0000000000617465
AUTHOR
Juan Jiménez
Photoluminescence Imaging and LBIC Characterization of Defects in mc-Si Solar Cells
Today’s photovoltaic market is dominated by multicrystalline silicon (mc-Si) based solar cells with around 70% of worldwide production. In order to improve the quality of the Si material, a proper characterization of the electrical activity in mc-Si solar cells is essential. A full-wafer characterization technique such as photoluminescence imaging (PLi) provides a fast inspection of the wafer defects, though at the expense of the spatial resolution. On the other hand, a study of the defects at a microscopic scale can be achieved through the light-beam induced current technique. The combination of these macroscopic and microscopic resolution techniques allows a detailed study of the electric…
Non-radiative recombination centres in catalyst-free ZnO nanorods grown by atmospheric-metal organic chemical vapour deposition
We have investigated the cathodoluminescence (CL) emission and the Raman spectra along individual ZnO nanorods grown by a catalyst-free method. The spatial correlation between the CL emission and the defect related Raman modes permits establishing a correspondence between the non-radiative recombination centres (NRRCs) and the defects responsible for the 275 cm−1 Raman band. According to this relation, the NRRCs in these nanorods are tentatively associated with complexes of zinc interstitials.
Conocer la distribución de la flora valenciana: Gonzalo Mateo y el Banco de Datos de Biodiversidad de la Comunidad Valenciana
El Banco de Datos de Biodiversidad de la Comunitat Valenciana (BDBCV) alberga información fundamental para conocer la distribución regional de la biota silvestre. De toda ella, la flora vascular es, sin duda, el grupo mejor caracterizado, ya que representa el 76% de los más de 2 millones de referencias acumulada actualmente en la base de datos. Entre los observadores vinculados al BDBCV, Gonzalo Mateo destaca por el volumen de citas aportadas. Este trabajo valora su contribución al conocimiento corológico de la flora vascular valenciana a través de esta plataforma digital de conocimiento y comunicación.
Non radiative recombination centers in ZnO nanorods
ABSTRACTNowadays, the nature of the non radiative recombination centres in ZnO is a matter of controversy; they have been related to extended defects, zinc vacancy complexes, and surface defects, among other possible candidates. We present herein the optical characterization of catalyst free ZnO nanorods grown by atmospheric MOCVD by microRaman and cathodoluminescence spectroscopies. The correlation between the defect related Raman modes and the cathodoluminescence emission along the nanorods permits to establish a relation between the non radiative recombination centers and the defects responsible for the local Raman modes, which have been related to Zn interstitial complexes.
Planes de recuperación de flora amenazada de la comunidad valenciana. Resultados tras tres años de la aprobación de la normativa legal
The Valencian Community (Spain) holds three plant species (Cistus heterophyllus Desf., Limonium perplexum L. Sáez & Rosselló and Silene hifacensis Rouy ex Willk.) listed into the category In danger of extinction, for which there is a joint Recovery Plan passed by the Valencian Government through the Order 1/2015, January 8, of the Department of Infrastructures, Land and Environment. Among the aims of this Recovery Plan, to improve the conservation status of these species in the Valencian territory, provisions of its Article 3 are highlighted. This article specifies that they population values that justify their passage of the category In danger of extinction to Vulnerable must be reached. T…
Spray pyrolytic deposition of ZnO thin layers composed of low dimensional nanostructures
Abstract ZnO nanolayers composed of fine nanostructures have been successively grown by spray pyrolytic deposition at 300 ∘ C over amorphous glass substrates. As deposited samples were analysed by scanning electron microscopy (SEM), showing a granular morphology with grain size in the limit of the microscope resolution. CL measurement shows a broad near band edge (3.4 eV) emission of ZnO in the UV region and the defect level emissions in the green region of the spectrum. The use of intermittent spray pyrolytic deposition is shown as an alternative to increase the homogeneity of the samples when temperatures near to the precursor pyrolytic decomposition is selected, long depositions times a…
Plant micro-reserves in Valencia (E. Spain): A model to preserve threatened flora in China?
The Valencian Community (eastern Spain) was the pioneer territory establishing plant micro-reserves (PMRs). Its model to protect small sites for endemic and endangered plants has been exported to several countries around the globe. This paper highlights 1) the role of PMRs to complement the protection provided by large protected areas, 2) how the establishment of PMRs fosters the increase of floristic knowledge, and 3) the fact that continuous monitoring of PMRs also yields new records of endangered species found within the same PMRs. The flexibility of the PMR approach -it can be adapted to other national and regional legislations- allows its transfer to other rich-biodiversity regions and…