重点分析激光功率对发射区掺杂、电池暗饱和电流、接触电阻与电性能的影响。结果表明,当激光功率输出比从73%增至78%时,选择发射区整体掺杂浓度逐渐提高,与轻扩区形成145~150 Ω/©方阻差,有效少子寿命、iVoc、接触电阻率等随整体杂质浓度的提高明显下降,而暗饱和电流的大小则受表面杂质浓度的影响更大。因而选择发射极的使用,可通过提高光吸收区的方块电阻来降低整体掺杂浓度,从而提高少子寿命和高开路电压。当激光功率输出比为75%时,暗饱和电流密度为17.68 fA/cm2,接触电阻率为1.34 Ωcm2,获得最佳电池性能开路电压为723.79 mV、填充因子为84.58%、转换效率为25.51%。
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, iVoc （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%.
关键词
太阳电池 /
选择发射极 /
掺杂浓度 /
方块电阻 /
暗饱和电流密度 /
接触电阻率 /
电池性能
Key words
solar cells /
selective emitter /
doping concentration /
sheet resistance dark saturation current density /
contact resistivity /
cell performance
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