Optimization of high-efficiency multi-junction solar cells through homogeneous luminescent coupling effect

在III-V多结太阳能电池(MJSC)器件的极限电池中，有三种可能的方法来均化和增加电流收集-一种是通过生长较小的顶部电池的有源区，另一种是通过使用薄膜介质的电侧壁钝化，另一种是使用带有非晶态热塑性薄膜的全无机钙钛矿量子点(PQD)来对MJSC中的并联缺陷进行光钝化。实验观察到，利用发光耦合(LC)效应，电侧壁钝化可以均匀和增加子电池中的电流收集。因此，如果在钝化层生长期间掩蔽电极，则在半导体叠层制造之后或电极制造之后，在制造具有均匀电流生产的高效MJSC时，建议对全MJSC器件的电侧壁钝化是额外的步骤。在一个完整的III-V MJSC器件上的PQD-非晶态热塑性薄膜成功地显示了电流从顶层单元到下层亚单元的重新分布。因此，为了增强MJSC的电流匹配，建议使用优化的光助层，如PQD-非晶态热塑性薄膜。应用这些解决方案，可使MJSC的转换效率提高1.35%。

There are three pathways to possibly homogenize and increase current collection in a limiting cell of a III-V multijunction solar cell (MJSC) device - one is by growing smaller active area of the top cell, another is by electrical sidewall passivation using thin-film dielectrics, and the other is by photo-passivation of shunt defects in MJSCs using all-inorganic perovskite quantum dots (PQDs) with amorphous thermoplastic film. The electrical sidewall passivation was experimentally observed to homogenize and increase current collection in a subcell benefitting from the luminescent coupling (LC) effect. Hence, the electrical sidewall passivation of full MJSC devices is an additional step recommended in fabricating high-efficiency MJSCs with homogeneous current production, just after the fabrication of the semiconductor stack or after electrode fabrication, provided that the electrodes are masked during passivation layer growth. The PQD-amorphous thermoplastic films on a full III-V MJSC device successfully demonstrated current redistribution from the top cell into its lower subcells. Thus, for enhanced MJSC current matching, it is recommended to use an optimized photo-assistive layer like PQD-amorphous thermoplastic films. Applying these solutions may reach the conversion efficiency increase by 1.35% in MJSCs.