Back of body knot N type solar cell and subassembly and system thereof

The utility model relates to a back of body knot N type solar cell and subassembly and system thereof. The utility model discloses a back of the body knot N type solar cell, including N type crystalline silica base member, the main schedule bread of N type crystalline silica base member is drawn together in proper order from inside to outside n+ and is mixed regional and positive surface passivation and subtract anti - membrane, the back of the body surface of N type crystalline silica base member is including from inside to outside p+ in proper order mix regional and back of the body surface passivation membrane, the front electrode is drawn together to the main schedule bread of N type crystalline silica base member, and the out -of -the -way surface of N type crystalline silica base member is provided with the back electrode and the trough - shaped structure that pierces through the passive film, the back electrode pack in trough - shaped structure and with the p+ regional ohmic contact of formation that m