Orthogonal experimental method was used to optimize the electrical injection regeneration conditions of boron-doped p-type monocrystalline silicon PERC solar cells to decrease their LID (light induced degradation) effects. The variation of efficiencies of the PERC solar cells before and after regeneration and during the subsequent 12 h LID was measured by a VS-6821M solar cell I-V tester

and the ratio of the efficiency after 12 h LID to the initial efficiency before regeneration was used as the standard for discerning good regeneration condition from bad one. Threelevel orthogonal experimental results show that whether the interaction is considered or not

the optimal regeneration conditions are both 30 min

170 ℃

18 A under the studied parameter range (10-30 min，140-200 ℃，6-18 A). On this basis

the optimal regeneration condition was further optimized to 30 min

175 ℃

18 A by using five-level orthogonal experiments. The efficiency of a PERC solar cell regenerated using the optimal processing condition increases by 1%-2% relative to the initial value before regeneration

and remains stable in the following 12 h light soaking at 1 Sun light intensity and 45 ℃

and the efficiency after 12 h LID process is still about 1% higher than the initial efficiency.