Perovskite solar cells are a promising technology for emerging photovoltaic applications that require mechanical compliance and high specific power. However, the devices suffer from poor operational stability. Here we develop lightweight, thin (<2.5 μm), flexible and transparent-conductive-oxide-free quasi-two-dimensional perovskite solar cells by incorporating alpha-methylbenzyl ammonium iodide into the photoactive perovskite layer. We fabricate the devices directly on an ultrathin polymer foil coated with an alumina barrier layer to ensure environmental and mechanical stability without compromising weight and flexibility. We demonstrate a champion specific power of 44 W g⁻¹ (average: 41 W g⁻¹), an open-circuit voltage of 1.15 V and a champion efficiency of 20.1% (average: 18.1%). To show scalability, we fabricate a photovoltaic module consisting of 24 interconnected 1 cm² solar cells and demonstrate energy-autonomous operation of a hybrid solar-powered quadcopter, while constituting only 1/400 of the drone’s weight. Our performance and stability demonstration of ultra-lightweight perovskite solar cells highlight their potential as portable and cost-effective sustainable energy harvesting devices.

钙钛矿太阳能电池对于需要机械顺应性和高比功率的新兴光伏应用来说是一种很有前景的技术。然而，这些设备的运行稳定性较差。在这里，我们通过将α-甲基苄基碘化铵掺入光敏钙钛矿层中，开发出轻质、薄（<2.5 μm）、柔性且透明导电的无氧化物准二维钙钛矿太阳能电池。我们直接在涂有氧化铝阻挡层的超薄聚合物箔上制造器件，以确保环境和机械稳定性，同时不影响重量和灵活性。我们展示了 44 W g ⁻¹的冠军比功率（平均值：41 W g ^{− 1}）、1.15 V 的开路电压和 20.1% 的冠军效率（平均值：18.1%）。为了展示可扩展性，我们制造了一个由 24 个互连的 1 cm ²太阳能电池组成的光伏模块，并演示了混合太阳能四轴飞行器的能量自主操作，而其重量仅为无人机的 1/400。我们对超轻钙钛矿太阳能电池的性能和稳定性演示凸显了它们作为便携式且经济高效的可持续能量收集设备的潜力。