Physics: Recent submissions

Now showing items 1-20 of 247

Exploring MBH–P scaling relations in spiral galaxies: a comparative analysis of inner and outer arm structures

Hettiarachchi, Sanjaya; Hewageegana, Prabath; Abdeen, Shameer (2024)

We study the galactic spiral arm pitch angle dependence with wavelength as predicted by the density wave theory. A sample of 10 barred and unbarred spiral galaxies with two distinct, well-defined arms is used for the ...
Cu2O Homojunction Solar Cells: Efficiency Enhancement with a High Short Circuit Current

Thejasiri, S. A. A. B.; Jayathilaka, K. M. D. C.; Kafi, F. S. B.; Kumara, L. S. R.; Seo, O.; Yasuno, S.; Sakata, O.; Siripala, W.; Wijesundera, R. P. (2024)

Cu2O homojunction solar cells were fabricated using potentiostatic electrodeposition technique. n-Cu2O thin films were grown in an acetate bath while p-Cu2O thin films were grown in a lactate bath. In the growth of n-Cu2O ...
Electrodeposited thin film SnO2 photoelectrode for PEC applications

Kafi, F.S.B.; Gunaratna, B.H.; Jayathilaka, K.M.D.C.; Wijesundera, R.P. (Institute of Physics, Sri Lanka, 2024)

Tin oxide (SnO2) is a promising semiconductor material to develop photoelectrodes for photoelectrochemical (PEC) cells. Indeed, an effective PEC cell could be developed only if the photoelectrode is stable and free of ...
Enhancement of Photo-Electrical Properties of CdS Thin Films: Effect of N2 Purging and N2 Annealing

Sankalpa, Gayan K. L.; Kumarasinghe, Gayan R. K. K. G. R.; Dassanayake, Buddhika S.; Kumarage, Gayan W. C. (2024)

The impact of N2 purging in the CdS deposition bath and subsequent N2 annealing is examined and contrasted with conventional CdS films, which were deposited without purging and annealed in ambient air. All films were ...
Nb2O5 Microcolumns for Ethanol Sensing

Kumarage, Gayan W. C.; Panamaldeniya, Shasika A.; Maraloiu, Valentin A.; Dassanayake, Buddhika S.; Gunawardhana, Nanda; Comini, Elisabetta (2024)

Pseudohexagonal Nb2O5 microcolumns spanning a size range of 50 to 610 nm were synthesized utilizing a cost-effective hydrothermal process (maintained at 180 ◦C for 30 min), followed by a subsequent calcination step at 500 ...
Efficiency boost of inverted polymer solar cells using electrodeposited n-type Cu2O electrons selective transport layers (ESTLs)

Wanninayake, WTMAPK; Namawardana, DGKK; Wanigasekara, RMG; Jayathilaka, KMDC; Wijesundera, RP; Siripala, W; Malik, MI (National Science Foundation of Sri Lanka, 2023)

Polymer solar cells (PSCs) have attracted tremendous interest as suitable candidates for harnessing solarenergy in the recent years. The inherent optoelectronic properties of the inorganic transition metal oxide, negative ...
Growth and Characterization of Seed‑Assisted, EDTA‑Treated, Chemical Bath‑Deposited CdS

Kumarage, W. G. C.; Wijesundera, R. P.; Seneviratne, V. A.; Jayalath, C. P.; Gunawardhana, N.; Kaur, N.; Comini, E.; Dassanayake, B. S. (Journal of Electronic Materials, 2021)

A simple low-cost method to enhance the electrical properties including open-circuit voltage (VOC), flat-band potential (Vfb) and short-circuit current (ISC) in the photoelectrochemical (PEC) cell of cadmium sulfide (CdS) ...
Fabrication of inverted organic solar cells on stainless steel substrate with electrodeposited and spin coated ZnO buffer layers

Namawardana, D. G. K. K.; Wanigasekara, R. M. G.; Wanninayake, W. T. M. A. P. K.; Jayathilaka, K. M. D. C.; Wijesundera, R. P.; Siripala, W.; Malik, M. I. (Journal of Polymer Engineering, 2022)

Polymer based organic solar cells (OSCs) are of tremendous interest as suitable candidates for producing clean and renewable energy in recent years. In this study, inverted OSCs on stainless steel (SS) substrate with ...
Effect of pre-surface treatments on p-Cu2O/Au Schottky junctions

Kafi, F.S.B.; Jayathilaka, K.M.D.C.; Wijesundera, R.P.; Siripala, W. (Journal of the National Science Foundation of Sri Lanka,, 2021)

Cuprous oxide (Cu2O) is a suitable semiconducting material in fabrication for low-cost, eco-friendly semiconductor junction devices. Besides the parameterization of the growth conditions of Cu2O, formation of metal contacts ...
Ricochet of AK bullets (7.62 MM X 39 MM) on glazed ceramic tiles: An empirical study in support of shooting incident reconstructions

Nishshanka, B.; Shepherd, C.; Punyasena, M. (Forensic Science International, 2022)

Indoor environments provide numerous hard surfaces and nearby objects which facilitate the shots fired to ricochet off and hit victims. Out of many surface types, ceramic tile surfaces are considered to be one of the most ...
A Comparative Study: Sequential and Single-Step-Electrodeposited CZTS Thin Films

Fernando, W. T. R. S.; Jayathilaka, K. M. D. C.; Wijesundera, R. P.; Siripala, W. (Physica Status Solidi, 2022)

CZTS (Cu2ZnSnS4) is a relatively new and promising semiconductor material suitable for photovoltaic applications due to its favorable optoelectronic properties. Of the many techniques available for growing these films, ...
Molecular tailoring of donor and acceptor materials of organic solar cells for improvement of their optoelectronic properties

Ansari, M. A.; Hafeez, A.; Mustafa, M.; Wijesundera, R. P.; Malik, M. I. (Materials Science in Semiconductor Processing, 2022)

Improvement in the efficiency of organic solar cell (OSC) is one of the hot topics of the modern-day research. Despite environment friendliness and several other practical advantages, the power conversion efficiency (PCE) ...
Fabrication Of Cuprous Oxide Homojunction Solar Cell By Varying The Lactic Acid Ion Concentration Of Thin Film p-Cu2O Deposition Bath.

Thejasiri, A.; Kafi, F. S. B.; Wijesundera, R.; Siripala, W. (ECS Transactions, 2022)

In this stud y, we have investigated the possibility of improving the Voe, FF and 1J values of Cu20 solar cells while preserving the resulted high Jsc values. Here we report that controlling the growth of p-Cu20 by ...
Circularly-polarized-pulse-driven ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN)

Hewageegana, P.; Apalkov, V. (Solid State Communications, 2022)

We predict the fundamentally fastest, ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN) by a circularly-polarized single-oscillation optical pulse. The femtosecond currents in gapped graphene and ...
Smart System Using Lora Technology to Connect Rural Areas Underserved By Existing Internet and Telecommunication Technologies

Jayasekaraa, L.D.P.S.; Gurusinghe, T.N.; Wijesooriya, H.E.; Seneviratne, J.A.; Ranaweera, A.L.A.K.; Jayathilaka, K.M.D.C.; Wijesundera, L.B.D.R.P.; Kalingamudali, S.R.D. (The Electrochemical Society, 2022)

LoRa, Sigfox, and Narrowband-Internet of Things (NB-IoT) are some of the long-distance, low-power wireless communication technologies developed in the recent past. The proposed system consists of mainly nodes and a ...
Circularly-polarized-pulse-driven ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN)

Hewageegana, P.; Apalkov, V. (Solid State Communications, 2022)

We predict the fundamentally fastest, ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN) by a circularly-polarized single-oscillation optical pulse. The femtosecond currents in gapped graphene and ...
Maximum Power Point Tracking of an Off-grid Photovoltaic System Consisting of a Series Connected Supercapacitor with a Step-down Converter

Piyumal, P. L. A. K.; Ranaweera, A. L. A. K.; Kalingamudali, S. R. D.; Kularatna, N. (The Electrochemical Society, 2022)

An off-grid photovoltaic (PV) system's PV array is connected with a charge controller as the first power conversion stage. The average efficiency of the power stage of charge controllers is around 90%. Supercapacitor ...
Effect of pre-surface treatments on p-Cu2O/Au Schottky junctions

Kafi, F.S.B.; Jayathilaka, K.M.D.C.; Wijesundera, R.P.; Siripala, W. (Journal of the National Science Foundation of Sri Lanka, 2021)

Cuprous oxide (Cu2O) is a suitable semiconducting material in fabrication for low-cost, eco-friendly semiconductor junction devices. Besides the parameterization of the growth conditions of Cu2O, formation of metal contacts ...

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