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科学通报  2014 

基于LambertW函数提取太阳电池五参数的方法及光强对参数影响的规律

DOI: 10.1360/N972014-00534, PP. 3615-3620

Keywords: 太阳电池,参数提取,光强,影响规律

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Abstract:

基于LambertW函数和多项式拟合,提出了一种太阳电池参数提取方法.该方法首先利用LambertW函数将电池电流输出超越方程显化后积分,得显化积分方程;其次,基于质点平抛运动轨迹与电池伏安特性曲线相似性,对曲线分3段进行拟合后积分,得分段积分方程;最后,根据测量值建立显化积分方程与分段积分方程相等的方程组,解析求解出电池光电流、理想因子、反向饱和电流、串联和并联电阻5个电性参数.结果表明该方法的均方根误差为0.0047A,平均绝对相对误差为0.94%;证明了该方法的正确性.该方法应用于变光强下磷化铟镓/砷化铟镓/锗(InGaP/InGaAs/Ge)三结太阳电池参数的提取,结果表明提取误差随着光强的增大而下降;原因是随着光强增大,噪声对测量的影响下降导致.且发现光电流随光强的增加而几乎线性增加,而理想因子、反向饱和电流、串联和并联电阻都随光强增加而下降;原因是当光强增加时,入射光子数线性增加、费米能级抬高、空间复合减少、分流路径增加导致的.

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