针对N型IBC太阳电池中背结模型的建立及优化

THE ESTABLISHMENT AND OPTIMIZATION OF REAR EMITTER MODEL FOR N-TYPE IBC SOLAR CELLS

在N型衬底上制作2 cm×2 cm的双面太阳电池片,并对电池的正反面进行I-V、量子效率、掺杂形貌测试。通过将结果导入到PC1D中并拟合内量子效率,建立N型背结太阳电池的模型。通过调整背结太阳电池模型中串并联电阻、衬底寿命、表面复合速率、前表面场等参数,发现串联电阻与前表面场掺杂浓度是N型背结太阳太阳电池设计的关键。将这两个参数进行优化,电池效率的增幅分别为19.7%与33.9%。最终将N型背结太阳电池效率优化到20.6%。

A bifacial solar cell was fabricated on N type silicon substrate. Double surfaces were tested to achieve their current voltage curve, reflectance, doping curve for boron and phosphorus, internal quantum efficiency （IQE） and external quantum efficiency （EQE）. Then, we put the some test results in PC1D to model this bifacial solar cell and compare the IQE and EQE of simulation and experimental results to ensure the accuracy of the model. By optimizing the model, serial resistance and front surface field （FSF） concentration were prove to be the key parameters for N type solar cell with emitter in rare surface. The amplification of efficiency is 19.7% and 33.9% for optimization serial resistance and FSF concentration in our model, respectively. The efficiency was finally increased to 20.6% in optimization model for N type solar cell with emitter in rare surface.