Fig. 1 Photo of a silicon wafer with a-Si:H/c-Si wafer solar cells, processed at HZB

Fig. 2a Structure of a (wafer-based) amorphous/crystalline heterojunction solar cell. For clarity, the usual surface texturization is omitted.

Fig. 2b Band structure of the TCO/(p,i)a-Si:H/(n)c-Si-heterojunction. ΔEV, ΔEC are the band offsets at the heterocontact, Dit denotes interface defects.