Indoor photovoltaics (IPVs) have attracted increasing attention for sustainably powering Internet of Things (IoT) electronics. Sb₂S₃ is a promising IPV candidate material with a bandgap of ~1.75 eV, which is near the optimal value for indoor energy harvesting. However, the performance of Sb₂S₃ solar cells is limited by nonradiative recombination, which is dependent on the quality of the absorber films. Additive engineering is an effective strategy to fine tune the properties of solution-processed films. This work shows that the addition of monoethanolamine (MEA) into the precursor solution allows the nucleation and growth of Sb₂S₃ films to be controlled, enabling the deposition of high-quality Sb₂S₃ absorbers with reduced grain boundary density, optimized band positions, and increased carrier concentration. Complemented with computations, it is revealed that the incorporation of MEA leads to a more efficient and energetically favorable deposition for enhanced heterogeneous nucleation on the substrate, which increases the grain size and accelerates the deposition rate of Sb₂S₃ films. Due to suppressed carrier recombination and improved charge-carrier transport in Sb₂S₃ absorber films, the MEA-modulated Sb₂S₃ solar cell yields a power conversion efficiency (PCE) of 7.22% under AM1.5 G illumination, and an IPV PCE of 17.55% under 1000 lux white light emitting diode (WLED) illumination, which is the highest yet reported for Sb₂S₃ IPVs. Furthermore, we construct high performance large-area Sb₂S₃ IPV minimodules to power IoT wireless sensors, and realize the long-term continuous recording of environmental parameters under WLED illumination in an office. This work highlights the great prospect of Sb₂S₃ photovoltaics for indoor energy harvesting.

室内光伏 (IPV) 为物联网 (IoT) 电子产品提供可持续供电已引起越来越多的关注。 Sb ₂ S ₃是一种很有前途的IPV候选材料，其带隙约为1.75 eV，接近室内能量收集的最佳值。然而，Sb ₂ S ₃太阳能电池的性能受到非辐射复合的限制，这取决于吸收膜的质量。增材工程是微调溶液加工薄膜性能的有效策略。这项工作表明，在前驱体溶液中添加单乙醇胺（MEA）可以控制Sb ₂ S ₃薄膜的成核和生长，从而能够沉积高质量的Sb ₂ S ₃吸收剂，并具有降低的晶界密度、优化的能带位置，并增加载流子浓度。补充计算表明，MEA 的加入导致更有效、更有利的沉积，从而增强基底上的异质成核，从而增加晶粒尺寸并加速 Sb ₂ S ₃薄膜的沉积速率。由于Sb ₂ S ₃吸收膜中载流子复合受到抑制并改善了载流子传输，MEA调制的Sb ₂ S ₃太阳能电池在AM1.5 G照明下产生了7.22%的功率转换效率（PCE），并且IPV在 1000 勒克斯白光发光二极管 (WLED) 照明下，PCE 为 17.55%，这是迄今为止 Sb ₂ S ₃ IPV 报道的最高值。 此外，我们构建了高性能大面积Sb ₂ S ₃ IPV微型模块为物联网无线传感器供电，并实现了办公室WLED照明下环境参数的长期连续记录。这项工作凸显了Sb ₂ S ₃光伏发电在室内能量收集方面的巨大前景。