Browsing by Author "Jian, Ding-Rung"

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Down Shifted Converssion for Enhanceed HIT SSolar Cell Efficiency
(2017-01-01)
Lin, Albert S.
;
Parashar, Parag
;
Huang, Wei-Ming
;
Huang, Yi-Wen
;
Jian, Ding-Rung
In this work, HIT solar cell is incorporated with the luminescent down-shifting (LDS) mechanism for the incident solar spectrum. The heterojunction with intrinsic thin-layer(HIT) solar cell is highly efficient, low temperature (200 C), low cost, and highly symmetrical device. Nevertheless, the carrier collection efficiency is low for the short wavelength solar photons due to the surface recombination. Here, a thin phosphor layer is spray coated on the top of HIT solar cells for the luminescent down-shifting of high energy photons and thus enhanced external quantum efficiency (EQE) for the device for lambda=300nm-450nm is observed.
The Planar Thermophotovoltaic Selective Nearly-Perfect Absorbers/Emitters
(2017-01-01)
Parashar, Parag
;
Jian, Ding-Rung
;
Huang, Weiming
;
Huang, Yi-Wen
;
Lin, Albert
The spectral response of thermophotovoltaic (TPV) absorber is a key factor for TPV system efficiency. We have shown that the planar TPV emitters can be realized by using thin-metal-dielectric stacking (IEEE Photonics J. 8, 1300109, 2016). In this paper, we provide a new structure composed of alternating dielectric and deep-sub-skin-depth (DSSD) metal layers for TPV selective absorbers. The RCWA calculation and the Fourier transform infrared (FTIR) measurement of tantalum (Ta) based planar absorber shows a high absorbance below the cut-off wavelength (lambdalambda c).