Kennedy, M.; Ahmed, H.; Doran, J.; Norton, B.; Daren, S.; Galindo , S.; Voz, C.; Puigdollers, J. Physica status solidi A. Applications and materials science (Print edition) Vol. 212, num. 1, p. 203-210 DOI: 10.1002/pssa.201431683 Data de publicació: 2015-01-01 Article en revista
Large Stokes shift downshifting organolanthanide complex, Eu(tta)(3)phen, is examined for inclusion in polymeric layers to replace the UV blocking layer in dye sensitized solar cell (DSSC) technology. The UV blocking layer increases stability but power conversion efficiency decreases as incident UV photons are not converted into photocurrent. Eu(tta) 3phen doped polymeric film are prepared and attached to DSSC devices following optimized thickness and concentration from a ray-trace numerical model for the specific DSSC. External quantum efficiency is significantly increased in the UV spectral region compared to DSSCs utilizing a passive, non-luminescent, UV-BL. High Eu(tta)(3)phen film transparency in the visible range minimizes DSSC EQE losses at visible wavelengths. Short-circuit current (I-sc) enhancement due to downshifting is demonstrated (similar to 1%) in small-scale DSSC prototypes, where the specific geometry limits the photon collection efficiency and overall enhancement. Model predictions indicate that 2%-3% I-sc enhancement is realizable in flexible single DSSC compared to, non-luminescent, UV-BL. Added to this, in outdoor conditions taking into account diffuse light, the increment in Isc can increase 50% more. Although photostability of the blended LSS-DS polymer films is not sufficient to be useful for medium-long term outdoor PV applications, the results demonstrate that significant efficiency enhancement can be realized. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Vikas, L.; Sanal, K.C.; Jayaraj, M.; Antony, A.; Puigdollers, J. Physica status solidi A. Applications and materials science (Print edition) Vol. 211, num. 11, p. 2493-2498 DOI: 10.1002/pssa.201431221 Data de publicació: 2014-11-01 Article en revista
Vertically aligned ZnO nanorod array (ZNA) was deposited by electrodeposition technique over glass substrate coated with Al doped ZnO (AZO). The photo-luminescence spectrum of the ZNA showed a near band edge emission and deep level emission (DLE). The resolved DLE spectrum indicates the formation of various defect levels within the band gap of ZnO. P-type CuO was deposited on ZNA to form ZNA/CuO heterojunction. The voltage-current (V-I) characteristics show a turn on voltage of 0.65V. The device showed good rectification behavior and a rectification ratio of 50 at 1V. The heterojunction with a device structure AZO/ZNA/CuO/Au showed good response on ultra violet (UV) illumination. The device has stability even after long exposures to atmospheric conditions and UV light.
Martinez, J.; Tamarit, J. Ll.; Pardo, L.; Del Barrio, M.; Rzoska, S.J.; Drozd-Rzoska, A. Physica status solidi A. Applications and materials science (Print edition) Vol. 208, num. 10, p. 2254-2257 DOI: 10.1002/pssa.201000726 Data de publicació: 2011-06-16 Article en revista
Gmucova, K.; Weis, M.; Pirriera, D.; Puigdollers, J. Physica status solidi A. Applications and materials science (Print edition) Vol. 206, num. 7, p. 1404-1409 DOI: 10.1002/pssa.200824459 Data de publicació: 2009-07 Article en revista
Trifonov, T.; Garin, M.; Rodriguez, A.; Marsal, L.; Alcubilla, R. Physica status solidi A. Applications and materials science (Print edition) Vol. 204, num. 10, p. 3237-3242 DOI: 10.1002/pssa.200622537 Data de publicació: 2007-10 Article en revista
Macroporous silicon membranes, prepared by photo-electrochemical etching, were subjected to pore widening performed by multiple oxidation/oxide-stripping cycles. We study the dependence of pore cross section and diameter on the oxidation parameters. The anisotropy of the oxidation process allows us to correct the faceted pore shape after the etching and to obtain pores with circular cross section. The shown post-treatment of macroporous silicon extends the possibilities of the electrochemical etching process to produce structures with a desired geometry.
Macanás, J.; Farre, M.; Muñoz, M.; Alegret, S.; Muraviev, D. Physica status solidi A. Applications and materials science (Print edition) Vol. 203, num. 6, p. 1194-1200 DOI: 10.1002/pssa.200566167 Data de publicació: 2006 Article en revista
Nanomaterial-based sensing devices attract great attention of scientist and technologists due to the special properties of nano-objects, such as for example, Metal Nanoclusters (MNC), which differ from those of the bulk materials. The further development of these devices requires novel approaches to stabilize MNC and therefore, to save their unique properties. The Solid-Phase-Incorporated-Reagents (SPHINER) technique was used for in situ synthesis of Polymer-Stabilized Metal Nanoclusters (PSMNC), which were used in the construction of new composite electrodes. The size of Pt-PSMNC synthesized in polyvinyl chloride (PVC) and polysulfone stabilizing matrices was determined by Transmission Electron Microscopy (TEM) technique and appeared to be in majority of cases of 6–20 nm. The electrochemical characterization of PSMNC-based amperometric sensors has demonstrated that inclusion of Pt-MNC increases the electrical conductivity of the membrane and that the electrode performance strongly depends on both the type of polymeric matrix and the membrane preparation technique.