Titanium nitride selective absorber enhanced solar thermoelectric generator (SA-STEG)
2018; Elsevier BV; Volume: 141; Linguagem: Inglês
10.1016/j.applthermaleng.2018.06.032
ISSN1873-5606
AutoresDongyue Jiang, Zeng Fan, Ming Dong, Yan Shang, Xiaohua Liu, Guijun Chen, Sufen Li,
Tópico(s)Thermal Expansion and Ionic Conductivity
ResumoSolar thermoelectric generator (STEG) system has been intensively studied due to its reliability and environment-friendly property. In a STEG system, a solar absorber is an important component because it not only absorbs the solar energy, but also emits photons to environment as radiation heat loss. In this study, a selective absorber enhanced STEG system (SA-STEG) is presented. A Titanium nitride (TiN) based 2D photonic crystal (PhC) selective absorber is fabricated, which possesses a high absorptivity at short wavelength range to fully absorb the solar energy, but a suppressed absorptivity at long wavelength range to avoid the radiation loss. The selective absorber also keeps a good wavelength selectivity even after a thermal annealing over 1000 K. The selective absorptivity data were imported into the SA-STEG model and an improvement was obtained: for a Lead telluride STEG system, a 28 K temperature increase was achieved, and for a Silicon germanium alloy STEG system a 32 K temperature increase was achieved. The increased temperature yields a larger open-circuit voltage output. These results were attained based on a 40 × 40 mm2 STEG system and this value is expected to be further increased if a larger thermoelectric generator is employed.
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