Greater Than 20% Radiant Heat Conversion Efficiency of a Thermophotovoltaic Radiator/Module System Using Reflective Spectral Control

Wernsman, B.; Siergiej, R.R.; Link, S.D.; Mahorter, Robert G.; Palmisiano, M. N.; Wehrer, R.J.; Schultz, Rebecca; Schmuck, G.P.; Messham, R.L.; Murray, Susan L.; Murray, Christopher S.; Newman, F.H.; Taylor, David; DePoy, D.M.; Rahmlow, Thomas D.

doi:10.1109/ted.2003.823247

Cited by 154 publications

(127 citation statements)

References 20 publications

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“…TPV cells with a 0.6 eV band gap and a tandem filter achieved efficiencies in excess of 20% with in-cavity efficiency tests [4]. Figures 7a and 7b present an overlay of expected and measured reflection for 0.6 eV and 0.52 eV filters at 45 AOI.…”

Section: Filter Fabrication Resultsmentioning

confidence: 95%

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New Performance Levels for TPV Front Surface Filters

Rahmlow¹

2004

AIP Conference Proceedings

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Abstract. Front surface spectral control filters significantly improve the efficiency of thermophotovoltaic (TPV) converters. Tandem filter designs for 0.52 and 0.60 eV cells were fabricated. Energy and angle weighted spectral efficiencies of ~83% for the 0.52 eV application and ~76% for the 0.60 eV applications were achieved with ~78% angle weighted above bandgap transmission. Manufacturing demonstrations of both designs were completed with good yield. Design improvements were made using angle weighted spectral utilization and above bandgap transmission as refinement goals. Current development work addresses elimination of the plasma filter and alternate substrates.

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Section: Filter Fabrication Resultsmentioning

confidence: 95%

“…For the 0.6 eV filters, a spectral efficiency 76% has been achieved with an angle weighted above bandgap transmission of 78%. Front surface filters with 0.6 eV TPV cells have achieved a measured, in-cavity efficiency of greater than 20% [4].…”

Section: Discussionmentioning

confidence: 99%

New Performance Levels for TPV Front Surface Filters

Rahmlow¹

2004

AIP Conference Proceedings

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“…A high conversion efficiency was demonstrated by Wernsman et al, who used a silicon nitride (Si 3 N 4 )/gold (Au) reflector on the backside of an InGaAs/InP (0.60 eV) diode with a dielectric stack on a highly n-doped InPaS plasma filter to achieve 23.6% conversion at 1039 °C (23). This suggests an R-value slightly above 0.1.…”

Section: Spectral Tuningmentioning

confidence: 99%

Thermophotovoltaic Energy Conversion for Personal Power Sources

Waits¹

2012

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“…26 These filters essentially reflect the low-energy photons back to the selective emitter, in a process known as photon recycling. [27][28][29][30][31][32] In order to achieve sufficient photon recycling, proximity between the emitter and filter is required. 33 In the typical cold-side filter configurations, where the filter is attached to the PV diode as an entire receiver, this requirement can be quantified by the view factor from the emitter to the receiver, which is the probability that emitted photons reach the receiver.…”

Section: Introductionmentioning

confidence: 99%

Integrated photonic crystal selective emitter for thermophotovoltaics

2016

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Abstract. Converting blackbody thermal radiation to electricity via thermophotovoltaics (TPV) is inherently inefficient. Photon recycling using cold-side filters offers potentially improved performance but requires extremely close spacing between the thermal emitter and the receiver, namely a high view factor. Here, we propose an alternative approach for thermal energy conversion, the use of an integrated photonic crystal selective emitter (IPSE), which combines twodimensional photonic crystal selective emitters and filters into a single device. Finite difference time domain and current transport simulations show that IPSEs can significantly suppress sub-bandgap photons. This increases heat-to-electricity conversion for photonic crystal based emitters from 35.2 up to 41.8% at 1573 K for a GaSb photovoltaic (PV) diode with matched bandgaps of 0.7 eV. The physical basis of this enhancement is a shift from a perturbative to a nonperturbative regime, which maximized photon recycling. Furthermore, combining IPSEs with nonconductive optical waveguides eliminates a key difficulty associated with TPV: the need for precise alignment between the hot selective emitter and cool PV diode. The physical effects of both the IPSE and waveguide can be quantified in terms of an extension of the concept of an effective view factor.

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Greater Than 20% Radiant Heat Conversion Efficiency of a Thermophotovoltaic Radiator/Module System Using Reflective Spectral Control

Cited by 154 publications

References 20 publications

New Performance Levels for TPV Front Surface Filters

New Performance Levels for TPV Front Surface Filters

Thermophotovoltaic Energy Conversion for Personal Power Sources

Integrated photonic crystal selective emitter for thermophotovoltaics

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