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Title: Thermodynamics of Light Management in Near-Field Thermophotovoltaics

Journal Article · · Physical Review Applied
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]
  1. The Barcelona Inst. of Science and Technology, Castelldefels (Spain); Stanford Univ., CA (United States). Ginzton Lab.; OSTI
  2. Technion-Israel Institute of Technology, Haifa (Israel)
  3. Univ. of California, Berkeley, CA (United States)
  4. Stanford Univ., CA (United States). Ginzton Lab.

We evaluate near-field thermophotovoltaic (TPV) energy-conversion systems focusing in particular on their open-circuit voltage (VOC). Unlike previous analyses based largely on numerical simulations with fluctuational electrodynamics, here, we develop an analytic model that captures the physics of near-field TPV systems and can predict their performance metrics. Using our model, we identify two opportunities of TPV systems operating in the near field. First, we show analytically that enhancement of radiative recombination is a natural consequence of operating in the near field. Second, we note that, owing to photon recycling and minimal radiation leakage in near-field operation, the PV cell used in near-field TPV systems can be much thinner compared to those used in solar PV systems. Since nonradiative recombination is a volumetric effect, use of a thinner cell reduces nonradiative losses per unit area. The combination of these two opportunities leads to increasingly large values of VOC as the TPV vacuum gap decreases. Hence, although operation in the near-field was previously perceived to be beneficial for electrical power-density enhancement, here, we emphasize that thin-film near-field TPVs are also significantly advantageous in terms of VOC and consequently conversion efficiency as well as power density. We provide numerical results for an InAs-based thin-film TPV that exhibits efficiency >50% at an emitter temperature as low as 1100 K.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); US Army Research Office (ARO)
Grant/Contract Number:
SC0019140
OSTI ID:
1979641
Journal Information:
Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 16; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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