Abstract
Selective spectra of absorber and emitter have great effects on the solar thermophotovoltaic (STPV) performance. In this work, a systematic thermal analysis of the STPV system was conducted to optimize the selective absorber and emitter. For the ideal absorber and emitter, the maximum STPV efficiency can be achieved at the cutoff wavelength of 1.2 μm for the ideal absorber and emitted spectrum width of 1.0 μm for the ideal emitter. Increasing concentrated factor of solar radiation from 1 to 100 can enhance the total STPV efficiency from 10.4% to 20.3%, indicating that the large incident solar intensity can enhance the STPV efficiency. In addition, increasing ratios of length to gap (eg: l/d to be ~ 30) and length to width (eg: n to be ~ 6) can further increase the STPV efficiency by reducing the radiation loss. Compared with an original meta-surface serving as both absorber and emitter, the designed selective absorber and emitter can achieve a STPV efficiency of 9.5%, which ~ 20% higher than that of the original meta-surface (7.9%) while it is still lower than that of ideal absorber/emitter. These results indicate that the selective spectrum of the absorber and emitter is of significant to improve the STPV performance, giving valuable insights into design opportunity for the selective absorber and emitter in the STPV system.
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