Broadband perfect absorbers in the visible region have attracted considerable attention in many fields, especially in solar thermophotovoltaic and energy harvesting systems. However, developing light absorbers with high absorptivity, thermal stability, and a broad bandwidth remains a great challenge. Here, we theoretically and experimentally demonstrate that a titanium nitride metasurface absorber exhibits broadband absorption with an average absorption of more than 92% over a wavelength range of 400 to 750 nm. The increase in absorption is attributed to the localized surface plasmon resonance (LSPR). We demonstrate the plasmon-enhanced visible-light-driven hydrogen production from water using a polymer photocatalyst integrated with a TiN metasurface absorber. A 300% increase in the hydrogen evolution rate was observed due to the LSPR that enhances the rates of light absorption, carrier separation, and hot-carrier transfer in polymer photocatalyst. These results enable a new approach to prepare high-efficiency solar energy harvesting systems.

中文翻译：

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使用氮化钛超表面宽带吸收器的等离子体增强太阳能驱动氢演化

可见光区的宽带完美吸收体在许多领域引起了广泛关注，特别是在太阳能热光伏和能量收集系统中。然而，开发具有高吸收率、热稳定性和宽带宽的光吸收剂仍然是一个巨大的挑战。在这里，我们从理论上和实验上证明了氮化钛超表面吸收剂表现出宽带吸收，在 400 到 750 nm 的波长范围内平均吸收率超过 92%。吸收的增加归因于局部表面等离子体共振 (LSPR)。我们展示了使用与 TiN 超表面吸收剂集成的聚合物光催化剂从水中产生等离子体增强的可见光驱动的氢气。由于 LSPR 提高了聚合物光催化剂中的光吸收、载流子分离和热载流子转移的速率，因此观察到析氢速率增加了 300%。这些结果为制备高效太阳能收集系统提供了一种新方法。