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Space solar cells radiation hardness is of fundamental importance in view ofthe future missions towards harsh radiation environment (like e.g. missions toJupiter) and for the new spacecraft using electrical propulsion. In this paperwe report the radiation data for triple junction (TJ) solar cells and relatedcomponent cells. Triple junction solar cells, InGaP top cells and GaAs middlecells degrade after electron radiation as expected. With proton irradiation, ahigh spread in the remaining factors was observed, especially for the TJ andbottom cells. Very surprising was the germanium bottom junction that showedvery high degradation after protons whereas it is quite stable againstelectrons. Radiation results have been analyzed by means of the DisplacementDamage Dose method and DLTS spectroscopy.

Displacement Damage dose and DLTS Analyses on Triple and Single Junction solar cells irradiated with electrons and protons