We use a single-chirality (6,5) semiconducting Single-Walled Carbon Nanotubes (SWCNTs) as the active layer of a planar SWCNT-fullerene heterojunction solar cell and a polydimethylsiloxane (PDMS) stamping process is applied to transport the active SWCNT layer onto the substrate. The lowest unoccupied molecular orbital (LUMO) band offset between (6,5) SWCNTs (donor) and fullerene (acceptor) is larger than the exciton binding energy (0.2-0.3 eV) of photogenerated electron-hole pairs in nanotube, therefore, excitons can be separated and the charges can be easily transferred. One-dimensional structure SWCNTs can either be used as absorbers or additives of existing organic solar cells because of its high mobility of electrons and holes. Early work in bulkheterojunctions focused on SWCNTs as acceptors which have larger electron affinity than polymers. Recent SWCNTs-fullerene solar cells have utilized semiconducting SWCNT as the donor material. However, SWCNT-solar cells feature low performance that associated with the presence of metallic SWCNT impurities, trap states due to multi-chirality SWCNT and SWCNTs aggregation. In this study, we investigate the thin film solar cell composed of fullerene, high purity (6,5) SWCNTs, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate PEDOT:PSS on an ITO electrode.