STUDY ON KINETICS AND MECHANISM OF LeTID IN P-TYPE POLYSILICON PERC SOLAR CELL

Ji Fangxu; Zhou Chunlan; Cheng Shangzhi; Wang He; Yu Xunzhe; Wang Wenjing

doi:10.19912/j.0254-0096.tynxb.2020-1094

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (7) : 128-133. DOI: 10.19912/j.0254-0096.tynxb.2020-1094

STUDY ON KINETICS AND MECHANISM OF LeTID IN P-TYPE POLYSILICON PERC SOLAR CELL

Ji Fangxu^1,2, Zhou Chunlan^1,2, Cheng Shangzhi^1,2, Wang He^1,2, Yu Xunzhe^1,2, Wang Wenjing^1,2

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Abstract

Light and elevated temperature degradation （LeTID） is a non-negligible phenomenon of efficiency degradation in silicon solar cell. However, the exact mechanism of the degradation and the evolution process of related defect still need to be clarified. In this paper, we analyzed the evolution of degradation and regeneration under different light intensity in p-type multi-crystalline silicon passivated emitter and rear contact （PERC） solar cell. It shows that illumination accelerates the degradation and the regeneration reaction, but the decrease in light intensity improves the degradation degree. The result shows that there are two main defects inducing SRH （Shockley-Read-Hall） recombination in the bulk of silicon during the degradation-regeneration cycle. The deep level defect dominants SRH recombination in the bulk with ratio of electron to hole capture cross-sections k in the range of 33<k<37, and the shallow level defect with less influence during the whole cycle may be Fe—B complex with k value between 0.1 and 1.

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solar cells / polycrystalline silicon / degradation / carrier lifetime / light and elevated temperature degradation （LeTID） / PERC

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Ji Fangxu, Zhou Chunlan, Cheng Shangzhi, Wang He, Yu Xunzhe, Wang Wenjing. STUDY ON KINETICS AND MECHANISM OF LeTID IN P-TYPE POLYSILICON PERC SOLAR CELL[J]. Acta Energiae Solaris Sinica. 2022, 43(7): 128-133 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1094

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