Triple-Cation-Based Perovskite Photocathodes with AZO Protective Layer for Hydrogen Production Applications
Triple-Cation-Based Perovskite Photocathodes with AZO Protective Layer for Hydrogen Production Applications
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DOI：
10.1021/acsami.9b04963
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发表时间：
2019-07-03
影响因子：
9.5
通讯作者：
De Volder, Michael
中科院分区：
文献类型：
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作者：
Ahmad, Shahab;Sadhanala, Aditya;De Volder, Michael
金属卤化物钙钛矿作为驱动太阳能燃料合成的光电极受到了人们的广泛关注。然而，目前这些光电阴极在水中的稳定性有限，这阻碍了它们的实际应用。在这里，我们报道了一种高性能的溶液可加工光电阴极，它由铯甲酰胺、甲基铵、三阳离子卤化铅组成，由铝掺杂的氧化锌(AZO)层保护，并结合菲尔德的金属封装。仔细选择电荷传输层可以改善光电流、填充因子、器件稳定性和重复性。具有AZO层的器件的死像素数量从25%减少到6%，而在具有AZO层的光电阴极中，光电流密度增加了近20%，达到14.3 mA cm(-2)。此外，我们观察到含有AZO的光电阴极的器件寿命增加了5倍，在完全失效之前达到了18小时。最后，光电阴极是用低成本和可扩展的方法制造的，这些方法有望与标准的基于溶液的工艺兼容。
Metal halide perovskites are actively pursued as photoelectrodes to drive solar fuel synthesis. However, currently, these photocathodes suffer from limited stability in water, which hampers their practical application. Here, we report a high-performance solution-processable photocathode composed of cesium formamidinium methylammonium triple-cation lead halide perovskite protected by an Al-doped ZnO (AZO) layer combined with a Field's metal encapsulation. Careful selection of charge transport layers resulted in an improvement in photocurrent, fill factor, device stability and reproducibility. The dead pixels count reduced from 25 to 6% for the devices with an AZO layer, and in photocathodes with an AZO layer the photocurrent density increased by almost 20% to 14.3 mA cm(-2). In addition, we observed a 5-fold increase in the device lifetime for photocathodes with AZO, which reached up to 18 h before complete failure. Finally, the photocathodes are fabricated using low-cost and scalable methods, which have promise to become compatible with standard solution-based processes.