Broadband perfect absorbers have been intensively researched for decades because of their near-perfect absorption optical property that can be applied to diverse applications. Unfortunately, achieving large-scale and heat-tolerant absorbers has been remained challenging work because of costly and time-consuming lithography methods and thermolability of materials, respectively. Here, we demonstrate a thermally robust titanium nitride broadband absorber with >95% absorption efficiency in the visible and near-infrared region (400–900 nm). A relatively large-scale (2.5 cm × 2.5 cm) absorber device is fabricated by using a fabrication technique of multiple-patterning colloidal lithography. The optical properties of the absorber are still maintained even after heating at the temperatures >600 ^∘C. Such a large-scale, heat-tolerant, and broadband near-perfect absorber will provide further useful applications in solar thermophotovoltaics, stealth, and absorption controlling in high-temperature conditions.

几十年来，宽带完美吸收体因其近乎完美的吸收光学特性而得到深入研究，可应用于多种应用。不幸的是，由于昂贵且耗时的光刻方法和材料的热稳定性，实现大规模和耐热吸收器仍然是一项具有挑战性的工作。在这里，我们展示了一种耐热性强的氮化钛宽带吸收剂，在可见光和近红外区域（400-900 nm）具有 >95% 的吸收效率。通过使用多图案胶体光刻的制造技术制造了相对大尺寸（2.5 cm × 2.5 cm）的吸收器装置。即使在 >600 ^∘的温度下加热后，吸收体的光学特性仍然保持不变 C. 这种大规模、耐热、宽带近乎完美的吸收体将在太阳能热光伏、隐身和高温条件下的吸收控制方面提供进一步的有用应用。