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Thermophotovoltaics with spectral and angular selective doped-oxide thermal emitters

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/oe.25.00a880· OSTI ID:1503240
 [1];  [2]
  1. Stanford Univ., CA (United States); Purdue University
  2. Stanford Univ., CA (United States)
Deliberate control of thermal emission properties using nanophotonics has improved a number of applications including thermophotovoltaics (TPV), radiative cooling and infrared spectroscopy. In this work, we study the effect of simultaneous control of angular and spectral properties of thermal emitters on the efficiencies of TPV systems. While spectral selectivity reduces sub-bandgap losses, angular selectivity is expected to enhance view factors at larger separation distances and hence to provide flexibilities in cooling the photovoltaic converter. We propose a design of an angular and spectral selective thermal emitter based on waveguide perfect absorption phenomena in epsilon-near-zero thin-films. Aluminum-doped Zinc-Oxide is used as an epsilon-near-zero material with a cross-over frequency in the near-infrared. A high contrast grating is designed to restrict the emission in a range of angles around the normal direction, while an integrated filter ensures spectral selectivity to reduce sub-bandgap losses. Theoretical analysis shows an expected relative enhancement of the TPV system efficiency of at least 32% using selective emitters with ideal angular and spectral selectivity at large separation distances compared to a blackbody. This enhancement factor, however, reduces to 3.9% with non-ideal selective emitters. This big reduction of the efficiency is attributed to sub-bandgap losses, off-angular losses and high-temperature dependence of optical constants.
Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0004946
OSTI ID:
1503240
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 20 Vol. 25; ISSN 1094-4087; ISSN OPEXFF
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Colored, Daytime Radiative Coolers with Thin-Film Resonators for Aesthetic Purposes journal August 2018
Hybrid Solar Absorber–Emitter by Coherence‐Enhanced Absorption for Improved Solar Thermophotovoltaic Conversion journal October 2018
A Multilayer Film Based Selective Thermal Emitter for Infrared Stealth Technology journal October 2018
Manipulating thermal emission with spatially static fluctuating fields in arbitrarily shaped epsilon-near-zero bodies journal March 2018
Practical emitters for thermophotovoltaics: a review journal February 2019
Absorptive angular-selective filters consisting of dielectric multilayers combined with thin absorbing layers journal January 2019

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