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High energy efficient and thermally stable solar selective absorber constructed with TiNxOy based multilayers

Solar selective absorbers are the most critical part of solar water heaters that can be integrated into architecture. A high-performance absorber with a solar absorptance α higher than 95% and an infrared emissivity ɛ below 4% is fabricated by sputtering using TiNxOy based multilayers. The highest absorptance is 97.5% and the corresponding energy utilization efficiency (α/ɛ) value is as high as 26.2. The absorber has excellent thermal stability that can maintain its property after heating at 400 °C for 100 hr in air. It can even be tempered on the glass substrate, which is of great significance for lowering the cost and expanding its applications.