Physics
Permanent URI for this collectionhttp://repository.kln.ac.lk/handle/123456789/3750
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Item Electrocatalytic activity of nanocubic and microcrystalline Cu2O electrodes for glucose oxidation(Sri Lanka Association for the Advancement of Science, 2016) Jayasinghe, J.L.K.; Jayathilaka, K.M.D.C.; Kaumal, M.N.; Dissanayake, D.P.; Jayanetti, J.K.D.S.Item Surface treatment of electrodeposited n-type Cu2O thin films for applications in Cu2O based devices(2014) Jayathilaka, K.M.D.C.; Kapaklis, V.; Siripala, W.; Jayanetti, J.K.D.S.Item Electrodeposited chlorine doped cuprous oxide thin films for gas sensing applications(Sri Lanka Association for the Advancement of Science, 2013) Bandara, K.N.D.; Jayathileka, K.M.D.C.; Dissanayake, D.P.; Siripala, W.; Jayanetti, J.K.D.S.Item Enhancement of the photovoltaic conversion efficiency of electrodeposited p-n homojunction cuprous oxide solar cells by surface passivation(Sri Lanka Association for the Advancement of Science, 2013) Jayathileka, K.M.D.C.; Kapaklis, V.; Siripala, W.; Jayanetti, J.K.D.S.Item Fabrication and characterization of electrodeposited CuO/Cu2O heterojunction solar cells(Sri Lanka Association for the Advancement of Science, 2013) Jayathileka, K.M.D.C.; Kapaklis, V.; Siripala, W.; Jayanetti, J.K.D.S.Item Photocurrent enhancement of electrodeposited Cl doped cuprous oxide thin films on Ti substrates by annealing(Sri Lanka Association for the Advancement of Science, 2012) Jayathileka, K.M.D.C.; Kapaklis, V.; Siripala, W.; Jayanetti, J.K.D.S.Item Electrodeposited nano-crystalline cuprous oxide thin films for gas sensing applications(Sri Lanka Association for the Advancement of Science, 2012) Bandara, K.N.D.; Jayathileka, K.M.D.C.; Siripala, W.; Dissanayake, D.P.; Jayanetti, J.K.D.S.Item Construction of Cu2O Thin Film based Light Detector(Proc. 28th Technical Sess. of Institute of Physics, Sri Lanka, 2012) Kalubowila, K.D.R.N.; Jayathilaka, K.M.D.S.; Siripala, W.; Jayanetti, J.K.D.S.Item Electrodeposited nano-crystalline cuprous oxide thin films for solar energy applications(Annual Research Symposium, University of Kelaniya., 2012) Jayathileke, K.M.D.C.; Siripala, W.; Jayanetti, J.K.D.S.Cuprous oxide thin films were electrodeposited in a cupric acetate bath and resulting films were investigated in a photo-electrochemical cell to determine the intrinsic defects density variations. It was observed that by controlling the pH value of the deposition bath, density of both Cu and O vacancies which are responsible for acceptor and donor levels respectively, can be controlled and thereby it is possible to electrodeposit either n-type or p-type cuprous oxide thin films. The study reveals that not only the pH value but also the cupric ion concentration of the acetate bath determines the nature of conductivity of the films. Structural and morphological studies revealed that nano-crystalline films of size, 100 nm, can be electrodeposited by controlling the deposition parameters. These films will be very useful in applications of solar energy converting devices.Item Ammonium sulfide surface treatment of electrodeposited p-type cuprous oxide thin films(Electronic Materials Letters, 2014) Jayathileke, K.M.D.C.; Kapaklis, V.; Siripala, W.; Jayanetti, J.K.D.S.The effects of ammonium sulfide surface treatment on electrodeposited p-type polycrystalline cuprous oxide (Cu2O) thin films deposited on Ti substrates were studied. The structural and morphological properties of the films were investigated using scanning electron microscopy, x-ray diffraction, and energy-dispersive x-ray spectroscopy. The changes in the conductivities and photocurrents of the films after the ammonium sulfide treatment were determined. Films that had undergone the ammonium sulfide treatment showed reduced resistivities, enhanced spectral photoresponses, and enhanced current-voltage characteristics. The results showed that ammonium sulfide treatment improved the peak output current of the p-type Cu2O films by about 400% compared with those of bare Cu2O films. This improvement is attributed to the passivation of defects in the films by sulfur, showing that sulfur passivation provides a good method for improving of Cu2O-based devices.