Article
Materials Science, Multidisciplinary
Justin Ryan Phelps, Ashwin Kumar Saikumar, Reza Abdolvand, Kalpathy B. B. Sundaram
Summary: This study reports the material properties of gallium-doped zinc oxide grown from a high impulse magnetron sputtering system (HiPIMS) and compares them to those of radio frequency (RF) sputtering deposition. The results show that HiPIMS and RF processes yield similar outcomes under the same average power conditions. RF depositions exhibit slightly higher band gap and deposition rate, as well as lower resistivity and optical absorption coefficient. Both methods show that band gaps and grain size increase with deposition power.
Article
Materials Science, Ceramics
Marek Bouska, Virginie Nazabal, Jan Gutwirth, Tomas Halenkovic, Petr Nemec
Summary: Radio-frequency magnetron co-sputtering technique was employed to deposit Ge-Sb-Te amorphous thin films, covering a broad range of chemical composition. Large variations in electrical and optical contrast were observed upon annealing-induced crystallization, with the importance of GeTe content in Ge-Sb-Te thin films confirmed.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Xinlu Lin, Yufeng Zhang, Ziyao Zhu, Qiuchen Wu, Xiangxin Liu
Summary: The study highlights that deposition parameters can affect the growth rate and morphology of ZnTe films; the copper atomic concentration has an impact on the optical, structural, and electrical properties of ZnTe films; ZnTe can be used as a buffer layer for back contact to CdTe solar cells.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Zhenxue Zhang, Mikdat Gurtaran, Xiaoying Li, Hio-Ieng Un, Yi Qin, Hanshan Dong
Summary: In this study, N-type and P-type BiTe-based thin films were deposited on silicon, glass, and Kapton HN polyimide foil using magnetron sputtering technique. The morphology, microstructure, and phase constituents of the thin films were characterized by SEM/EDX, XRD, and TEM. The electrical conductivity, thermal conductivity, and Seebeck coefficient were measured by an advanced in-plane test system. The power output (open-circuit voltage and electric current) of the thin films was measured at different temperature gradients using a custom-built apparatus. The impact of deposition parameters and the dimensions of the thin films on the power output were investigated to optimize the thin-film flexible TE device for thermal energy harvesting.
Article
Materials Science, Coatings & Films
Tomasz Wojcik, Vincent Ott, Sedat Oezbilen, Harald Leiste, Sven Ulrich, Paul Heinz Mayrhofer, Helmut Riedl, Michael Stueber
Summary: Transition metal diboride-based thin films have attracted strong interest in both fundamental and applied research. This study investigated the constitution and microstructure of multilayer thin films composed of TiBx and NiAl, and found that the nature of the interfaces has an impact on dislocation density and the ability to form dislocations in these multilayer structures.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Chemistry, Multidisciplinary
Rajib Sahu, Dimitri Bogdanovski, Jan-Ole Achenbach, Siyuan Zhang, Marcus Hans, Daniel Primetzhofer, Jochen M. Schneider, Christina Scheu
Summary: The direct formation of MoB MBene domains in MoAlB thin film by Al deintercalation from MoAlB in the vicinity of AlOx regions is reported. Based on these results, a straightforward processing pathway for the direct formation of MoB MBene-AlOx heterostructures without employing chemical etching is proposed.
Article
Engineering, Electrical & Electronic
Kang Ling, Kuangkuang Li, Ruyu Bai, Bowen Zhao, Xingzhao Liu
Summary: Based on the prospects and needs in industrial, biological, and environmental monitoring fields, there is an urgent demand for the development of high-performance deep-ultraviolet photodetectors. This study successfully grew v thin films on c-plane sapphire substrates and fabricated v photodetectors based on a metal-semiconductor-metal structure, demonstrating fast overall response time, excellent performance characteristics, and high selectivity.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Optics
Zhou Lu, Xin Lv, Quan Xie
Summary: Thin transparent semiconductor films of GaMgZnO were prepared on quartz glass substrates using magnetron sputtering technique. The effects of sputtering pressure on the crystallization, micro-structure, electrical and optical features of the films were investigated. The results showed that sputtering pressure significantly influenced the structure and electro-optical characteristics of the films, with the sample prepared under a pressure of 3.6 Pa exhibiting the best quality and performance.
Article
Materials Science, Multidisciplinary
Chukwudi E. Iheomamere, Corey L. Arnold, Urmilaben P. Rathod, Khalil D. Omotosho, Andrey A. Voevodin, Nigel D. Shepherd
Summary: Spectroscopic and electrical studies of ZnO thin films grown by radio frequency magnetron sputtering at low power without substrate heating revealed improved stoichiometry and reduced free carrier concentration with increasingly energetic growth conditions. Hall measurements showed decreases in carrier concentration as power increased and deposition pressure decreased. These findings were well correlated with XRD, x-ray photoelectron spectroscopy, and photoluminescence results.
Article
Chemistry, Physical
Baofei Hao, Jinpeng Guo, Lan Zhang, Huizhong Ma
Summary: TiO2-based heterojunction nano-thin films with CuO underlayer were prepared by magnetron sputtering. The thickness of the upper TiO2 layer and underlying CuO layer could be precisely controlled. The optimized heterojunction film exhibited excellent photocatalytic activity for Rhodamine B degradation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Shadab Khan, Eugen Stamate
Summary: According to a comparative study, decreasing the energy of oxygen-negative ions with a tuning electrode can improve the uniformity and conductivity of aluminum-doped zinc oxide thin films, but this phenomenon does not hold for gallium-doped zinc oxide and indium-doped tin oxide films.
Article
Materials Science, Multidisciplinary
Ashwin Kumar Saikumar, Sreeram Sundaresh, Shraddha Dhanraj Nehate, Kalpathy B. Sundaram
Summary: In this study, thin films of CuGa2O4 were deposited for the first time using RF magnetron-sputtering technique and post-deposition annealed at varying temperatures. Structural and morphological studies revealed an increase in grain size and decrease in optical transmission with increasing annealing temperature. The optical bandgap value also showed an increasing trend with annealing temperature.
Article
Optics
Manohar Singh, Anit K. Ambedkar, Shrestha Tyagi, Virendra Kumar, Prashant Yadav, Ashwani Kumar, Yogendra K. Gautam, Beer Pal Singh
Summary: In this study, pure ZnO and Cu-doped ZnO thin films were deposited on a glass substrate using reactive co-sputtering. The structural, morphological, and optical properties of the thin films were characterized. The results showed that Cu doping modified the crystal structure, surface morphology, and optical properties of ZnO thin films. These findings are important for the research and applications of Cu-doped ZnO thin films.
Article
Materials Science, Ceramics
Subhashis Samanta, Brijmohan Paramanik, Debajyoti Das
Summary: This manuscript presents a study on the structural characteristics, impedance spectroscopy, ac-conductivity, and dielectric loss of F-doped ZnO films grown by RF-magnetron sputtering at different temperatures. The results show that the electrical impedance spectroscopy can distinguish the contributions of grain and grain-boundary on the electronic properties. The ac-conductivity follows Jonscher power law, indicating hopping of charge carriers under ac electric field. The temperature-dependent dc-conductivity exhibits Arrhenius behavior. The dielectric loss is influenced by the doping level, with the low temperature grown samples showing higher conduction loss.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Camila Ianhez-Pereira, Ariano De Giovanni Rodrigues, Marcio Peron Franco de Godoy
Summary: This study investigated the infrared optical emission of Er3+ doped ZnO hosts, using spray pyrolysis during thin film growth. Different molarity conditions affected the growth of the films and their optical properties. The infrared emissions were influenced by the Stark effect, which was dependent on synthesis parameters.
SCRIPTA MATERIALIA
(2021)
Article
Physics, Applied
Sanjay K. Ram, Rita Rizzoli, Derese Desta, Bjarke R. Jeppesen, Michele Bellettato, Ivan Samatov, Yao-Chung Tsao, Sabrina R. Johannsen, Pekka T. Neuvonen, Thomas Garm Pedersen, Rui N. Pereira, Kjeld Pedersen, Peter Balling, Arne Nylandsted Larsen
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2015)
Article
Materials Science, Multidisciplinary
Ivan G. Samatov, Bjarke R. Jeppesen, Arne Nylandsted Larsen, Sanjay K. Ram
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2016)
Article
Chemistry, Multidisciplinary
Derese Desta, Sanjay K. Ram, Rita Rizzoli, Michele Bellettato, Caterina Summonte, Bjarke R. Jeppesen, Pia B. Jensen, Yao-Chung Tsao, Hartmut Wiggers, Rui N. Pereira, Peter Balling, Arne Nylandsted Larsen
Article
Materials Science, Multidisciplinary
S. R. Johannsen, S. Roesgaard, B. Julsgaard, R. A. S. Ferreira, J. Chevallier, P. Balling, S. K. Ram, A. Nylandsted Larsen
OPTICAL MATERIALS EXPRESS
(2016)
Article
Engineering, Electrical & Electronic
V. Prozheeva, K. M. Johansen, P. T. Neuvonen, A. Zubiaga, L. Vines, A. Yu. Kuznetzov, F. Tuomisto
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2017)
Article
Chemistry, Multidisciplinary
Sanjay K. Ram, Derese Desta, Rita Rizzoli, Michele Bellettato, Folmer Lyckegaard, Pia B. Jensen, Bjarke R. Jeppesen, Jacques Chevallier, Caterina Summonte, Arne Nylandsted Larsen, Peter Balling
Article
Chemistry, Physical
Sanjay K. Ram, Derese Desta, Rita Rizzoli, Bruno P. Falcao, Emil H. Eriksen, Michele Bellettato, Bjarke R. Jeppesen, Pia B. Jensen, Caterina Summonte, Rui N. Pereira, Arne Nylandsted Larsen, Peter Balling
Article
Materials Science, Multidisciplinary
P. Balling, J. Christiansen, R. E. Christiansen, E. Eriksen, H. Lakhotiya, M. Mirsafaei, S. H. Moller, A. Nazir, J. Vester-Petersen, B. R. Jeppesen, P. B. Jensen, J. L. Hansen, S. K. Ram, O. Sigmund, M. Madsen, S. P. Madsen, B. Julsgaard
Article
Engineering, Mechanical
M. de Huu, M. Tschannen, H. Bissig, P. Stadelmann, O. Buker, M. MacDonald, R. Maury, P. T. Neuvonen, H. T. Petter, K. Rasmussen
FLOW MEASUREMENT AND INSTRUMENTATION
(2020)
Article
Engineering, Electrical & Electronic
Manoj Kumar, S. S. Anwer Askari, Sanjay K. Ram, Mukul Kumar Das
Summary: We propose an n-ZnO/p-SnOx heterojunction solar cell as a novel pathway to realize all-oxide photo-voltaics. The effects of material parameters and transport models on the performance of the solar cell were investigated using TCAD device simulator. The simulation results showed that optimizing the bandgap and electron affinity of the SnOx layer can lead to a maximum power conversion efficiency of approximately 15.5%.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Varsha T. Babu, Niveditha Nair, K. S. Parvathy, Bhagyalekshmi S. Panicker, D. Ardra, S. Gopika, M. Anjitha, Sanjay K. Ram
Summary: The effects of front and back contact work functions on the performance of a TiO2/CuO heterojunction solar cell were investigated using numerical simulations. It was found that a high device efficiency of 18% and VOC - 0.83 V can be achieved when the front transparent conducting oxide (TCO) electrode has a work function below 4.6 eV and the metal back contact has a work function above 5.1 eV. The carrier concentration profiles across the device revealed that a higher potential barrier at the front contact interface leads to lower electron collection when the front contact work function is above 4.6 eV, while a lower potential barrier results in higher electron collection when the front contact work function is below 4.6 eV. At the absorber/back contact interface, a higher potential barrier hinders hole collection when the metal back contact has a work function below 5.1 eV.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Niveditha Nair, Varsha T. Babu, Archana Udayan, K. S. Parvathy, B. R. Arya, S. Gopika, M. Anjitha, Sanjay K. Ram
Summary: This paper investigates the influence of the properties of the p-a-Si:H layer and the work function of the front electrode material on the performance parameters of n-c-Si based HIT solar cells through numerical simulation. The underlying charge transport mechanisms are analyzed using energy band diagrams and carrier concentration profiles at the heterointerface of a-Si:H/n-c-Si.
MATERIALS TODAY-PROCEEDINGS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
E. Sharika, M. Anjitha, K. Arya, Niveditha Nair, Sai Kiran, V. Vanagith, Varsha T. Babu, Sanjay K. Ram
Summary: This study investigates the effects of microstructural parameters and defects on the mobility and SPR performance of ITO thin films. The results show that larger grain sizes and higher carrier concentrations improve SPR performance at near-IR wavelengths.
MATERIALS TODAY-PROCEEDINGS
(2022)
Article
Physics, Applied
Derese Desta, Rita Rizzoli, Caterina Summonte, Rui N. Pereira, Arne Nylandsted Larsen, Peter Balling, Sanjay K. Ram
Proceedings Paper
Engineering, Electrical & Electronic
Pekka T. Neuvonen, Edouard Monakhov, Chi Kwong Tang, Jarle Gran, Toomas Kuebarsepp
2015 PHOTONICS CONFERENCE (IPC)
(2015)
