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Graphene-assisted Si-InSb thermophotovoltaic system for low temperature applications.
Lim, Mikyung,Jin, Seokmin,Lee, Seung S,Lee, Bong Jae Optical Society of America 2015 Optics express Vol.23 No.7
<P>The present work theoretically analyzes the performance of the near-field thermophotovoltaic (TPV) energy conversion device for low temperature applications (Tsource 500 K). In the proposed TPV system, doped Si is employed as the source because its optical property can be readily tuned by changing the doping concentration, and InSb is selected as a TPV cell because of its low bandgap energy (0.17 eV). In order to enhance the near-field thermal radiation between the source and the TPV cell, monolayer of graphene is coated on the cell side so that surface plasmon can play a critical role in heat transfer. It is found that monolayer of graphene can significantly enhance the power throughput by 30 times and the conversion efficiency by 6.1 times compared to the case without graphene layer. The resulting maximum conversion efficiency is 19.4% at 10-nm vacuum gap width.</P>
Lim, Mikyung,Song, Jaeman,Kim, Jihoon,Lee, Seung S.,Lee, Ikjin,Lee, Bong Jae Elsevier 2018 Journal of quantitative spectroscopy & radiative t Vol.210 No.-
<P><B>Abstract</B></P> <P>The present work successfully achieves a strong enhancement in performance of a near-field thermophotovoltaic (TPV) system operating at low temperature and large-vacuum-gap width by introducing a hyperbolic-metamaterial (HMM) emitter, multilayered graphene, and an Au-backside reflector. Design variables for the HMM emitter and the multilayered-graphene-covered TPV cell are optimized for maximizing the power output of the near-field TPV system with the genetic algorithm. The near-field TPV system with the optimized configuration results in 24.2 times of enhancement in power output compared with that of the system with a bulk emitter and a bare TPV cell. Through the analysis of the radiative heat transfer together with surface-plasmon-polariton (SPP) dispersion curves, it is found that coupling of SPPs generated from both the HMM emitter and the multilayered-graphene-covered TPV cell plays a key role in a substantial increase in the heat transfer even at a 200-nm vacuum gap. Further, the backside reflector at the bottom of the TPV cell significantly increases not only the conversion efficiency, but also the power output by generating additional polariton modes which can be readily coupled with the existing SPPs of the HMM emitter and the multilayered-graphene-covered TPV cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The near-field thermophotovoltaic system with a hyperbolic-metamaterial emitter, multilayered graphene, and a backside reflector is proposed. </LI> <LI> The configuration of a hyperbolic-metamaterial emitter and multilayered-graphene-covered TPV is optimized for maximizing the power output with the genetic algorithm. </LI> <LI> The fundamental mechanism for the enhancement of power output is explored. </LI> <LI> The coupling of the surface polaritons supported in a hyperbolic-metamaterial emitter, multilayered graphene, and TPV cell with backside reflector is analyzed. </LI> <LI> Significant enhancement in power output of near-field TPV system operating at low temperature and large vacuum gap is achieved. </LI> </UL> </P>
Fabrication of the microchannel by metal-organic framework, copper benzenetricarboxylate.
Lim, Mikyung,Seo, You-Kyong,Park, Hyoun Hyang,Kim, Jin-Ha,Chang, Jong-San,Hwang, Young Kyu,Lee, Seung S American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.4
<P>We successfully fabricated the metal-organic framework (MOF), copper benzenetricarboxylate on a microchannel system, which was able to solve the problems created by increased heat dissipation in small electronic equipment. The microchannel system was designed to make an entrance part that can control the reaction temperature, which was predicted through a heat transfer analysis and the finite element method with COMSOL Multiphysics. Synthetic conditions, synthesis time, temperature and microchannel size were systematically tuned for the selective fabrication of copper benzenetricarboxylate on a microchannel surface. Scanning electron microscope (SEM) images, selected area electron diffraction (SAED) pattern and Fourier transform infrared (FT-IR) data clearly demonstrated that copper benzenetricarboxylate was strongly adhered to the bottom surfaces of the microchannels. Moreover, the synthesis of MOF in the microchannel system provided a much faster growth rate and better crystallinity compared to a conventional synthesis method.</P>