Application of Capacitance-based Techniques to the Characterization of Multijunction Solar Cells - Carmen María Ruiz; Ignacio Rey-Stolle Prado; Iván García Vara; Enrique Barrigón Montañés; Pilar Espinet González; Ernesto Saucedo; Verónica Bermúdez; Carlos Algora Del Valle (Conference Proceedings, 2009)