Wide applications of personal consumer electronics have triggered tremendous need for portable power sources featuring light-weight and mechanical flexibility. Perovskite solar cells offer a compelling combination of low-cost and high device performance. Here we demonstrate high-performance planar heterojunction perovskite solar cells constructed on highly flexible and ultrathin silver-mesh/conducting polymer substrates. The device performance is comparable to that of their counterparts on rigid glass/indium tin oxide substrates, reaching a power conversion efficiency of 14.0%, while the specific power (the ratio of power to device weight) reaches 1.96 kW kg(-1), given the fact that the device is constructed on a 57-μm-thick polyethylene terephthalate based substrate. The flexible device also demonstrates excellent robustness against mechanical deformation, retaining >95% of its original efficiency after 5,000 times fully bending. Our results confirmed that perovskite thin films are fully compatible with our flexible substrates, and are thus promising for future applications in flexible and bendable solar cells.

中文翻译：

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超薄柔性基板上的高效耐用钙钛矿太阳能电池。

个人消费电子产品的广泛应用引发了对具有轻便和机械灵活性的便携式电源的巨大需求。钙钛矿太阳能电池具有低成本和高设备性能的出色组合。在这里，我们演示了在高度柔性和超薄银网/导电聚合物基板上构建的高性能平面异质结钙钛矿太阳能电池。该器件的性能可与刚性玻璃/氧化铟锡衬底上的同类器件相媲美，功率转换效率达到14.0％，而比功率（功率与器件重量的比）达到1.96 kW kg（-1），考虑到该设备是在厚度为57μm的聚对苯二甲酸乙二醇酯基的基材上构建的。该柔性装置还表现出出色的抗机械变形能力，经过5,000次完全弯曲后，仍能保持其原始效率的95％以上。我们的结果证实钙钛矿薄膜与我们的柔性基板完全兼容，因此有望在将来在柔性和可弯曲太阳能电池中应用。