Physics: Recent submissions

Now showing items 221-240 of 247

Low Cost Solar Cells with Electrodeposited Cuprous Oxide

Siripala, W.; Jayathileke, K.M.D.C.; Jayanetti, J.K.D.S. (Journal of Bionanoscience, 2009)

Cuprous oxide (Cu2O) has been investigated as a low cost semiconductor material for application in environmentally friendly low cost solar cells. Electrodeposition technique was studied to synthesize the material and it ...
Donor and Acceptor Density Variations in Electrodeposited Cuprous Oxide Thin Films

Jayathileke, K.M.D.C.; Siripala, W.; Jayanetti, J.K.D.S. (2007)

Cuprous oxide thin films were electrodeposited in a cupric acetate bath and resulting films were investigated in a photoelectrochemical cell for determining the intrinsic defects density variations. Depth profiles of the ...
Effect of Junction Morphology on the Performance of Polycrystalline Cu2O Homojunction Solar Cells

McShane C M; Siripala W; Choi Kyoung-Shin (Journal of Physical Chemistry Letter, 2010)

Cu2O p?n homojunction solar cells were fabricated by the consecutive electrochemical deposition of p-Cu2O layer, followed by n-Cu2O layer. The surface morphology of p-type Cu2O, which determines the p?n junction interface, ...
Photoluminescence characterization of polycrystalline n-type Cu2O films

Garuthara, R.; Siripala, W. (Journal of Luminescence, 2006)

Electrodeposition was used to deposit Cu2O thin films on ITO substrates. Photoresponse of the film clearly indicated n-type behavior of Cu2O in photoelectrochemical cells. The temperature dependence of photoluminescence ...
Growth and characterisation of potentiostatically electrodeposited Cu2O and Cu thin films

Wijesundera, R.P.; Hidaka, M.; Koga, K.; Sakai, M.; Siripala, W. (Thin Solid Films, 2006)

Cuprous oxide and copper thin films were potentiostatically electrodeposited in an acetate bath. Voltammetric curves were used to investigate the growth parameters; deposition potential, pH and temperature of the bath. ...
Effects of annealing on the properties and structure of electrodeposited semiconducting Cu?O thin films

Wijesundera, R.P.; Hidaka, M.; Koga, K.; Sakai, M.; Siripala, W.; Choi Jae-Young; Sung, N.E. (Physica Status Solidi (basic solid state physics), 2007)

The structures and the electronic states in electrodeposited semiconductor Cu?O thin films have been investigated for each annealing temperature (TA) by X-ray diffraction (XD) and X-ray absorption spectroscopy (XAS) near ...
A Cu2O/TiO2 heterojunction thin film cathode for photoelectrocatalysis

Siripala, W.; Ivanovskaya, A.; Jaramillo, T.F.; Baeck Sung-Hyeon; McFarland, E.W. (Solar Energy Materials and Solar Cells, 2003)

A thin film heterojunction photocathode was developed consisting of 100nm of n-type titanium dioxide (TiO2) cathode surface deposited on p-type cuprous oxide (Cu2O). The cuprous oxide was deposited electrochemically on Ti ...
3D Imprint Lithography Using Sixny Molds

Jayatissa, N.W.K.; Alkaisi, M.M.; Blaikie, R.J. (2002)

Three-dimensional patterning reduces more complicated alignment steps in the fabrication of micro and nano-scale structures. Multiple lithography processes with interlevel alignment or single lithography with multi layer ...
UV absorption properties of natural solutions

Wijesiri, W.D.S.; Jayatissa, N.W.K.; Jayakody, J.R.P. (2008)

Electromagnetic radiation is classified into types according to the frequency of the waves such as radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma ...
Investigating the Thermal Efficiency of Thermo-foils as a Roof Insulation Material and Developing a New Roof Insulation Material Using Coir Fiber

Maduranga, A.D.; Jayatissa, N.W.K.; Sumathipala, H.H. (2011)

The thermo-foil is an insulation material which can be used to insulate roofs of residential buildings which causes less energy to accomplish a comfortable temperature inside the building. In this study, an investigation ...
Study of annealing effects of cuprous oxide grown by electrodeposition technique

Siripala, W.; Perera, L.D.R.D.; de Silva, K.T.L.; Jayanetti, J.K.D.S.; Dharmadasa, I.M. (Solar Energy Materials and Solar Cells, 1996)

Low temperature electrochemical deposition of cuprous oxide from aqueous solutions has been investigated. X-ray diffraction, scanning electron microscopy, optical absorption, and photo-response of liquid/cuprous oxide ...
Sulphidation of electrodeposited cuprous oxide thin films for photovoltaic applications

Wijesundera, R.P.; Perera, L.D.R.D.; Jayasuriya, K.D.; Siripala, W.; de Silva, K.T.L.; Samantilleke, A.P.; Dharmadasa, I.M. (Solar Energy Materials and Solar Cells, 2000)

Electrodeposited cuprous oxide thin films on indium-doped tin oxide (ITO) substrates were sulphided by exposing them to a spray of aqueous solution of sodium sulphide or to a mixture of hydrogen sulphide and nitrogen gases. ...
Observation of Intrinsic Surface States at the TiO2 Aqueous-Electrolyte Interface by Sub Band-Gap Electroreflectance Spectroscopy

Siripala W; Tomkiewicz M (Physical Review Letters, 1983)

Surface states were detected with sub?band-gap electroreflectance spectroscopy in the presence of electrolytes that can adsorb on the surface of TiO2. The energy of these states is located 1.3 eV below the conduction band ...
NMR Studies Of Mass Transport In High Acid Content Fuel Cell Membranes Based On PBI/Phosphoric Acid

Chung, S.H.; Durantino, L.; Jayakody, J.R.P.; Zhang, H.; Xiao, L.; Benicewicz, B.; Greenbaum, S.G. (2004)

Acid doped polybenzimidazole (PBI) has emerged as a promising candidate for a low-cost and high performance fuel cell membrane material. It has been shown that this polymer electrolyte membrane exhibits high ionic conductivity ...
Wave Motion and Sound

Jayakody, J.R.P. (2008)
Deuteron and Oxygen-17 NMR Studies of Molecular Motion in Methanol-Saturated Nafion Membranes

Chen, R.S.; Jayakody, J.R.P.; Greenbaum, S.G. (MRS Proceedings, 1993)

Deuteron and oxygen-17 NMR linewidth and spin-lattice relaxation measurements in Nafion-117 films containing methanol at ?75% and ?100% saturation are reported. Molecular motion probed by room temperature measurements in ...
NMR Studies of Ionic and Molecular Motion in Diglyme:LiCF3SO3 Complexes

Jayakody, J.R.P.; Suarez, S.; Greenbaum, S.G.; Petrowsky, M.; Frech, R. (2004)

Low molecular mass diglyme forms complexes with lithium salts similar to the high molecular mass and much-studied poly(ethylene oxide) (PEO), and thus serves as a useful model for investigating ion solvation,association, ...
A Fundamental Study of the Transport Properties of Aqueous Superacid Solutions

Suarez, S.N.; Jayakody, J.R.P.; Greenbaum, S.G.; Zawodzinski, T.; Fontanella, J.J. (Journal of Physical Chemistry B, 2010)

An extensive investigation of the transport properties of aqueous acid solutions was undertaken. The acids studied were trifluoromethanesulfonic (CF3SO3H), bis(trifluoromethanesulfonyl)imide [(CF3SO2)2NH], and para-toluenesulfonic ...
New membranes based on ionic liquids for PEM fuel cells at elevated temperatures

Ye, H.; Huang, J.; Xu, J.J.; Kodiweera, N.A.C.; Jayakody, J.R.P.; Greenbaum, S.G. (Journal of Power Sources, 2008)

Proton exchange membrane (PEM) fuel cells operating at elevated temperature, above 120 �C, will yield significant benefits but face big challenges for the development of suitable PEMs. The objectives of this research are ...
Correlation Time for Polymer Chain Motion Near the Glass Transition in Nitrocellulose.

Jayakody, J.R.P.; Bulusu, S.; Marino, R.A. (MRS Proceedings, 1993)

The NMR chemical shift anisotropy (CSA) has a temperature dependence as a result of thermal motions of the NMR site. For slow motions of a polymer chain at or near the glass transition, Tg, the CSA begins to decrease, with ...

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