The invention relates to a
solar battery string, comprising more than two cells serially connected in stack form, where each
cell includes an aluminum back field, a back passivated layer, a polysilicon substrate, a positive passivated layer, an antireflective film, positive silver fingers and a positive
silver electrode which are arranged sequentially from bottom to top; in two cells serially connected in stack manner, the positive
silver electrode of the front
cell is connected with the aluminum back field of the rear
cell via conductive glue; in the cells serially connected in stack manner,a
busbar is connected with the aluminum back field of the first cell via conductive glue, and a
busbar is connected or directly welded to the positive
silver electrode of the last cell via conductiveglue. The
solar battery string herein has the advantages that the usage of back
silver paste can be decreased, the silkscreen printing process is simplified, and the material cost is low; the back silver electrodes are omitted while the conducting capacity is equivalent to that of the string having the back silver electrodes; conductive connection is reliable and stable; the passivated area of thealuminum back field is enlarged, so that
photon utilization efficiency is improved; in addition, the requirement on aligning precision of the stack process is lowered; gaps among the modules are utilized, and the cells that can be added under the same area are 13% and above more than those in conventional modules.