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

有三种途径可能使III-V多结太阳能电池（MJSC）器件的限制电池中的电流收集均匀化并增加电流收集-一种是通过生长顶部电池的较小有源区域，另一种是通过使用薄膜钙钛矿的电侧壁钝化，以及另一种是通过使用具有非晶热塑性膜的全无机钙钛矿量子点（PQD）对MJSC中的分流缺陷进行光钝化。实验观察到电侧壁钝化使子电池中的电流收集均匀化并增加电流收集，从而受益于发光耦合（LC）效应。因此，完全MJSC器件的电侧壁钝化是在制造具有均匀电流产生的高效MJSC中推荐的附加步骤，就在半导体堆叠的制造之后或在电极制造之后，只要在钝化层生长期间电极被掩蔽。全III-V MJSC器件上的PQD-非晶热塑性薄膜成功地证明了从顶部电池到其下部子电池的电流再分布。因此，为了增强MJSC电流匹配，建议使用优化的光辅助层，如PQD-非晶热塑性薄膜。应用这些解决方案可以使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.