Article
Multidisciplinary Sciences
S. A. Saleh
Summary: In this study, Ge-doped Sb65Se35-xGex alloys were prepared by the melt quenching method, and their microstructural and opto-electrical characteristics were investigated. The results showed that Ge-doped Sb65Se35 alloys have a small optical band gap in the visible region, making them suitable for optoelectronic data storage applications.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Akshayakumar Kompa, U. Chaitra, Dhananjaya Kekuda, Mohan K. Rao
Summary: The study explored the impact of dopant concentration and temperature on the structural, optical, and electrical properties of TiO2 thin films. It was found that the optical band gap varied with dopant concentration and annealing temperature, while electrical properties exhibited decreased resistivity and increased carrier density with increasing temperature or dopant concentration.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Ceramics
Aziz Nfissi, Mounir Belhajji, Abdelhak Chouiekh, Abdelilah Rjeb, Abdelfettah Barhdadi, Salaheddine Sayouri, Yahya Ababou
Summary: Cadmium oxide (CdO) thin films were successfully deposited on glass substrates by the sol-gel spin coating method. The effects of the annealing temperature and Zirconium (Zr) doping on the physical properties of the CdO thin films were investigated. It was found that 550 °C is the optimal annealing temperature with a good crystallinity for the CdO thin films. Then, by using this temperature, different Zr doping concentrations (0, 1, 3, 5 and 7%) were prepared at the same experimental conditions. The X-ray diffraction (XRD) patterns of all the as-prepared thin films showed a polycrystalline nature with a face centered cubic (FCC) structure and that Zr incorporated the sites of Cadmium (Cd) up to 3% concentration, while the excess Zr doping (x > 3%) aggregated at the grain boundaries of the CdO lattice. Scanning electron microscopy (SEM) analysis revealed homogeneous and dense grains distribution with a film thickness of 30 μm. The optical study showed an increase in optical transmittance of CdO with Zr doping up to 3% and then a decrease onwards within the same wavelength region. The optical band gap values increased from 2.41 to 2.67 eV with increasing Zr doping which was explained by the Burstein-Moss effect. The minimum electrical resistivity (5.32 x 10(-1) Ω·cm) was obtained for the film coated with 3% Zr using the four-probe method.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Israfil Sabikoglu
Summary: This study investigated the synthesis and luminescence characterization of Samarium (Sm3+) doped lithium metasilicate (Li2SiO3) phosphor ceramic. The results obtained on the luminescence and other optical studies were presented and discussed, including X-ray diffraction (XRD), optical absorption, and luminescence properties. The doping had no significant effect on the crystal structure, and the maximum photoluminescence (PL) emission was observed in the visible region. Complex peak structures were observed in the glow curves after irradiation, and a wide peak in the radioluminescence (RL) spectrum was attributed to silicate.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Physical
A. Ayana, Neelamma B. Gummagol, Parutagouda Shankaragouda Patil, U. K. Goutam, Pankaj Sharma, B. V. Rajendra
Summary: Nd3+ doped ZnO thin films were synthesized and characterized using the chemical spray pyrolysis technique. The Nd doping affected the morphology, crystal structure, optical properties, and carrier concentration of the films. Furthermore, defect-mediated energy transfer was observed from the photoluminescence spectra.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Seval Aksoy Pehlivanoglu, Ozgur Polat
Summary: ZnO and Ir-doped ZnO thin films were fabricated by sol-gel spin coating technique. The structures and properties of the films were investigated. The addition of Ir increased the volume of the unit cell, atomic packing fraction, and grain size of the thin films. Optical bandgap decreased with Ir substitution. The transmittance and optical dielectric properties were also affected by Ir doping.
Article
Materials Science, Ceramics
Rufus O. Ijeh, Cyril O. Ugwuoke, Ernest B. Ugwu, Samson O. Aisida, Fabian I. Ezema
Summary: Copper-doped ZrO2 thin films were synthesized using the electrodeposition technique, and their magnetic, optical, surface morphology, and structural properties were studied using various characterization techniques. The results showed that the doped samples had larger grain sizes, smaller energy band gaps, and unique ferromagnetic ordering.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
N. Elkhoshkhany, Samir Marzouk, M. El-Sherbiny, Hend Anwer, Mohammed S. Alqahtani, H. Algarni, Manuela Reben, El Sayed Yousef
Summary: A new series of borosilicate glass doped with Dy3+ ions was manufactured using a glass-quenching technique, showcasing unique luminescence properties with intense emission bands. The fabricated glass was used as a solid laser source for white light production, demonstrating strong emission transitions and high branching ratios. The study also evaluated physical parameters and bonding nature of the glass, suggesting potential applications in luminescent display devices as a white light laser diode.
RESULTS IN PHYSICS
(2021)
Article
Metallurgy & Metallurgical Engineering
Emine Guneri, Johnson Henry, Fatma Gode, Nilgun Kalaycioglu Ozpozan
Summary: Pure ZnO and Mn-doped ZnO thin films were prepared by chemical bath deposition method with various Mn doping concentrations. The structural, morphological, and optical properties of the films were analyzed using different techniques. XRD analysis revealed hexagonal structured ZnO in all films, with a peak shift observed in Mn-doped films. The crystallite size increased with Mn doping. The surface morphology of Mn-doped films exhibited irregularly shaped agglomerated particles. The transmittance spectra showed higher transmittance in the visible region, which decreased with Mn doping, indicating increased optical absorption. The band gap of Mn-doped films decreased with Mn doping. Mn-doped films exhibited higher optical and electrical conductivity in the UV region.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Materials Science, Multidisciplinary
Fatma Gami, I. Guizani, M. A. Sebak, Amr Attia Abuelwafa, M. M. Mostafa
Summary: In this study, PCBM/ZnOEP thin films were prepared using the spin coating technique by adjusting their relative ratio. The films exhibited amorphous growth and homogeneous agglomeration with increasing PCBM concentration. Raman spectrum confirmed the composite production. The indirect-energy band gap was calculated through optical absorption measurements. The disorder in the films affected various optical and dielectric parameters. The presence of PCBM improved the nonlinear optical parameters of PCBM/ZnOEP thin films. Overall, the study suggests potential optoelectronic device applications for PCBM/ZnOEP thin films.
Article
Materials Science, Multidisciplinary
Ahmed H. Hammad, M. Sh Abdel-wahab, Asim Jilani
Summary: In this study, zinc oxide thin films doped with various ratios of niobium were successfully synthesized using direct current/radio frequency sputtering technique. The effects of niobium on the films were examined through XPS, XRD, and atomic force microscopy. As the niobium content increased, changes in the physical structure, roughness, and optical properties of the ZnO films were observed and confirmed.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Elena V. Aleksandrovich, Aleksandr N. Aleksandrovich, Konstantin G. Mikheev, Gennady M. Mikheev
Summary: Four non-crystalline GexSe100-x (x = 15-25 at. %) films were synthesized by vacuum-thermal deposition of glassy Ge-Se alloys. The films were found to be semiconductors with an indirect band gap energy of 2.0-2.07 eV, as determined by spectroscopic ellipsometry. Anomalous dispersion of the refractive index was observed in the films at wavelengths of 240-500 nm, with the maximum refractive index and its corresponding wavelength depending on the Ge concentration. The highest values of the nonlinear coefficients & chi;(3) and n2 were achieved in the film with a Ge concentration of 15 at. %. The results can be utilized for the development of Ge-Se optical filters with adjustable blue absorption band edge.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
M-B Bouzouraa, A. En Naciri, Y. Battie, S. Dalmasso, S. Diliberto, A. Bouche, N. Chaoui
Summary: This study investigated the effects of nitrogen N+2 ion beam on TiO2 thin films using various techniques such as Raman spectroscopy, grazing incidence X-ray diffractometer (GIXRD), X-ray photoelectron spectroscopy (XPS), spectroscopic ellipsometry (SE), atomic force microscopy (AFM), and photoluminescence spectroscopy (PL). The results showed significant changes in the physical properties of TiO2 after exposure to the N+2 ion beam.
Article
Engineering, Electrical & Electronic
Ph Nonglen Meitei, Borish Moirangthem, Chitralekha Ngangbam, Mir Waqas Alam, Naorem Khelchand Singh
Summary: In this study, gadolinium oxide thin films were successfully deposited on a silicon substrate using electron beam evaporation technique, and the films were polycrystalline with a cubic crystal system after annealing at different temperatures. The annealed films showed improved electrical performance and fast switching response, making them suitable for photodetector applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Mustafa Kavgaci, Adnan Kucukonder, Suleyman Kerli
Summary: Indium oxide and boron-doped indium oxide thin films were synthesized using the spray pyrolysis method. XRD measurements revealed a cubic structure in the films, while morphological analysis showed overall homogeneity. Experimental investigation showed that boron doping increased transmittance rates and positively contributed to radiation shielding properties in the thin films.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Sung Kim, Dong Hee Shin, Ju Hwan Kim, Chan Wook Jang, Jun Woo Park, Hosun Lee, Suk-Ho Choi, Seung Hyun Kim, Ki-Ju Yee, Namrata Bansal, Seongshik Oh
Article
Chemistry, Physical
Jin Hee Kim, Suekyung Oh, Yun Min Kim, Hyeon Seob So, Hosun Lee, Jong-Soo Rhyee, Su-Dong Park, Sung-Jin Kim
JOURNAL OF ALLOYS AND COMPOUNDS
(2016)
Article
Physics, Multidisciplinary
Hyeon Seob So, Sang Bin Hwang, Dae Ho Jung, Hosun Lee
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2017)
Correction
Physics, Applied
Kun Hee Ko, Hyeon Seob So, Dae Ho Jung, Jun Woo Park, Hosun Lee
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Materials Science, Coatings & Films
Dae Ho Jung, Hyeon Seob So, Jae Seong Ahn, Hosun Lee, Trang Thi Thu Nguyen, Seokhyun Yoon, So Yeun Kim, Haeng-Yoon Jung
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2018)
Article
Materials Science, Coatings & Films
Dae Ho Jung, Hyeon Seob So, Hosun Lee
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2019)
Article
Materials Science, Coatings & Films
Dae Ho Jung, Hyeon Seob So, Hosun Lee, Jin-Yeong Park, Han-Ki Kim
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2019)
Article
Materials Science, Multidisciplinary
Dae Ho Jung, Ye Jin Oh, Woo Sung Park, Hosun Lee
CURRENT APPLIED PHYSICS
(2020)
Article
Physics, Applied
Dae Ho Jung, Ye-Jin Oh, Sang-Hwi Lim, Han-Ki Kim, Hosun Lee
Summary: Amorphous gallium/titanium co-doped indium oxide (GTiIO) films show potential as transparent conducting electrodes for flexible electronic devices. By optimizing oxygen flow rates during sputtering, high transmittance and low resistivity films were obtained with estimated optical gap energies close to 3.4eV. Carrier density is proportional to the Drude tail amplitude, and an electronic transition was observed in the spectra at specific oxygen flow rates.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Coatings & Films
Ye Jin Oh, Dae Ho Jung, Jae Jun Lee, Thi Thu Nguyen, Jong Soo Rhyee, Hosun Lee
Summary: The optical and electrical properties of La1-xSrxVO3 films grown on LSAT substrates were investigated. The films showed a semiconductor-to-metal transition near x = 0.2 and had high crystallinity. The interband transition energies of O 2p to V 3d states changed linearly with increasing Sr content.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Nanoscience & Nanotechnology
Jae Jun Lee, Dae Ho Jung, Dong Hee Shin, Hosun Lee
Summary: A heterostructure composed of graphene and LaVO3 shows great potential for high-performance semitransparent photodetectors. The PD with L(n)=2 demonstrates the best performance with high responsivity and detectivity, and exhibits good stability.
Article
Materials Science, Multidisciplinary
Thi Thu Nguyen, Dae Ho Jung, Jae Jun Lee, Hosun Lee
Summary: Diagnosis of semiconductor defect levels is crucial for device applications. In this study, the optical and electrical properties of Ga2-xSnxO3 (GTO) films were investigated to examine their defect levels. The optical constants were determined using spectroscopic ellipsometry, and cathodoluminescence spectroscopy was used to identify the transitions between valence and defect-induced gap states in the GTO films.
Article
Chemistry, Physical
Jae Jun Lee, Dong Hee Shin, Dae Ho Jung, Si Duck Oh, Hosun Lee
Summary: The combination of high absorption LaVO3 and two-dimensional semiconductor material is ideal for high-performance broadband photodetector applications. MoS2/LaVO3 heterojunction photodetectors exhibit good properties, including a high photocurrent/dark current ratio, a high responsivity, and a fast response time. The loss of the responsivity is minimal after extended exposure to air, demonstrating the potential of MoS2/LaVO3 heterojunctions as self-powered optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Dong Hee Shin, Dae Ho Jung, Hosun Lee
Summary: In order to effectively utilize solar energy, it is necessary to have semitransparent solar cells in various fields. This study reports on semitransparent solar cells based on triethylenetetramine(TETA)-doped graphene (Gr) transparent conductive electrode (TCE)-based LaVO(3). By optimizing the Gr TCE with different TETA concentrations, the highest efficiency of 1.45% and average visible transmittance of 62% were achieved at the TETA concentration of 0.2 mM. The TETA-Gr/LaVO3 structure not only harvests solar energy but also exhibits translucency. The addition of an Al reflective mirror further increases the power conversion efficiency (PCE) to 1.99%.
Article
Materials Science, Multidisciplinary
Dianta Ginting, Chan-Chieh Lin, R. Lydia, Hyeon Seob So, Hosun Lee, Junpil Hwang, Woochul Kim, Rabih Al Rahal Al Orabi, Jong-Soo Rhyee