. Bogle
Summary: This study presents the design and fabrication of a high-performance blue light photodetector using an n-type cadmium sulfide (CdS) thin film and a p-type polyaniline (PANI). The photodetector demonstrates exceptional performance characteristics, including high responsivity, detectivity, and sensitivity, along with rapid response time and rectification behavior. The research represents a significant advancement in the field of high-performance photodetectors.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Da Hu, Jiabin Lu, Qiusheng Yan, Yingrong Luo, Ziyuan Luo
Summary: This study introduces a chemical mechanical polishing technique based on metal electrochemical corrosion for single-crystal SiC to address the environmental pollution caused by the polishing solution in chemical mechanical polishing. Wear experiments were conducted to investigate the wear properties of SiC C-surface under different grinding ball materials and solutions. The proposed mechanism of material removal in single-crystal SiC via metal electrochemical corrosion was discussed.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Lifang Mei, Long Lin, Dongbing Yan, Yu Liang, Yu Wu, Shuixuan Chen
Summary: This paper investigates the removal of CuO particles from silicon wafer surfaces using a picosecond laser. Numerical calculations and experimental research were conducted, and a thermal-stress coupled finite element model was established. The results show that as the laser energy density increases, the removal rate of CuO particles initially increases and then decreases, while the roughness of the silicon substrate decreases and then increases.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Michihiro Yamada, Shuhei Kusumoto, Atsuya Yamada, Kentarou Sawano, Kohei Hamaya
Summary: In this study, we demonstrated the low-temperature growth of a Ge layer on a Co-based Heusler alloy via Sn doping, which improved the magnetic properties and spin signal.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Xiang-Long Wei, Bao-Feng Shan, Zong-Yan Zhao
Summary: This study synthesized and characterized a CuAlO2/CuGaO2 heterostructure and evaluated its photocatalytic performance. The heterostructure exhibited superior performance compared to individual CuAlO2 and CuGaO2 photocatalysts, with increased carrier concentration, enhanced redox capabilities, superior electrochemical stability, and reduced interfacial resistance. Photocatalytic experiments demonstrated the remarkable oxidation potential and notable reduction activity of the heterostructure, outperforming CuAlO2 and CuGaO2 in degradation rates and hydrogen production rates, respectively. These findings highlight the superior performance and broad applicability of the CuAlO2/CuGaO2 heterostructure in various photocatalytic reactions.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Micka Bah, Daniel Alquier, Marie Lesecq, Nicolas Defrance, Damien Valente, Thi Huong Ngo, Eric Frayssinet, Marc Portail, Jean-Claude De Jaeger, Yvon Cordier
Summary: This study investigates the AlN nucleation layer issue in GaN high frequency telecommunication and power switching systems fabricated after heteroepitaxy on Silicon or Silicon Carbide. It is shown that using 3C-SiC as an intermediate layer can significantly decrease RF propagation losses. Measurements and analyses demonstrate that dopant diffusion into the 3C-SiC pseudo-substrate is confined beneath the interface, and a slightly conductive zone is present beneath the AlN/3C-SiC interface, explaining the low propagation losses obtained for the devices. This work highlights the importance and efficiency of the 3C-SiC intermediate layer as a pseudo-substrate.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Shuang Wang, Lijun Wu, Zhiqing Wang, Ziyue Qian
Summary: The geometric structure and electrical properties of zigzag and armchair DWSiNT perfect tubes with different Stone-Wales defects were simulated using the SCC-DFTB method. It was found that the atomic arrangement, stability, energy gap, and charge distribution strongly depend on the type of tube. The effects of strong and weak electric fields on the tubes were also investigated, showing different impact on stability and energy gap. These findings have implications for future experimental studies.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Nanda Kumar Reddy Nallabala, Sunil Singh Kushvaha, Sambasivam Sangaraju, Venkata Krishnaiah Kummara
Summary: This study focuses on the preparation and performance of MIS-type high-k dielectric oxide-based UV photodetectors. The researchers found that the Au/Ta2O5/GaN devices prepared on Ta2O5/GaN heterojunction with post-annealing exhibited improved photoresponsivity, EQE, and rise/fall times. This improvement is attributed to the optimized band configuration of the Ta2O5/GaN heterostructure and the effect of post-annealing on photogenerated charge carriers.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Jean-Francois Michaud, Marc Portail, Daniel Alquier, Dominique Certon, Isabelle Dufour
Summary: This paper reviews the use of MEMS devices without sensitive layers in gas detection applications. These devices can measure a physical property of the gas to determine its concentration, and have the advantages of generality and high detection limits.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Kanyu Yang, Chaojie Shi, Ruizhao Tian, Haoyue Deng, Jie He, Yangyang Qi, Zhengchun Yang, Jinshi Zhao, Zhen Fan, Jun Liu
Summary: This study investigates the electrical and synaptic properties of Ag/TiO2 nanorod/FTO-based RRAM devices, focusing on the impact of different seed layer thicknesses on nanorod thickness and RRAM performance. The devices show remarkable achievements in terms of endurance, self-compliance, and resistance switching ratio. The switching mechanism is attributed to space-charge-limited conduction resulting from electron trapping in oxygen vacancy traps. The devices also maintain stable synaptic properties even after undergoing multiple cycles of long-term potentiation and depression.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Karthickraj Muthuramalingam, Wei-Chih Wang
Summary: This study presents a non-destructive approach using terahertz time-domain spectroscopy (THz-TDS) to estimate the electrical properties of semi-insulating compound semiconductors. The study successfully measures the resistivity and carrier concentration of semi-insulating Silicon Carbide (SiC) and Indium Phosphide (InP) wafers using THz-TDS in transmission mode. The simplified Drude model and the Nelder-Mead algorithm are employed to estimate the electrical properties, and the results are in accordance with the manufacturer specifications. The feasibility of non-destructive mapping of the electrical properties is demonstrated, offering a promising tomographic inspection approach for online monitoring.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Pengfei Wei, Rui Tong, Xiaofeng Liu, Yao Wei, Yongan Zhang, Xu Liu, Jian Dai, Haipeng Yin, Dongming Liu
Summary: This study investigates the influence of SiNx and SiOxNy as rear-side passivation films on the performance of PERC+ cells. SiNx film is found to have better passivation performance and resistance to aluminum paste erosion, while SiOxNy film exhibits better optical performance. By designing multi-layer SiNx/SiOxNy/SiNx stacks, the cells' efficiency and bifaciality are significantly improved.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Shuangting Ruan, Xiaolan Li, Wen Cui, Zhihui Zhang, Zhihui Xu, Huanqi Cao, Shougen Yin, Shishuai Sun
Summary: Integrating photosensitive electrode materials can effectively improve the low temperature tolerance and enhance energy density and power density. The surface morphology reconstruction technique can increase the active surface area and improve electrolyte contact, leading to higher specific capacity. Additionally, the electrodes demonstrate excellent photoelectric and photothermal conversion abilities, allowing the supercapacitor to maintain high energy density even at low temperatures.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Review
Engineering, Electrical & Electronic
Ashmalina Rahman, James Robert Jennings, Mohammad Mansoob Khan
Summary: This review provides a comprehensive overview of the synthesis and applications of nanostructured CuInS2 in photocatalytic applications. Various strategies, including the introduction of dopants, surface decoration, and heterojunction formation, have been summarized to improve the photocatalytic performance of CuInS2. However, scientific challenges such as the high carrier recombination rate limit the broad application of CuInS2.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)