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CVD grown CNT thin film with a thickness greater than 10 μm behaves like a near-perfect blackbody absorber (ie, α/ε= 0.99/0.99). Whereas, for a thickness≤ 0.4 µm, the CNT based tandem absorber acts as a spectrally selective coating (ie, α/ε= 0.95/0.20). These selective coatings exhibit thermal stability up to 650 C in vacuum, which can be used for solar thermal power generation.