研究目的
Investigating the efficiency of a thermophotovoltaic (TPV) system through the spectral selectivity and stability of an emitter operating at temperatures in excess of 1000 °C.
研究成果
The study demonstrates that a robust TiAlN layer coupled to dielectric layers is essential to further improve the useful power density. High-temperature treatment of these multilayer stacks results in very small changes to the dielectric layers and relatively minor changes to the rearrangement of the chemical environment surrounding Ti atoms in the TiAlN layer, allowing reliable prediction and reasonable stabilization of the optical properties.
研究不足
The study does not account for angle dependence in some calculations. Future studies may include the potential for change in chemical compositions and optical properties in response to systematic changes of atmosphere at high temperature as well as longer term study of component stability.
1：Experimental Design and Method Selection:
The study involves computational design and experimental demonstration of a novel selective emitter based on multilayer nanostructures. A genetic algorithm was used to identify high-performing structures.
2：Sample Selection and Data Sources:
Samples were fabricated via plasma-enhanced atomic layer deposition (PEALD) using a commercial ALD system. Polycrystalline W substrates were used for PEALD.
3：List of Experimental Equipment and Materials:
Equipment includes a Cary 5000 spectrometer, Nicolet 6700 spectrometer, D8 Discover A25 (Bruker), TS1500 (Linkam Scientific), and Thermo Scientific K-Alpha system. Materials include TiAlN, Al2O3, HfO2, and W metal foil.
4：Experimental Procedures and Operational Workflow:
Samples were annealed at different temperatures and times, and their relectance spectra were measured. Thermal emission measurements were conducted using a Nicolet 6700 spectrometer.
5：Data Analysis Methods:
The Transfer Matrix Method was used to compute the reflection, transmission, and emissivity. The software package WPTherml was used for calculations of the optical properties and figures of merit.
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