This dissertation describes the synthesis and characterization of several types of fullerene polyadducts including: 6,9,12,15,18-pentakisorgano-1-hydro[60]fullerenes, 6,9,12,15-tetrakisorgano[60]fullerenes, and 1,4-bisbenzyl[60]fullerenes as well as the performance of several in photovoltaic devices. Several of these projects are collaborations with material scientists and some are original research projects.