INFLUENCE OF SELECTNE EMITTER ON PERFORMANCE OF TOPCon SOLAR CELLS

Zhang Kangping; Sun Ya&#x02019;nan; Li Jiadong; Xu Xingxing; Liao Dongjin; Huang Zhiping

doi:10.19912/j.0254-0096.tynxb.2024-1642

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (1) : 48-54. DOI: 10.19912/j.0254-0096.tynxb.2024-1642

INFLUENCE OF SELECTNE EMITTER ON PERFORMANCE OF TOPCon SOLAR CELLS

Zhang Kangping¹, Sun Ya’nan¹, Li Jiadong¹, Xu Xingxing¹, Liao Dongjin², Huang Zhiping^1,2

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Abstract

In this study, the effects of laser power on emitter doping, dark saturation current, contact resistivity, and electrical performance were investigated. The findings demonstrate that with an increase in laser power output ratio from 73% to 78%, the overall doping concentration gradually rises within the selective emitter region, resulting in a sheet resistance difference of 145-150 Ω/□ compared to lightly doped regions. Effective minority carrier lifetime, iV_oc （implied open-circuit voltage）, and contact resistivity significantly decrease with higher impurity concentration overall, while dark saturation current was greatly impacted by surface doping concentration. Consequently, the utilization of a selective emitter can effectively reduce the overall doping concentration and elevate the sheet resistance within the light absorption region, achieving higher minority carrier lifetime and a open-circuit voltage. When the laser power output ratio was adjusted to 75%, a dark saturation current density of 17.68 fA/cm² and a contact resistivity of 1.34 Ωcm² were obtained, meanwhile optimum cell performance was achieved： open-circuit voltage of 723.79 mV, fill factor of 84.58%, and power conversion efficiency of 25.51%.

Key words

solar cells / selective emitter / doping concentration / sheet resistance dark saturation current density / contact resistivity / cell performance

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Zhang Kangping, Sun Ya’nan, Li Jiadong, Xu Xingxing, Liao Dongjin, Huang Zhiping. INFLUENCE OF SELECTNE EMITTER ON PERFORMANCE OF TOPCon SOLAR CELLS[J]. Acta Energiae Solaris Sinica. 2026, 47(1): 48-54 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1642

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