The formation and evolution of the gap states formed with increasing Cs concentration in thin 6P films are followed with ultraviolet photoemission spectroscopy (UPS) and indirectly with energy loss spectroscopy involving electronic transitions (EELS). Two distinct doping regimes are apparent, in the lower doping regime bipolaron-like (dianionic) states are formed 0.8 and 2.9 eV above the valence band maxima. In the higher doping regime, approaching Cs saturation, a 0.5 eV splitting in the gap states is observed which is attributed to interacting bipolaron states, and as such is a precursor to bipolaron band formation.