Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6457297 | Solar Energy Materials and Solar Cells | 2017 | 6 Pages |
•The nonmetal filler (TiN) is included into the SiO2 host to achieve the sunlight absorption.•The substrate effect on the thermal stability is investigated.•A stable solar absorptance of 94% with a super long-term thermal stability up to 700 °C is achieved in the spectrally-selective solar absorber deposited on lanthanum aluminate substrate.
Spectrally-selective solar absorber is required to be thermally stable at high operational temperature. However the currently available absorbers aren't stable beyond 700 °C. Here we explore a new absorber with cermet of TiN in SiO2 on LaAlO3 substrate that can be used for long term at 700 °C. The optimized cermets contain TiN with volume fraction of 60% and 65% as sun-light absorption media, SiO2 as anti-reflection coating (ARC), and tungsten (W) as infrared (IR) reflection layer. The absorbers demonstrate an absorptance higher than ~95% before annealing and ~94% after annealing at 700 °C, which will be useful for especially concentrated solar applications.
Graphical abstractThe novel cermet with nonmetal inclusion in SiO2 host is successfully introduced in the cermet-based spectrally-selective solar absorber, which demonstrates a super long-term thermal stability up to 700 °C with a stable solar absorptance of 94%.Figure optionsDownload full-size imageDownload high-quality image (167 K)Download as PowerPoint slide