Article
Materials Science, Multidisciplinary
E. Zielony, M. A. Pietrzyk
Summary: This paper focuses on fundamental studies of ZnO/ZnMgO nanowire p-n junctions grown by MBE on Si substrate for UV light emitting sources. The investigation of defects responsible for optical emission from the nanowires was emphasized, and electro-optical properties of the diodes were studied through PL and DLTS. Fabrication of n-ZnMgO/p-Si p-n junctions and verification of their quality through electrical measurements were also conducted. PL experiments revealed excitonic transitions and a deep-level emission peak, with the depletion region located on the n-type side of the p-n junction according to C-V results. DLTS measurements identified electron traps related to ZnO, with parameters such as activation energies and capture cross sections determined.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Optics
Mohamed Helmi Hadj Alouane, Olfa Nasr, Hammadi Khmissi, Bouraoui Ilahi, Gilles Patriarche, Mohamad M. Ahmad, Michel Gendry, Catherine Bru-Chevallier, Nicolas Chauvin
Summary: This study reported on the optical properties of InAs/InP quantum rod-nanowires grown on silicon substrates by molecular beam epitaxy, showing great potential as III-V nanoemitters for telecom-band applications. The nanostructure exhibited high stability of photoluminescence intensity at low temperatures and emitted at a wavelength of 1.55 μm at room temperature.
JOURNAL OF LUMINESCENCE
(2021)
Article
Nanoscience & Nanotechnology
Mingyan Xue, Wenbo Peng, Xuefeng Tang, Yahui Cai, Fangpei Li, Yongning He
Summary: The performance of a photodetector consisting of micropyramid structured p-Si/n-ZnO NWs heterojunction is optimized using the pyro-phototronic effect, leading to a significant increase in photoresponsivity. Furthermore, the introduction of chopper frequency and a thin film Al layer as the back electrode further improve the photocurrent and photoresponsivity. The coupling between the pyrophototronic effect and the piezo-phototronic effect is analyzed, showing a decrease in photoresponsivity and photocurrent under compressive strain.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Chandra Prakash Gupta, Amit Kumar Singh, Praveen K. Jain, Shashi Kant Sharma, Shilpi Birla, Sandeep Sancheti
Summary: The study investigates the temperature-dependent electrical transport properties of n-ZnO/AlN/p-Si heterojunction diode fabricated by RF sputtering system in a wide temperature range. The AlN buffer layer between ZnO and Si improves electrical and structural characteristics by reducing the thermal expansion coefficient/lattice constant mismatch. The thermal stability within the studied temperature range is demonstrated through the apparent barrier height reduction and rising Ideality factor in the temperature-dependent I-V curve. Additional evaluation of barrier height and Richardson constant, as well as estimation of the modified Richardson constant considering Gaussian distribution of inhomogeneous barrier heights, have been conducted.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Vladislav O. Gridchin, Konstantin P. Kotlyar, Rodion R. Reznik, Anna S. Dragunova, Natalia Kryzhanovskaya, Vera V. Lendyashova, Demid A. Kirilenko, Ilya P. Soshnikov, Dmitrii S. Shevchuk, George G. Cirlin
Summary: This study investigates the influence of growth conditions on the physical and optical properties of InGaN nanowires, showing that a slight change in growth temperature can lead to significant changes in the structural and optical properties of the nanowires. The results suggest a novel approach for monolithic growth of InGaN nanowires with multi-color light emission on Si substrates by setting a temperature gradient over the substrate surface.
Article
Materials Science, Multidisciplinary
S. Mandal, B. Nag Chowdhury, A. Tiwari, S. Kanungo, N. Rana, A. Banerjee, S. Chattopadhyay
Summary: This study presents a new method of growing stable crystalline ST12-Ge thin films on Si substrate using a nonequilibrium VLS technique. By inducing process stress as a function of growth temperature and film thickness, the study explores the band engineering of ST12-Ge. The results show that the ST12-Ge films grown at 180-250 degrees C possess good thermal stability and have compressive stress ranging from 0.5-7.5 GPa. The measured band gaps vary within a certain range for different stresses.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
E. Zielony, A. Wierzbicka, R. Szymon, M. A. Pietrzyk, E. Placzek-Popko
Summary: This study focused on the structural properties of ZnO/CdO and ZnO/ZnCdO multiple quantum well nanowires grown on Si substrates using molecular beam epitaxy. The experiments revealed the presence of tensile strain in the samples through analysis of micro-Raman spectroscopy and X-ray diffraction.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
A. Al-Khafaji, N. Soylu-Koc, S. P. Altintas, M. Dogruer, C. Altug, M. Gokcen, A. Varilci
Summary: We conducted an in-depth study on the growth, structural properties, and frequency-dependent dielectric function of ZnO nanorods. The results showed that the nanorods have a hexagonal wurtzile structure and exhibit frequency-dependent dielectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Abderrahmane Hamdi, Ahmad Hamieh, Mervat Alamri, Karim Dogheche, M. M. Saj Mohan, Rachel Desfeux, Denis Remiens, Elhadj Dogheche
Summary: In this study, a piezoelectric structure based on ZnO nanowires was successfully fabricated using a hydrothermal method. The effect of various parameters on the structure and performance of the nanowires was investigated. The results showed the presence of different impurity phases during the fabrication process and revealed the piezoelectric characteristics of the ZnO nanowires.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Meriem Aloui, Loubna Mentar, Abdelkrim Beniaiche, Amor Azizi
Summary: In this paper, the influence of current density on ZnO nanosheets formed by electrochemical deposition and the effect of mode on ZnO nanosheets and nanowires were studied. Current density had significant effects on the properties of ZnO nanosheets, while the mode transformation had important impacts on the crystallization, optical transmittance, and carrier density of ZnO nanosheets and nanowires.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
Guoyin Wang, Zhongxuan Qiu, Tao Liu, Yang Chen, Shuwen Wang, Feifei Xin, Yu Yueqin
Summary: This study constructed various supramolecular structures based on naphthalenediimides using an ionic self-assembly strategy, and investigated the opto-electrochemical properties of materials with different microstructures. The results suggest that electrostatic attraction, hydrophobic interaction, and pi-pi stacking are determining factors in morphological evolution, with assemblies of different morphologies exhibiting different properties, where sheet-like assemblies have lower charge transfer resistance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Electrical & Electronic
Baris Kinaci, Chousein Bairam, Yesim Yalcin, Erman Cokduygulular, Caglar Cetinkaya, Halil Ibrahim Efkere, Suleyman Ozcelik
Summary: This study examined the dielectric properties of titanium doped ZnO thin film and found that its dielectric parameters are highly frequency dependent.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
R. Szymon, E. Zielony, A. Lysak, M. A. Pietrzyk
Summary: In this study, a pair of heterojunctions with different types of interlayer, n-ZnO/ZnCdO and n-ZnCdO/ZnO, were grown and investigated. The electrical properties and parameters of these heterojunctions were characterized using current-voltage (I-V) characteristics and capacitance-voltage characteristics. Different carrier transport mechanisms were observed, including tunneling, multi-tunneling capture-emission, and space-charge limited currents. Defects in the junctions were characterized using deep level transient spectroscopy, and the influence of cadmium ions in the ZnCdO interlayer on trap levels was observed. The interlayer type was found to affect junction parameters and current transport mechanisms. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yang Min, Chuandong Dou, Hongkun Tian, Jun Liu, Lixiang Wang
Summary: Incorporating B<-N units into pi-conjugated systems is an effective strategy to design organic small molecules and polymers with intriguing opto-electronic properties. The position of the B<-N units significantly influences the electronic structures of adjacent rings, leading to tunable opto-electronic properties of the molecules. Organoboron pi-conjugated molecules show potential for use in organic semiconductors for excellent device performance.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Materials Science, Ceramics
Jing Shi, Bailing Jiang, Zheng Liu, Cong Li, Fangyuan Yan, Xiansheng Liu, Hongtao Li, Chao Yang, Dan Dong, Juan Hao
Summary: In this study, a silicon nanowires/titanium nitride electrode (Si NWs/TiN) was successfully prepared by depositing TiN onto etched silicon nanowires using direct current magnetron sputtering. The effect of etched silicon substrate morphology on the electrochemical performance of the Si NWs/TiN electrode was investigated. The prepared Si30 NWs/TiN electrode exhibited excellent specific capacitance and cyclic stability.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Manoj K. Ram, Philip D. Myers, Chand Jotshi, D. Yogi Goswami, Elias K. Stefanakos, Konstantinos D. Arvanitis, Elias Papanicolaou, Vassileios Belessiotis
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2017)
Review
Materials Science, Multidisciplinary
Srikanth Gunti, Ashok Kumar, Manoj K. Ram
INTERNATIONAL MATERIALS REVIEWS
(2018)
Article
Nanoscience & Nanotechnology
Ibrahim Azad, Manoj K. Ram, D. Yogi Goswami, Elias Stefanakos
Article
Electrochemistry
Belqasem Aljafari, Turki Alamro, Manoj K. Ram, Arash Takshi
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2019)
Article
Energy & Fuels
Zhenxing Han, Manoj Kumar Ram, Rajeev Kamal, Turki Alamro, D. Yogi Goswami, Chand Jotshi
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2019)
Article
Nanoscience & Nanotechnology
Fatemeh Khorramshahi, Adam G. Woughter, Manoj K. Ram, Ioannis Kymissis, Arash Takshi
ADVANCED ELECTRONIC MATERIALS
(2019)
Article
Electrochemistry
Belqasem Aljafari, Sharan K. Indrakar, Manoj K. Ram, Prasanta K. Biswas, Elias Stefanakos, Arash Takshi
Article
Energy & Fuels
Tareq Kareri, Mohammad Shakhawat Hossain, Manoj K. Ram, Arash Takshi
Summary: In this study, three flexible fiber-shaped hybrid devices were designed and fabricated using twisting conductive threads as electrodes and a photoactive polyaniline-based gel electrolyte. These devices demonstrated the dual properties of energy harvesting and storage. The highest capacitance was achieved in the device with the anode made of Ny66-Ag/CNT, while the device with the electron transport layer (ETL) exhibited a photovoltage of 37 mV when exposed to light for 400 s.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Energy & Fuels
Suleyman G. Gizer, Osman Polat, Manoj K. Ram, Nurettin Sahiner
Summary: Anthropogenic activities have led to a significant increase in carbon dioxide emissions, posing a global problem. Despite its harmful effects, CO2 can be potentially utilized in various industries. However, CO2 capture technologies are still in the early stages of development, but advancements in technology and cost reduction may facilitate their wider adoption in the future. Carbon capture is considered a promising solution for mitigating climate change. This review highlights recent CO2 capture technologies and evaluates their potential applications in different industries.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Inorganic & Nuclear
Sahin Demirci, Gorkem Gizer, Osman Polat, Manoj K. Ram, Nurettin Sahiner
Summary: Metal organic frameworks (MOFs) are porous materials with high surface area that can be used in various industrial applications. This paper focuses on the synthesis of fluorescent MOFs using perylene 3,4,9,10 tetracarboxylic dianhydride (PTCDA) as the organic ligand and Co(II) and La(III) metal ions. The fluorescence properties, surface area, and metal ion chelating activity of the prepared MOFs were investigated.
INORGANICA CHIMICA ACTA
(2022)
Article
Materials Science, Composites
Mehtap Sahiner, Betul Ari, Manoj K. Ram, Nurettin Sahiner
Summary: In this study, nitrogen-doped carbon dots (N-doped CDs) with fluorescence and antimicrobial properties were synthesized by the hydrothermal method and embedded within poly(lactic acid-co-glycolic acid) (PLGA) films. The results showed that the fluorescence intensity increased with the amount of CDs in CD@PLGA films. The 50-CD@PLGA films exhibited antimicrobial activity against S. aureus and E. coli microorganisms. Furthermore, the 50-CD@PLGA film released about 38% of the embedded CDs in approximately 12 days and demonstrated good blood compatibility.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Review
Chemistry, Applied
Gorkem Gizer, Umur Onal, Manoj Ram, Nurettin Sahiner
Summary: Biofouling, the accumulation of living organisms on surfaces in contact with water, causes significant problems in various industries. To mitigate these problems, toxic and non-toxic antifouling methods have been developed. However, most of these methods have drawbacks and harm the environment. The main objective of antifouling research is to develop green, sustainable, widely applicable, and environmentally friendly technologies. Chemical, physical, and biological methods have been discussed in this review, highlighting the use of antibacterial surfaces and biomimetic materials.
BIOINTERFACE RESEARCH IN APPLIED CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Danny Illera-Perozo, Humberto Gomez-Vega, Manoj Ram
Summary: A green and scalable synthesis method for polymeric quinone composites with graphene has been developed, utilizing cellulose nanocrystals to improve the electrochemical energy storage performance. This method avoids critical materials, uses low-cost feedstocks, and achieves stable aqueous graphene dispersions. The composite material showed high storage metrics and retained over 70% performance after 1000 charge/discharge cycles.
Proceedings Paper
Optics
Belqasem Aljafari, Manoj K. Ram, Arash Takshi
PHYSICS, SIMULATION, AND PHOTONIC ENGINEERING OF PHOTOVOLTAIC DEVICES VIII
(2019)
Article
Materials Science, Multidisciplinary
Hussein Alrobei, Hye Young Lee, Ashok Kumar, Manoj K. Ram