The invention discloses a production technology of an all-back
electrode solar battery. The production technology comprises the steps of: (1) forming a back n+
diffusion layer area and a back p+
diffusion layer area, which are arranged in a finger-crossed manner, on the back surface of a
n type silicon substrate, and forming a front surface n+
diffusion layer on the front surface of the
n type silicon substrate; (2) carrying out annealing oxidation treatment on the
n type silicon substrate to form an
oxide layer; (3) deposing
passivation layers on the front surface and the back surface of the n type
silicon substrate, and deposing a reflection increasing film on the
passivation layer on the front surface; and (4) printing conductive
slurry on the back
passivation layer, after
sintering, forming contact electrodes respectively on the back p+
diffusion layer area and the back n+
diffusion layer area, and finishing the preparation of the all-back
electrode solar battery. According to the invention, the single conductive
slurry is printed on the passivation
layers of the back p+
diffusion layer and the back n+ diffusion layer at the same time, the finger-crossed conductive electrodes low in
contact resistance are formed on the p+ diffusion layer and the n+ diffusion layer after the
sintering, the production technology of the IBC battery is simplified, and the production cost of the IBC battery is lowered.