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2015 ; 5
(ä): 11626
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Impacts of propagating, frustrated and surface modes on radiative, electrical and
thermal losses in nanoscale-gap thermophotovoltaic power generators
#MMPMID26112658
Bernardi MP
; Dupré O
; Blandre E
; Chapuis PO
; Vaillon R
; Francoeur M
Sci Rep
2015[Jun]; 5
(ä): 11626
PMID26112658
show ga
The impacts of radiative, electrical and thermal losses on the performances of
nanoscale-gap thermophotovoltaic (nano-TPV) power generators consisting of a
gallium antimonide cell paired with a broadband tungsten and a
radiatively-optimized Drude radiator are analyzed. Results reveal that surface
mode mediated nano-TPV power generation with the Drude radiator outperforms the
tungsten radiator, dominated by frustrated modes, only for a vacuum gap thickness
of 10?nm and if both electrical and thermal losses are neglected. The key
limiting factors for the Drude- and tungsten-based devices are respectively the
recombination of electron-hole pairs at the cell surface and thermalization of
radiation with energy larger than the cell absorption bandgap. A design guideline
is also proposed where a high energy cutoff above which radiation has a net
negative effect on nano-TPV power output due to thermal losses is determined. It
is shown that the power output of a tungsten-based device increases by 6.5% while
the cell temperature decreases by 30?K when applying a high energy cutoff at
1.45?eV. This work demonstrates that design and optimization of nano-TPV devices
must account for radiative, electrical and thermal losses.