Broadband perfect absorbers are of great importance for various applications such as stealth technologies, thermal photovoltaic cells, optical communication, photodetection, and photovoltaic devices. However, they are often made by lithographic techniques with high cost and complexity, which hinders their practical applications. The design of broadband and ultrahigh absorber at low cost and ease in fabrication is still a big challenge in the field of optics. Here, an all‐solution‐processed plasmonic perfect absorber is proposed and demonstrated by incorporating Mxene Ti₃C₂T_x (T_x = F, O or OH) and gold nanoparticles (NPs) in metal–insulator–metal configuration. The absorption of the designed plasmonic absorber can reach up to 99% with polarization‐ and angle‐independence in a broad range of wavelengths from ultraviolet to near‐infrared region. This ultrahigh and broadband absorbance is attributed to the synergy of plasmon resonance, magnetic resonance, and cavity effect between gold NPs layer and Mxene film, which is further corroborated by simulations of the finite element method for both random and patterned orientation of the gold nanoparticles. The excellent optical property together with the easy fabrication method paves the way for preparing photon‐absorbing nanostructures in photocatalysis and solar photovoltaics.

中文翻译：

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基于甲苯-金纳米粒子的全溶液处理超高宽带和广角完美吸收体

宽带完美吸收体对于各种应用（例如隐身技术，热光伏电池，光通信，光电检测和光伏设备）非常重要。然而，它们通常是通过光刻技术以高成本和复杂性来制造的，这阻碍了它们的实际应用。低成本和易于制造的宽带和超高吸收体的设计仍然是光学领域的一大挑战。在这里，全溶液处理的等离激元吸收完美提出并展示了通过掺入钛Mxene ₃ c ^ ₂ Ť _X（T _X  = 楼 O或OH）和金纳米粒子（NPs）的金属-绝缘体-金属构造。设计的等离激元吸收器在从紫外线到近红外区域的广泛波长范围内，具有偏振和角度独立性，吸收率可高达99％。这种超高和宽带的吸收归因于等离子共振，磁共振以及金纳米颗粒层和Mxene膜之间的腔效应的协同作用，这通过金纳米粒子的随机和图案取向的有限元方法模拟得到进一步证实。优异的光学性能以及易于制造的方法，为光催化和太阳能光伏中光子吸收纳米结构的制备铺平了道路。