期刊
ACS PHOTONICS
卷 5, 期 7, 页码 2748-2754出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00508
关键词
thermophotovoltaics (TPV); spectral control; thin film; epitaxial lift-off; combined heat and power (CHP)
类别
资金
- National Science Foundation [IIP-1820395]
Thermophotovoltaic (TPV) systems are a promising technology for distributed conversion of high-temperature heat to electricity. To achieve high conversion efficiency, the transport of sub-bandgap radiation between the thermal emitter and PV cell should be suppressed. This can be achieved by recycling sub-bandgap radiation back to the emitter using a spectrally selective cell. However, conventional TPV cells exhibit limited sub-bandgap reflectance. Here we demonstrate thin-film In0.53Ga0.47As-based structures with high spectral selectivity, including record-high average sub-bandgap reflectance (96%). Selectivity is enabled by short optical paths through a high-quality material fabricated using epitaxial lift-off, high-reflectance back surfaces, and optimized interference. In addition, we use a parallel-plate TPV model to evaluate the impact of specific structural features on performance and to optimize the cell architecture. We show that a dielectric spacer between InGaAs and the Au back surface is an important feature that enables a predicted TPV efficiency above 50% (with a power output of 2.1 W/cm(2)), significantly higher than current TPV devices. This work provides guidelines for the design of high-efficiency, low-cost TPV generators.
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