Further boosting the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) without excessively increasing production expenses is critical for practical applications. Here, we introduce silicon quantum dots (SiQDs) to enable perovskites to harvest additional sunlight without changing PSC processes. These SiQDs can convert shorter wavelength excitation light (300–530 nm) into visible region light and reflect longer wavelength perovskite-unabsorbed visible light (550–800 nm), leading to broadband light absorption enhancement in PSCs. As a result, the SiQD-based photocurrent gain can improve the external quantum efficiencies of PSCs over a wide wavelength range of 360–760 nm, yielding relatively enhanced short-circuit current density (+1.66 mA/cm²) and PCE (+1.4%). Surprisingly, even the PSC with a low-purity perovskite layer shows an ultrahigh PCE improvement of 5.6%. Our findings demonstrate QD-assisted effects based on earth-abundant and environmentally friendly silicon, leading to effective optical management that remarkably promotes the performance of PSCs and enables the balance of costs to be substantially addressed.

对于实际应用而言，在不过度增加生产成本的情况下进一步提高钙钛矿太阳能电池（PSC）的功率转换效率（PCE）至关重要。在这里，我们介绍了硅量子点（SiQDs），以使钙钛矿无需改变PSC工艺即可收获更多的阳光。这些SiQD可以将较短波长的激发光（300–530 nm）转换为可见光，并反射较长波长的钙钛矿未吸收的可见光（550–800 nm），从而导致PSC的宽带光吸收增强。结果，基于SiQD的光电流增益可以在360-760 nm的宽波长范围内提高PSC的外部量子效率，产生相对增强的短路电流密度（+1.66 mA / cm ²）和PCE（+ 1.4％）。令人惊讶的是，甚至具有低纯度钙钛矿层的PSC都显示出5.6％的超高PCE改善。我们的研究结果表明，基于富含地球和环保硅的QD辅助效果可实现有效的光学管理，从而显着提升PSC的性能，并能够显着解决成本平衡问题。