Physics
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Item Spectral responses of electrodeposited cuprous oxide thin film electrodes(Natural Resources, Energy and Science Authority of Sri Lanka, 1995) Siripala, W.Item n-type electrical conductivity in cuprous oxide thin films(Natural Resources, Energy and Science Authority of Sri Lanka, 1988) Siripala, W.; Kumara, K.P.Electrodeposited cuprous oxide thin films were investigated to determine whether their electrical conductivity is n-type or p-type. The experimental results based on the measurements of thermoelectric e.m.f, sheet resistance, dark and light current-voltage characteristics of Cu2O/CuxS and Cu2O/CuCNS heterojunctions reveal that the electrodeposited cuprous oxide films produce n-type electrical conductivity. These observations are in very good agreement with the previously reported n-type behavior of the electro-deposited Cu2O film electrodes in a photo-electrochemical cell.Item Study of double junction effect on the quantum efficiency of optical devices(Sri Lanka Association for the Advancement of Science, 2009) Hansameenu, W.P.T.; Siripala, W.P.Item Characterisation of CuInS2 thin film prepared by electrodeposition and sulphurisation with photoluminescence spectroscopy(Solar Energy Materials and Solar Cells, 2003) Garuthara, R.; Wijesundera, R.P.; Siripala, W.Potentiostatic electrodeposition and sulfurization techniques were used to prepare polycrystalline CuInS2 thin films. X-ray diffraction and photoresponse measurements in a photoelectrochemical cell (PEC) revealed that photoactive polycrystalline CuInS2 films can be deposited on Ti substrate. Photoluminescence (PL) spectroscopy was used to investigate the prepared thin films and optically characterize them. PL spectra revealed the defect structure of the samples with an acceptor energy level at 109 meV above the valance band and a donor energy level at 71 meV below the conduction band. The CuInS2 thin films prepared in this investigation are observed to be In-rich material with n-type electrical conductivity.Item ITO/n-Cu2O/p-CuxS Thin Film Solar Cell(Sri Lanka Association for the Advancement of Science, 1997) Perera, L.D.R.D.; Wijesundera, R.P.; Siripala, W.; Jayasuriya, K.D.; de Silva, K.T.L.; Jayanetti, J.K.D.S.Item Ozone Production by Pulsed power in Dry Air(12th IEEE International Pulsed Power Conference, 1999) Samaranayake W J M; Miyahara Y; Namihira T; Katsuki SItem Characteristics of Ozone Production by Pulsed Power(12th IEEE International Pulsed Power Conference, 1999) Samaranayake, W.J.M.; Miyahara, Y.; Katsuki, S.; Lisitsyn I; Hackam, R.; Akiyama, H.Item Theta nulls of cyclic curves of small genus(Albanian J. Math., 2007) Previato E; Shaska T; Wijesiri G SWe study relations among the classical thetanulls of cyclic curves, namely curves X (of genus g(X)>1) with an automorphism ? such that ? generates a normal subgroup of the group G of automorphisms, and g(X???? )=0 .0. Relations between thetanulls and branch points of the projection are the object of much classical work, especially for hyperelliptic curves, and of recent work, in the cyclic case. We determine the curves of genus 2 and 3 in the locus Mg(G,C) for all G that have a normal subgroup ??? as above, and all possible signatures C, via relations among their thetanulls.Item Degree 4 coverings of elliptic curves by genus 2(Albanian J. Math., 2008) Shaska T; Wijesiri G S; Wolf S; Woodland LGenus two curves covering elliptic curves have been the object of study of many articles. For a ?xed degree n the subloci of the moduli space M_2 of curves having a degree n elliptic subcover has been computed for n=3,5 and discussed in detail for n odd; see [17, 22, 3, 4]. When the degree of the cover is even the case in general has been treated in [16]. In this paper we compute the sublocus of M_2 of curves having a degree 4 elliptic subcover.Item Use of Cu2O microcrystalline thin semiconductors for gas sensing(Technical sess., Institute of Physics, Sri Lanka, 2009) jayantha, P.A.P.; Perera, L.N.L.; Jayathileke, K.M.D.C.; Jayanetti, J.K.D.S.; Dissanayake, D.P.; Siripala, W.