Article
Chemistry, Physical
Junjie Jiang, Constantine Tsounis, Leighanne C. Gallington, Yongfeng Hu, Robert W. J. Scott, Jason A. Scott, Nicholas M. Bedford
Summary: Metal oxide nanomaterials synthesized using a biomineralization-inspired method have been shown to have increased surface area and controllable catalytic properties. The use of protamine as a protein template resulted in largely disordered materials with changes in atomic structure dependent on synthetic conditions. Removal of protamine and subsequent hydrogenation induced defects in the materials while retaining their disordered nature, showing potential for controlling catalytic properties using benign synthetic strategies.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Larissa Q. Huston, Alois Lugstein, Guoyin Shen, David A. Cullen, Bianca Haberl, Jim S. Williams, Jodie E. Bradby
Summary: High-pressure synthesis can create promising silicon allotropes, some of which have direct band gaps under tensile strain while others have narrow band gaps and good absorption properties. This study has discovered a new pressure-temperature pathway for producing silicon nanowires with transformative properties, opening up new possibilities for nanomaterial synthesis.
Article
Chemistry, Physical
Takuya Matsui, Shona McNab, Ruy Sebastian Bonilla, Hitoshi Sai
Summary: Dopant-free and full-area passivating hole contacts can improve the efficiency of solar cells and have the potential to simplify the manufacturing process.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Joonsup Shim, Jinha Lim, Dae-Myeong Geum, Jong-Bum You, Hyeonho Yoon, Joon Pyo Kim, Woo Jin Baek, Jae-Hoon Han, Sanghyeon Kim
Summary: This article demonstrates on-chip optical power monitoring using a waveguide bolometric detector with a TiOx/Ti/TiOx tri-layer film on the silicon-on-insulator platform. The device utilizes free-carrier absorption in a heavily doped silicon waveguide and has a rapid response time, making it suitable for various optical sensing applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Materials Science, Multidisciplinary
T. K. Adhila, Hemaprabha Elangovan, Kamanio Chattopadhyay, Harish C. Barshilia
Summary: This study reports the controlled fabrication of kinked silicon nanowires using ethanol mixed MACE method, where the properties of kinked SiNWs can be controlled by varying ethanol volume and etching time. The presence of ethanol in the etching solution affects the availability of H2O2 and HF at Si/Ag interface, thus influencing the entire etching process. Additionally, tuning the amount of ethanol can adjust the room temperature photoluminescence emission of kinked SiNWs.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Physical
Jongsu Seo, SungHyun Jeon, Siwon Lee, Dae-Kwang Lim, Jun Hyuk Kim, Jeong Hwan Kim, Sejong Ahn, WooChul Jung
Summary: In this study, the dispersion and durability of Pt nanocatalysts were significantly improved by introducing nanoscale amorphous TiOx. The ultrathin TiOx layer on the conductive electrode promoted the migration of TiOx to the Pt surface, creating a metal-oxide interface. This provided a new direction for the design of supported metal catalysts for high-temperature applications.
Article
Chemistry, Physical
Mohammed Abdelhameed, Mostafa F. Abdelbar, Mohamed Esmat, Wipakorn Jevasuwan, Naoki Fukata
Summary: This study investigates the hole-injection characteristics of dopant-free vanadium oxide (VOx) semiconductor thin films. The crystal structure of solution-processable VOx films changes with different annealing atmospheres. The VOx films show effective hole-injection properties due to their high work function, wide band gap, and presence of oxygen deficiencies. The vacuum-annealed VO2-x (B) film exhibits the best hole-injection ability. The use of VOx films as hole-injection layers has significant implications for the development of low-cost and durable electronics and optoelectronics devices.
Article
Nanoscience & Nanotechnology
Min-Ji Kim, Jong-Seong Bae, Myung-Jin Jung, Eunsong Jeon, Yiseul Park, Hasmat Khan, Se-Hun Kwon
Summary: Defect control in TiO2 thin films is challenging but crucial for improving photoelectrochemical (PEC) efficiency in water splitting processes. In this study, defective amorphous TiOx thin films were prepared by atomic layer deposition (ALD) at various growth temperatures. The defect concentration in the films was found to be controllable by adjusting the growth temperature during ALD, as analyzed by X-ray photoelectron spectroscopy and electron spin resonance spectroscopy. The light absorption properties of the films were characterized using ultraviolet-visible absorption spectroscopy. The film deposited at 200 degrees C exhibited the highest defect concentration and photocurrent density compared to other films. By carefully studying the light absorption efficiency, photogenerated charge separation efficiency, and charge transfer efficiency, the correlation between defect concentration and PEC activity in the prepared TiOx thin films was understood. This study provides insights into the PEC properties of defective amorphous ALD-TiOx thin films.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Shinsuke Miyagawa, Kazuhiro Gotoh, Kentaro Kutsukake, Yasuyoshi Kurokawa, Noritaka Usami
Summary: The use of Bayesian optimization in the fabrication of high-performance titanium oxide/silicon oxide/crystalline silicon passivating contact accelerated the process optimization, significantly improving carrier selectivity S10 through simultaneous optimization of multiple parameters with samples treated in the same batch.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Chemistry, Analytical
Elham Fakhri, Rodica Plugaru, Muhammad Taha Sultan, Thorsteinn Hanning Kristinsson, Hakon Orn Arnason, Neculai Plugaru, Andrei Manolescu, Snorri Ingvarsson, Halldor Gudfinnur Svavarsson
Summary: This study reports the results of a piezoresistance investigation on randomly distributed and interconnected silicon nanowire arrays for pressure sensing applications. The piezoresistance response of the arrays was analyzed by measuring their I-V characteristics under uniaxial and isostatic pressure. The interconnected nanowires exhibited higher mechanical stability compared to separated or periodic nanowires, enabling high-resolution pressure measurements.
Article
Chemistry, Physical
Mohamed M. Shehata, Thien N. Truong, Gabriel Bartholazzi, Daniel H. Macdonald, Lachlan E. Black
Summary: TiOx-based electron-selective contacts with high optical transparency and excellent passivation of silicon surfaces have been achieved using atomic layer deposition (ALD) technique. However, stability challenges have hindered their commercialization. The use of an AlyTiOx/TiyZnOx/TiOx/ZnO/ITO multilayer structure, which addresses these stability challenges, allows for highly stable and outstanding passivation performance. This breakthrough is a crucial step towards highly efficient crystalline silicon (c-Si) solar cells.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Mohamed M. Shehata, Daniel H. Macdonald, Lachlan E. Black
Summary: The key part of the high level of surface passivation of ALD TiOx layers is due to the accumulation of chlorine (Cl) at the Si surface. This passivation mechanism can be classified as an effective passivation element, similar to the role of hydrogen in passivating Si dangling bonds. The presence of residual chlorine emphasizes the importance of enhancing the passivation of buried interfaces and motivates the use of metal chloride precursors for silicon surface passivation applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
K. P. Mithun, Shalini Tripathi, Ahin Roy, N. Ravishankar, A. K. Sood
Summary: We investigated carrier relaxation dynamics in semiconducting tellurium nanowires using ultrafast time-resolved terahertz spectroscopy. The relaxation process was found to exhibit bi-exponential decay with two time scales depending on the amount of capping agent on the TeNWs surface. A coupled rate equation model was used to quantitatively understand the relaxation mechanisms and the observed temperature-dependent dynamics. Furthermore, the frequency-dependent THz photoconductivity was modeled using the Boltzmann transport equation, revealing the contributions of short range and Coulomb scattering rates in the relaxation process.
Article
Nanoscience & Nanotechnology
Mohamed M. Shehata, Daniel H. Macdonald, Lachlan E. Black
Summary: This study demonstrates that the passivation performance of amorphous thin-film TiOx prepared via atomic layer deposition strongly depends on the accumulation of chlorine at the silicon surface. It shows that ALD TiOx can be used as a capping layer to reduce silicon surface recombination and emphasizes the importance of residual chlorine in enhancing interface passivation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Shu-Meng Yang, Hsi-Kai Yen, Kuo-Chang Lu
Summary: In this study, high-density and crystalline indium tin oxide nanowires (ITO NWs) were synthesized by chemical vapor deposition, and silver nanoparticles were decorated on the surface of the NWs using an electrochemical method. The ITO NWs exhibited visible light-emitting properties and high resistivity, indicating their potential application in electronic and optoelectronic devices.
Article
Chemistry, Physical
K. A. Bosnick, H. M. Wang, T. L. Haslett, M. Moskovits
JOURNAL OF PHYSICAL CHEMISTRY C
(2016)
Article
Chemistry, Analytical
Wei Zheng, Peng Li, Remko van den Hurk, Stephane Evoy
Article
Anatomy & Morphology
K. Cui, K. Bosnick, R. Indoe, M. Malac, R. A. Mcleod
MICROSCOPY RESEARCH AND TECHNIQUE
(2017)
Article
Chemistry, Analytical
Somayyeh Poshtiban, Muhammad Afzal Javed, Denis Arutyunov, Amit Singh, Graham Banting, Christine M. Szymanski, Stephane Evoy
Article
Chemistry, Analytical
Upasana Singh, Denis Arutyunov, Urmila Basu, Henrique Dos Santos Seckler, Christine M. Szymanski, Stephane Evoy
ANALYTICAL METHODS
(2014)
Article
Virology
Muhammad Afzal Javed, Hans-Wolfgang Ackermann, Joana Azeredo, Carla M. Carvalho, Ian Connerton, Stephane Evoy, Jens Andr Hammerl, Stefan Hertwig, Rob Lavigne, Amit Singh, Christine M. Szymanski, Andrew Timms, Andrew M. Kropinski
ARCHIVES OF VIROLOGY
(2014)
Article
Materials Science, Coatings & Films
Nathan Nelson-Fitzpatrick, Csaba Guthy, Somayyeh Poshtiban, Eric Finley, Kenneth D. Harris, Brian J. Worfolk, Stephane Evoy
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2013)
Article
Multidisciplinary Sciences
Muhammad A. Javed, Somayyeh Poshtiban, Denis Arutyunov, Stephane Evoy, Christine M. Szymanski
Article
Chemistry, Analytical
Remko van den Hurk, Stephane Evoy
SENSORS AND ACTUATORS B-CHEMICAL
(2013)
Review
Instruments & Instrumentation
Khaled S. Ramadan, D. Sameoto, S. Evoy
SMART MATERIALS AND STRUCTURES
(2014)
Article
Chemistry, Multidisciplinary
Pouyan Motamedi, Ken Bosnick, Ken Cadien, James D. Hogan
ADVANCED MATERIALS INTERFACES
(2018)
Article
Nanoscience & Nanotechnology
Angela Beltaos, Adam Johan Bergren, Ken Bosnick, Nikola Pekas, Stephen Lane, Kai Cui, Aleksandar Matkovic, Al Meldrum
Article
Nanoscience & Nanotechnology
Pouyan Motamedi, Ken Bosnick, Kai Cui, Ken Cadien, James David Hogan
ACS APPLIED MATERIALS & INTERFACES
(2017)
Article
Materials Science, Multidisciplinary
Ken Bosnick, Nathalie Chapleau, Michel Champagne, Adam Bergren, Abdelkader Benhalima, Steve Launspach
Article
Materials Science, Multidisciplinary
Ken Bosnick, Pouyan Motamedi, Tim Patrie, Kenneth Cadien