Article
Multidisciplinary Sciences
Ramy El-Bashar, Mohamed Hussein, Salem F. Hegazy, Yehia Badr, B. M. A. Rahman, Kenneth T. Grattan, Mohamed Farhat O. Hameed, Salah S. A. Obayya
Summary: The electrical characteristics of quad-crescent-shaped silicon nanowire solar cells were analyzed numerically to optimize performance, resulting in increased optical absorption and power conversion efficiency. The core-shell junction design showed an improvement of approximately 80% in conversion efficiency due to the high back surface field layer, with minimal impact from nanowire surface recombination compared to the axial junction.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Lijing Wei, Feng Li, Shaoyuan Pang, Yinglong Wang, Jianxin Guo, Jianhui Chen
Summary: In this study, a simple, vacuum-free method was used to fabricate a polymer, Nafion, for passivating the outer-shell defects of Si nanowires (SiNWs). The results showed that the Nafion molecule could firmly adsorb on the surfaces of SiNWs, leading to a high stability of the Nafion-passivated SiNWs in a chemical environment. Additionally, the Nafion-passivated SiNWs exhibited a larger absorption coefficient and an equivalent quantum confinement effect compared to the H-passivated SiNWs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Mohammad Muntasir Hassan, Fariba Islam, Md Zunaid Baten, Samia Subrina
Summary: This study optimizes the InAs nanowire structure to achieve ultra broadband absorption, showing that multi-radii NW arrays exhibit superior performance and robustness at varying angles of incidence with negligible effect on absorption spectra.
Article
Physics, Applied
Hui Xia, Yaqian Liu, Hailu Wang, Tianxin Li, Zhongying Tong, Xiren Chen, Pingping Chen, Weida Hu, Wei Lu
Summary: A feasible route to balance the electric gain and the light absorption efficiency in semiconductor nanowire array has been discovered by injecting photocarriers in the opposite direction, which activates the photoconductive gain to the maximum degree. Experimental results show a high responsivity and bias-voltage control for different working modes.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
R. El-Bashar, M. Hussein, Salem F. Hegazy, Y. Badr, Mohamed Farhat O. Hameed, S. S. A. Obayya
Summary: The study introduces a novel design of silicon NW solar cells with quad crescent shapes and provides theoretical numerical analysis. The structure shows high light absorption efficiency and low cost, with improved absorption rate through multiple light scattering. Compared to conventional NWs, the proposed NW significantly increases short circuit current density and ultimate efficiency.
Article
Multidisciplinary Sciences
Yooji Hwang, Young Hyun Hwang, Kwang Wook Choi, Seungwon Lee, Soojin Kim, Soo Jong Park, Byeong-Kwon Ju
Summary: A new type of flexible and transparent capacitive photodetector was fabricated in this study to address the limitations of conventional photodetectors, with graphene electrodes introduced for excellent overall chemical, thermal, and mechanical durability. Compared to photodetectors with pristine Ag nanowire electrodes, hybrid AgNW/graphene electrode-based photodetectors showed 20% higher photosensitivity, along with low sheet resistance and relatively high transmittance.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Sajad Haghanifar, Paul W. Leu
Summary: We conducted a detailed balance analysis on vertical GaAs nanowire arrays using rigorous coupled-wave analysis (RCWA). Both freestanding and arrayed nanowires on a perfect back reflector were evaluated. Both types of vertical nanowire arrays demonstrated efficiencies surpassing the Shockley Queisser (SQ) or radiative efficiency limit when the nanowires were long enough. The implementation of a back reflector enhanced the efficiency of nanowire solar cells by increasing solar absorption and suppressing emission from the backside of the solar cell. We studied the advantages of light trapping and material reduction in nanowires. Furthermore, we compared the simulations evaluating detailed balance efficiency with ultimate efficiency and showed that ultimate efficiency studies can determine near-optimal solar cells while significantly reducing the number of simulations needed. Although open circuit voltages above the radiative limit can be achieved, tradeoffs with short circuit current must be carefully considered. We also compared our simulation results to claims in the literature that nanowires are capable of exceeding the SQ limit.
Article
Chemistry, Multidisciplinary
Sung Yul Lim, Daye Seo, Min Seok Jang, Taek Dong Chung
Summary: Low-cost catalysts with high activity and durability are essential for efficient large-scale energy conversion in photoelectrochemical cell (PEC) systems. The spatial control of catalysts on photoelectrodes is crucial for efficient utilization of photogenerated charge carriers. Spatial decoupling of light-absorbing and catalytic components in hierarchically structured Si-based photocathodes enhances photoelectrochemical hydrogen evolution reaction (HER) performance.
Article
Chemistry, Multidisciplinary
Ashish Prajapati, Gil Shalev
Summary: This study investigates the use of surface arrays composed of Fresnel nanosystems (Fresnel arrays) to achieve high performance ultra-thin silicon photovoltaic (PV) cells. The results show that specially tailored Fresnel arrays can provide a 20% enhancement in broadband absorption compared to optimized nanopillar arrays. This improvement is attributed to two light trapping mechanisms: light concentration and refraction. Additionally, the PV cells incorporated with surface Fresnel arrays exhibit a significantly higher short-circuit current density (J (sc)) compared to those with optimized nanopillar arrays.
Article
Materials Science, Multidisciplinary
Ivy M. Asuo, Debika Banerjee, Alain Pignolet, Riad Nechache, Sylvain G. Cloutier
Summary: The hybrid photodetector fabricated with a halide perovskite and silicon nanowire heterojunction shows excellent spectral responsivity, high specific detectivity, fast rise/fall times, and good stability under ambient conditions, offering great potential for future integrated optoelectronic devices.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Sara Saeed, Hassan Siddique, Rucheng Dai, Junke Wang, Asad Ali, Chan Gao, Xiaoping Tao, Zhongping Wang, Zejun Ding, Zengming Zhang
Summary: Ag@CdS nanowires were successfully synthesized and exhibited superior light harvesting and photoelectrochemical performance compared to pure CdS nanowires. The photocurrent density and photochemical conversion efficiency of Ag@CdS nanowires were significantly higher, with H-2 generation also being increased.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Liqiang Li, Ming Li, Peng Li
Summary: Polycrystalline Cu(In,Ga)S-2 (CIGS) nanowire arrays were successfully synthesized for the first time via a solvothermal method using Cu2S NWAs as sacrificial templates. A novel cation-exchange growth mechanism was proposed, leading to improved photoelectrochemical performance compared to the pristine Cu2S templates.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Multidisciplinary
Shaoyu Liu, Weiye Yang, Lei Liu, Huohuo Chen, Yingkai Liu
Summary: Ni-doped ZnO nanowire arrays with different Ni concentrations are grown on etched fluorine-doped tin oxide electrodes by hydrothermal method. The morphology and microstructure of the nanowire arrays are investigated and the sensitive property is measured. The Ni-ZnO nanowires with 8 at.% Ni precursor concentration show high selectivity for H2S and a large response compared to other gases.
Article
Chemistry, Multidisciplinary
Munia Ferdoushi, Sumaiya Wahid, Md Kawsar Alam
Summary: In this study, we report the design, optimization, and performance analysis of three axial junction nanowire solar cells based on CdTe, CIGS, and CZTS. These nanowire solar cells show significant improvements in their optical and electrical characteristics compared to planar counterparts. The incorporation of a forward scatterer on top of the front contact further enhances the performance of these nanowire solar cells, leading to increased absorption and improved power conversion efficiency.
Article
Materials Science, Multidisciplinary
Di-Hua Lin, Fang Wan, Shu-Chang Gong, Can Fu, Feng-Xia Liang, Lin-Bao Luo
Summary: Dual-band photodetectors (DBPDs) are widely used in multispectral information monitoring in both civil and military applications. This paper presents a novel DBPD fabricated using a silicon nanowire array, which exhibits dual-band absorption resulting from leaky mode resonances (LMRs) in the nanowires. Experimental results show two peak responsivities at 430 nm and 660 nm, matching well with simulations and confirming the practicality of this silicon-based wavelength-selective spectral detection device.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Optics
Han Lin, Bjorn C. P. Sturmberg, Keng-Te Lin, Yunyi Yang, Xiaorui Zheng, Teck K. Chong, C. Martijn de Sterke, Baohua Jia
Article
Optics
Antoine F. J. Runge, Darren D. Hudson, Kevin K. K. Tam, C. Martijn de Sterke, Andrea Blanco-Redondo
Article
Physics, Applied
Alessandro Tuniz, Stefano Palomba, C. Martijn de Sterke
APPLIED PHYSICS LETTERS
(2020)
Article
Energy & Fuels
Hedda Ransan-Cooper, Bjoern C. P. Sturmberg, Marnie E. Shaw, Lachlan Blackhall
Summary: The digital energy era presents challenges that require improved algorithm governance to ensure the design and use of energy technologies do not lead to adverse public outcomes.
Article
Economics
B. C. P. Sturmberg, M. E. Shaw, C. P. Mediwaththe, H. Ransan-Cooper, B. Weise, M. Thomas, L. Blackhall
Summary: This study addresses the challenges of power flows caused by photovoltaic solar systems in electricity distribution networks by utilizing Community-scale Energy Storage (CES) and local network tariffs, leading to mutually beneficial outcomes for stakeholders.
Article
Engineering, Multidisciplinary
Md. Mejbaul Haque, Peter Wolfs, Sanath Alahakoon, Bjorn C. P. Sturmberg, Firuz Zare, Frede Blaabjerg
Summary: This article presents low-frequency ripple power steering control strategies for a power conversion topology used in PV-BESS/EV applications, where two control strategies are proposed to deal with DLF ripple and their effectiveness is demonstrated through experiments.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
Article
Optics
Tristram J. Alexander, G. A. Tsolias, A. Demirkaya, Robert J. Decker, C. Martijn de Sterke, P. G. Kevrekidis
Summary: We theoretically demonstrate the existence of stable dark solitons in the presence of quartic dispersion and the coexistence of quadratic and quartic dispersive effects, revealing a wider range of solutions and dynamics compared to pure quadratic dispersion. The interplay of the two dispersion orders leads to oscillatory non-vanishing tails and the potential formation of bound, stable multi-soliton states. Additionally, dark soliton-like states connecting to low-amplitude oscillations are shown to be possible. The stability picture is supported by dynamical evolution results, and potential avenues for dark soliton generation are explored.
Article
Environmental Sciences
Kathryn Lucas-Healey, Bjorn C. P. Sturmberg, Hedda Ransan-Cooper, Laura Jones
Summary: This study examines the niche of vehicle-to-grid in Australia and sets an agenda for its development. The findings show that the Australian vehicle-to-grid niche is in its early stages and requires more diversity, non-technical learning, and user engagement.
ENVIRONMENTAL INNOVATION AND SOCIETAL TRANSITIONS
(2022)
Article
Environmental Studies
Hedda Ransan-Cooper, Marnie Shaw, Bjorn C. P. Sturmberg, Lachlan Blackhall
Summary: This paper reports on a research project that aimed to uncover the potential benefits and harms or risks of neighbourhood batteries. The research project integrates different conceptual standpoints and highlights the importance of decision-making regarding benefits distribution and risk mitigation.
ENERGY RESEARCH & SOCIAL SCIENCE
(2022)
Article
Optics
Antoine F. J. Runge, Y. Long Qiang, Tristram J. Alexander, C. Martijn de Sterke
Summary: In this paper, we present a theoretical study on the linear propagation of optical pulses in media with high-order dispersion, which is approximately but intuitively appealing. Our analysis, consistent with numerical simulations, shows that the effect of high-order dispersion differs significantly from that of second order dispersion. For high dispersion orders, the central part of pulses evolves in the same way, independent of the dispersion order, but at different rates and with a weak dependence on the initial pulse shape. We also observe that all pulses, regardless of the initial shape, eventually evolve to a sinc function. Additionally, our treatment allows us to derive expressions for the characteristic dispersion lengths for high dispersion orders.
Article
Chemistry, Analytical
Alessandro Tuniz, Alex Y. Song, Giuseppe Della Valle, C. Martijn de Sterke
Summary: This study proposes a simplified coupled mode theory approach for evaluating and optimizing the sensing properties of plasmonic waveguide refractive index sensors. By calculating propagation constants instead of mode overlap integrals, this method provides a rapid and convenient framework for designing dielectric-plasmonic sensor prototypes.
Proceedings Paper
Engineering, Industrial
Md Mejbaul Haque, Laura Jones, Bjorn C. P. Sturmberg
Summary: This paper demonstrates the impact of grid disturbances on the operation of an off-the-shelf EV charger, showing that the charger may disconnect from the grid in some cases, disrupting the delivery of grid services. Understanding the performance of different EV chargers, especially during grid disturbances, is important as electric vehicles become more widespread in distribution grids.
IEACON 2021: 2021 IEEE INDUSTRIAL ELECTRONICS AND APPLICATIONS CONFERENCE (IEACON)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Shubhankar Kapoor, Lachlan Blackhall, Bjorn Sturmberg, Marnie Shaw
Summary: A new approach for solving the DSSE problem is proposed, which includes line losses in the system more effectively. Through comparison with existing models and testing on specific test feeders, the method shows superior performance in certain cases, especially when transformer power flow measurements are available.
2021 IEEE PES INNOVATIVE SMART GRID TECHNOLOGIES - ASIA (ISGT ASIA)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Md Mejbaul Haque, Laura Jones, Bjorn C. P. Sturmberg, Justus van Biljon
Summary: The four quadrant bidirectional chargers enable EV batteries to provide grid services by modulating their charge/discharge, with a focus on V2G services and the provision of valuable ancillary services, particularly the demand for frequency stabilization services.
2021 24TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS 2021)
(2021)
Article
Optics
Vincent Ng, Alessandro Tuniz, Judith M. Dawes, C. Martijn de Sterke
