Article
Materials Science, Multidisciplinary
Deren Li, Xi Zhang, Wenjie He, Yong Peng, Gang Xiang
Summary: In this paper, transition-metal (TM = V, Cr, Mn, Fe, Co and Ni)-doped GeSe thin films with high-temperature ferromagnetism (FM) were fabricated by solid-source chemical vapor deposition (CVD). It was found that Mn-, Fe- and Co-doped GeSe films exhibited robust FM with high Curie temperatures and relatively high hole concentrations. Further analysis indicated that the enhanced ferromagnetism in these films was attributed to the carrier-enhanced Ruderman-Kittel-Kasuya-Yosida interaction. This study provides insights into TM-doped GeSe diluted magnetic semiconductor thin films.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shivaji M. Sonawane, Shweta Chaure, Nandu B. Chaure
Summary: In this study, polycrystalline, stoichiometric, and compact antimony telluride (Sb2Te3) thin films were successfully deposited using the wet-chemical aqueous electrochemical technique. The growth potential was optimized through cyclic voltammetric measurements, and the structural, morphological, compositional, and electrical properties of the films were characterized. The obtained Sb2Te3 thin films showed promising potential for application in CdTe-based solar cells.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Moustafa Ahmed, Ahmed Bakry, Essam R. Shaaban
Summary: This study synthesized (In1-xCrx)(2)O-3 powders and thin films with different Cr doping concentrations using chemical reactions and investigated the effects of Cr concentration on the structure and optical properties of In(2)O(3 )layers. The results showed a blue shift in the optical band gap with increasing Cr doping concentration, indicating the potential for tunability in the structural and optical properties of the thin films.
Article
Materials Science, Multidisciplinary
K. B. Tsiberkin
Summary: This paper presents a theoretical analysis of magnetization waves in a diluted magnetic semiconductor, deriving a dynamical equation system describing the evolution of magnetization in the paramagnetic matrix and magnetic admixture ions. Two possible solutions were considered: a stable travelling wave with finite amplitude in a ferromagnetic coupling system, and a solitary wave where the soliton amplitude and velocity were determined by interactions between ions and the base matrix. The dipolar coupling between the matrix and admixture ions significantly influenced wave stability.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Syed Mansoor Ali, S. Aldawood, M. S. AlGarawi, S. S. AlGhamdi, H. Kassim, A. Aziz
Summary: The induced effects of gamma rays on the properties of Bi2S3 thin films synthesized using SILAR have been studied. It was found that the crystallite size and energy band gap decreased with increasing gamma radiation dose, while the optical transmission and emission characteristics of the irradiated films improved.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Energy & Fuels
Maryam Heidariramsheh, Sevan Gharabeiki, Seyed Mohammad Mahdavi, Nima Taghavinia
Summary: This work focused on spray pyrolysis deposition of Cu2SnS3 (CTS) thin films using a stable basic solution. The study investigated the impact of parameters such as substrate temperature and copper concentration on the structural, optical, and electrical properties of the deposited thin films. XRD and Raman analysis confirmed the formation of pure CTS films, and optical studies indicated a band gap between 1.08 and 1.2 eV for different Cu/Sn ratios.
Article
Materials Science, Multidisciplinary
Jabeen Abbasi, Sudhir Regmi, Arunava Gupta
Summary: The magnetic chromium-based chalcogenide spinel system has unique electrical, magnetic, and optical properties, making it an interesting field of study. We have successfully deposited Cd(1-x)CuxCr2S4 thin films using a chemical spray deposition method, allowing for the manipulation of the magnetic and optical properties through composition changes.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Zhongkai Cheng, Deirdre M. O'Carroll
Summary: Photon recycling is crucial in the study of semiconductor materials, impacting their optoelectronic applications; however, further in-depth theoretical and experimental studies are needed to demonstrate its advantages and importance rigorously.
Article
Chemistry, Physical
Zhongguo Li, Zhendong Wu, Xiaolong Wang, Hongtao Cao, Lingyan Liang, Junyi Yang, Yinglin Song
Summary: The study demonstrates the fabrication of amorphous zinc tin oxide thin films with strong visible light absorption using rf magnetron sputtering and rapid postannealing. The ultrafast carrier dynamics of the ternary films were investigated using femtosecond transient absorption spectroscopy, revealing that visible light absorption is induced by band gap reduction rather than defect states in the ZTO film. These findings shed light on the photophysical mechanism of amorphous ZTO films and suggest their potential use in solar cell and photodetector devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Jiafei Li, Xi Zhang, Jiating Lu, Wa He, Ya Nie, Yong Peng, Gang Xiang
Summary: Fe-doped SiGe (Si0.25Ge0.75:Fe-x, x = 0.01, 0.025, and 0.05) thin films were prepared and investigated for their structural, magnetic, and magneto-transport properties. The obtained samples were polycrystalline with lattice constants increasing with Fe concentration. Fe dopants primarily existed as substitutional Fe2+ ions in the SiGe lattice, providing local magnetic moments and hole carriers. The samples exhibited ferromagnetism, with a Curie temperature up to 294 K, a giant magnetoresistance (GMR) effect of over 800%, an anomalous Hall effect (AHE), and semiconducting behaviors. The hole-mediated process originating from substitutional Fe dopants and the tensile strain in the films contributed to the observed ferromagnetism. The synthesis and high-temperature ferromagnetism of Fe-doped SiGe thin films hold potential for spintronic applications based on group IV materials.
Article
Materials Science, Ceramics
Su Yeon Cha, Dongwoo Kim, Hojoon Lim, Bongjin Simon Mun, Do Young Noh, Hyon Chol Kang
Summary: The study focused on the synthesis and characterization of non-stoichiometric Ga2O3-x thin films deposited on sapphire substrates using radio-frequency powder sputtering. The thin films were found to have electronic states mainly consisting of Ga3+ and Ga1+, exhibiting semiconductor electrical characteristics.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Qian Li, Weiqing Yan, Heng Yuan, Shunian Chen, Bin Liao, Minju Ying
Summary: The present study reports room temperature ferromagnetism observed in Co implanted, Er implanted and (Co, Er) co-implanted ZnO films deposited by filtered cathode vacuum arc (FCVA) on sapphire substrates. The electrical properties and magnetic properties of the doped ZnO films were improved, and significant intrinsic ferromagnetism was observed. The results can provide a reference for preparing high-quality diluted magnetic semiconductors (DMSs) by co-doping RE elements and TM elements in ZnO films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Muhammad Sheraz Khan, Bingsuo Zou, Li-Jie Shi, Shangfei Yao, Arfan Bukhtiar, WeiGuo Huang, Yang Lu, JiaJun Cao, Biling Zheng
Summary: Using Density Functional Theory (DFT), we investigated the opto-electronic and magnetic properties of Mn(II)-doped ZnTe thin films. The occupation of spin-up Mn-ta levels in the absence of additional carriers leads to a super-exchange mechanism. We studied the effect of additional p-type doping on the ferromagnetism and found that the coupling of hole carriers with spin-up Mn-states stabilizes ferromagnetism in the Mn(II)-doped ZnTe thin films. Additionally, Mn(II) doping widens ZnTe's bandgap and produces spin-forbidden d-d transition peaks, while p-type defects in the doped films improve the absorption efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
V. O. Anyanwu, M. K. Moodley
Summary: Aluminium doped with zinc oxide (98 wt %) (AZO) thin films were fabricated on glass substrates using pulsed laser deposition (PLD) technique, showing nanoscale structures and morphology. The deposition was performed at chosen substrate temperatures and low partial pressure. A laser energy density of 4 J/cm2 was utilized, which effectively ablated the bulk AZO and minimized droplets arrival on the substrates. The AZO films exhibited crystallite sizes ranging from 31.1 to 45.4 nm, and the lowest resistivity was achieved at 6.8 x 10-5 ohm cm with an average optical transmittance of 83% in the UV-vis-NIR region. The PLD technique provides a significant avenue for crack-free and reliable thin film growth with improved electrical and optical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Amit Chanda, Deepika Rani, Derick Detellem, Noha Alzahrani, Dario A. Arena, Sarath Witanachchi, Ratnamala Chatterjee, Manh-Huong Phan, Hariharan Srikanth
Summary: This study investigates the temperature-dependent anomalous Nernst effect (ANE) and longitudinal spin Seebeck effect (LSSE) in CoFeCrGa thin films grown on MgO substrates. The results show that the MgO/CoFeCrGa films have high ANE and LSSE coefficients at room temperature, with peaks observed as the temperature increases.
ACS APPLIED MATERIALS & INTERFACES
(2023)