On-site measurement of limiting subcell in multijunction solar devices

It is well known that the response of any photovoltaic solar cell is dependent on the spectral characteristics of the incident radiation. This dependency is crucial in the output characteristics of a multijunction (MJ) cell where the spectral composition of the radiation determines the overall photocurrent produced, as either the top or the middle subcell will be limiting its response. The current mismatching between top and middle subcell is translated into energy losses, affecting the yield of the system. For research and commercial purposes it is interesting to measure accurately the incident solar radiation on a MJ cell, in terms of its spectral composition. This measurement will allows us to determine the photocurrent generated in each band of the multijunction device. Nowadays, the only way of measuring the photocurrent generated by each subcell is done with isotype cells or with spectroradiometers but there is no device capable of directly measuring each subcell photocurrent. In this paper it is described a device based on a commercial multijunction solar cell that is capable of measuring the direct irradiance for the top and middle bands thus it offers information of the limiting subcell (top or middle) in outdoors conditions

Divulgación de proyectos de energía solar fotovoltaica de la provincia de Jaén en Internet

El trabajo presentamos ha consistido en la realización de una Web para la red Internet, con el fin de dar a conocer algunos de los diferentes proyectos en el área de la energía solar fotovoltaica que se están realizando en la provincia de Jaén, fruto del esfuerzo de participación de diferentes organismos: Empresas del ramo, Ayuntamiento, Diputación Provincial, Universidad, Instituto de Estudios Giennenses. Web es el nombre que se ha dado a un gran conjunto de información a la que se puede acceder a través de Internet. Esta información se encuentra organizada en páginas web, y cada página puede contener, texto, imágenes, sonido, vídeo, además de otros elementos [1]