Novel Methods to Harness Solar Radiation for Advanced Energy Applications

Yin, Gao; Wang, Ziman; Ding, Ding; Li, Wenjia; Ma, Yaoguang; Hao, Yong; Zhang, Hang

doi:10.30919/esee8c328

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…Thus, thermal radiation is a ubiquitous phenomenon and now witnesses essential applications in several domains, such as infrared imaging, [1] remote-sensing detection [2] , and energy conversion and utilization. [3][4][5][6][7][8] In general, natural objects are isotropic, and the outwardemitted thermal radiation shows no pronounced directivity. On the other hand, with the development of science and technology, many application fields have set a higher requirement on the direction selectivity of the thermal radiation, and simultaneously, thermal structures with direction selectivity have now attracted a significant amount of attention.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of a Multilayer Structure for Broadband and Direction-Selective Emissivity

Wang¹,

Wu²,

Wang³

et al. 2021

ES Energy Environ.

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Micro-nano structures for broadband and direction-selective emission have long been a scientific and engineering challenge. In this work, based on the emissivity distribution of three silver-coated dielectric media, including silicon dioxide (SiO2), silicon monoxide (SiO), and aluminum oxide (Al2O3), a multilayer structure was designed for broadband and direction-selective emissivity. The structure's emissivity varying with wavelength and emission direction was analyzed. Effects of different arrangement modes of the dielectric media and the thickness of each dielectric layer on the multilayer structure's emissivity were examined for design optimization. The optimal multilayer structure exhibits a strong direction-selective emissivity within a broadband wavelength of 8.0-11.0 m which covers the spectral emission peak of an object maintained at ~300 K, and thus has potential applications in infrared camouflage.

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Section: Introductionmentioning

confidence: 99%

Optimization Design of a Multilayer Structure for Broadband and Direction-Selective Emissivity

Wang¹,

Wu²,

Wang³

et al. 2021

ES Energy Environ.

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“…Therefore, the design of an engineering system requires consideration of its heat dissipation, which refers to the release of heat generated during the operation of the system to the external environment. In addition, thermal management with engineering systems and materials is important in collecting solar energy and its conversion [1][2][3]. Similar to various systems that generate heat, heat dissipation is a critical issue affecting the performance of integrated light-emitting diode (LED) systems [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Thermal Radiative Copper Oxide Layer for Enhancing Heat Dissipation of Metal Surface

Park

Kim

et al. 2021

Nanomaterials

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The heat dissipation of a metal heat sink for passive cooling can be enhanced by surface modifications to increase its thermal emissivity, which is reflected by a darker surface appearance. In this study, copper electrodeposition followed by heat treatment was applied to a copper substrate. The heat treatment formed a nanoporous oxide layer containing CuO and Cu2O, which has a dark blackish color and therefore increased the thermal emissivity of the surface. The heat dissipation performance was evaluated using the sample as a heat sink for an LED module. The surface-treated copper heat sink with a high thermal emissivity oxide layer enhanced the heat dissipation of the LED module and allowed it to be operated at a lower temperature. With an increase in the heat treatment, the thermal emissivity increases to 0.865, but the thermal diffusivity is lower than the copper substrate by ~12%. These results indicate that the oxide layer is a thermal barrier for heat transfer, thus optimization between the oxide thickness and thermal emissivity is required by evaluating heat dissipation performance in operating conditions. In this study, an oxide layer with an emissivity of 0.857 and ~5% lower thermal diffusivity than the copper substrate showed the lowest LED operating temperature.

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“…[4,5,6] Photoelectric conversion and photothermal conversion are efficient ways to utilize the solar energy. [7,8,9,10] Advanced photothermal conversion devices can utilize the solar energy effectively, [11,12,13,14] but the photoelectric conversion efficiency still needs to be improved. Louise et.al [15] clarified the intrinsic loss mechanism that lead to fundamental limits in solar cell efficiency.…”

Section: Introductionmentioning

confidence: 99%

Full-Spectrum Solar Energy Utilization and Enhanced Solar Energy Harvesting via Photon Anti-Reflection and Scattering Performance Using Nanophotonic Structure

Liang¹,

Wang²,

Cheng³

et al. 2020

ES Energy Environ.

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Conventional Si photovoltaic cells cannot convert full solar energy spectrum (400~2 500 nm) into electricity owing to the mismatch between Si band gap and broad range of solar photon energies. Transparent silicon PV cell allows sunlight in the wavelength of 1 100~2 500 nm to transmit through itself and irradiate on the thermal absorber below. The traditional photon management method based on texturing silicon layer with nanostructures can enhance 400~1 100 nm absorptivity and 1 1002 500 nm transmittance of transparent silicon PV cell. However, an increase in charge carrier capture and a decrease in electricity generation efficiency are often observed with this. In this study, a novel spectral splitting method based on frontlocated wavelength-sized TiO 2 biomimetic moth-eye nanophotonic structure is put forward, which can inhibit the increase of charge carrier capture and recombination. The biomimetic moth-eye nanophotonic structure was optimized by using finitedifference time-domain (FDTD) method to achieve excellent photon anti-reflection and scattering properties. The calculation results indicated that the absorption factor and transmission factor of transparent silicon PV cell could be increased from 46% to 58% and from 11% to 14%; the relative power conversion efficiency enhancement rate and relative incident radiation power enhancement rate was 32% and 27% when the TiO 2 biomimetic moth-eye was adopted.

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Novel Methods to Harness Solar Radiation for Advanced Energy Applications

Cited by 13 publications

References 15 publications

Optimization Design of a Multilayer Structure for Broadband and Direction-Selective Emissivity

Optimization Design of a Multilayer Structure for Broadband and Direction-Selective Emissivity

Thermal Radiative Copper Oxide Layer for Enhancing Heat Dissipation of Metal Surface

Full-Spectrum Solar Energy Utilization and Enhanced Solar Energy Harvesting via Photon Anti-Reflection and Scattering Performance Using Nanophotonic Structure

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