The emergence of indoor electronic devices for internet of things (IoT) has motivated the scientific community to develop photovoltaic devices that can efficiently convert indoor light into electricity. In this paper, we report high-efficiency non-fullerene organic photovoltaic (OPV) cells with over 30% power conversion efficiency (PCE) under indoor conditions. Our results show that the choice of electron-transporting layer (ETL) is critically important to enable such performance. The use of an ETL (named PDI-NO) with a deep highest occupied molecular orbital (HOMO) level can effectively suppress leakage current and reduce trap-assisted recombination of the devices. Thus, using this ETL, we achieve record PCE of 31% by utilizing a low-band-gap acceptor in the bulk-heterojunction (BHJ) blend. Whereas, in another case, by employing a large-band-gap acceptor, a PCE of 26.7% with over 1V is achieved. Our study paves the way toward high-performance indoor OPV devices for powering IoT electronics.

用于物联网（IoT）的室内电子设备的出现激励了科学界开发能够有效地将室内光转化为电能的光伏设备。在本文中，我们报告了在室内条件下具有超过30％的功率转换效率（PCE）的高效非富勒烯有机光伏（OPV）电池。我们的结果表明，选择电子传输层（ETL）对于实现这种性能至关重要。使用具有最高的最高占据分子轨道（HOMO）水平的ETL（称为PDI-NO）可以有效地抑制泄漏电流并减少器件的陷阱辅助重组。因此，使用该ETL，我们通过在体-异质结（BHJ）共混物中使用低带隙受体实现了31％的PCE记录。而在另一种情况下，通过使用宽带隙受体，PCE达到26.7％，电压超过1V。我们的研究为向物联网电子设备供电的高性能室内OPV设备铺平了道路。