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Solar selective absorbers enabled by single-chirality carbon nanotube films
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DOI：10.1016/j.ijthermalsci.2026.111240.png)
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Abstract
En 中文
Efficient solar–thermal energy conversion requires materials with high spectral selectivity and structural simplicity. In this study, we propose a chirality-engineered approach to realize solar selective absorbers using single-chirality carbon nanotube (CNT) films. Multilayer structures composed of a (10,3) CNT film, dielectric MgF2 layers, and a tungsten back-reflector layer were designed and optimized using the transfer matrix method to synergistically exploit excitonic absorption and optical interference. The optimized four-layer configuration achieved a figure of merit of 0.78, exhibiting strong solar absorptance in the visible–near-infrared region and suppressed emittance in the mid-infrared. Experimental reflectance spectra showed excellent agreement with simulations, confirming the reliability of the design. The results revealed that the selective absorption arises from the cooperative effects of excitonic resonances intrinsic to the (10,3) CNT film and interference within the proposed structures. This study demonstrates an optical design strategy for solar selective absorbers using chirality-controlled CNT films. The proposed multilayer structure provides a promising platform for spectrally selective solar absorbers and offers a basis for future investigations of practical solar–thermal energy conversion.
Keywords:
Single-chirality carbon nanotube (CNTs)
Spectral selectivity
Excitonic absorption
Solar selective absorber
Multilayer thin films
Interference effect
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