TOPCon太阳电池的UV辐照衰减特性及抗UV辐照方式研究

RESEARCH ON UV IRRADIATION ATTENUATION CHARACTERISTICS AND UV IRRADIATION RESISTANCE METHODS OF TOPCon SOLAR CELLS

对TOPCon太阳电池在不同紫外线(UV)辐照条件下的电性能衰减特性进行了研究,并对提高此类太阳电池抗UV辐照的方式进行了分析。研究结果表明:1)当UV辐照总量达到30 kWh/m2时,在太阳电池背面未盖光伏镀膜玻璃的情况下,TOPCon太阳电池的光电转换效率衰减幅度仅为0.2%左右;相同UV辐照总量下,在太阳电池正面未盖光伏镀膜玻璃情况下,此类太阳电池的光电转换效率衰减幅度却为5.4%~8.3%,表明太阳电池正面和背面的衰减机理可能存在差异,而UV辐照衰减更倾向于对太阳电池正面产生影响,分析原因在于太阳电池正面和背面的钝化方式有所不同,导致正面更容易受到UV辐照衰减的影响。2)在AlOx层厚度保持不变的情况下,当UV辐照总量为50 kWh/m2时,随着Si Nx层折射率从2.00增至2.20,TOPCon太阳电池的光电转换效率衰减幅度从4.03%降至1.22%,这是因为随着SiNx层折射率增加,短路电流、开路电压及填充因子的稳定性得到提升,从而实现了较低的光电转换效率衰减。3)在SiNx层折射率保持2.20不变的情况下,当UV辐照总量为50 kWh/m2时,随着Al Ox层厚度从3.0 nm增至4.8 nm,TOPCon太阳电池的光电转换效率衰减幅度从0.59%降至0.10%,这说明增加AlOx层厚度也可以有效提高太阳电池的抗UV辐照能力。4)提高SiNx层折射率和增加Al Ox层厚度相结合的方式对提高TOPCon太阳电池抗UV辐照能力有较为显著的效果。

This paper studies the electrical performance attenuation characteristics of TOPCon solar cells under different UV irradiation conditions,and analyzes ways to improve the resistance of such solar cells to UV irradiation.The research results show that:1)When the total amount of UV irradiation reaches 30 kWh/m2,the photoelectric conversion efficiency of TOPCon solar cell only decays by about 0.2%without PV coated glass on the back of the solar cell.Under the same total amount of UV irradiation,when the front of the solar cell is not covered with PV coated glass,the photoelectric conversion efficiency of this kind of solar cells decreases by 5.4%~8.3%.It show that there may be differences in the attenuation mechanism between the front and back of solar cells,and UV irradiation attenuation tends to have a greater impact on the front of solar cells.This may be due to the different passivation methods used on the front and back of solar cells,which makes the front more susceptible to UV radiation attenuation.2)When the thickness of the AlOx layer remains constant and the total amount of UV irradiation is 50 kWh/m2,as the refractive index of the SiNx layer increases from 2.00 to 2.20,the photoelectric conversion efficiency of TOPCon solar cells decreases from 4.03%to 1.22%.This is because as the refractive index of the SiNx layer increases,the stability of short-circuit current,open circuit voltage,and fill factor is improved,thereby achieving low photoelectric conversion efficiency attenuation.3)When the refractive index of the SiNx layer remains constant at 2.20 and the total amount of UV irradiation is 50 kWh/m2,as the thickness of the AlOx layer increases from 3.0 nm to 4.8 nm,the photoelectric conversion efficiency of TOPCon solar cells decreases from 0.59%to 0.10%.This indicates that increasing the thickness of the AlOx layer can also effectively improve the UV irradiation resistance of solar cells.4)The combination of increasing the refractive index of SiNx layer and increasing the thickness of AlOx layer has a significant effect on improving the UV irradiation resistance of TOPCon solar cells.