A5078873315- Thermal Radiation and Cooling Technologies
- Solar Thermal and Photovoltaic Systems
- Nanowire Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- solar cell performance optimization
- Thin-Film Transistor Technologies
- 2D Materials and Applications
- Advanced Chemical Sensor Technologies
- Solar-Powered Water Purification Methods
- Analytical Chemistry and Sensors
- Photonic Crystals and Applications
- Advanced Sensor and Energy Harvesting Materials
- Photonic and Optical Devices
- Perovskite Materials and Applications
- ZnO doping and properties
- Graphene research and applications
- Plasmonic and Surface Plasmon Research
- Silicon Nanostructures and Photoluminescence
Dartmouth College
2012-2023
Tsinghua University
2012
Selective solar thermal absorber coating is an important component of concentrated power systems. It maximizes the absorption spectrum and minimizes radiation losses in mid-infrared regime. In this letter, we demonstrate a solution-processed plasmonic Ni nanochain-Al2O3 selective with high absorptance >90% low emittance loss <10%. Unlike conventional graded-index cermet coatings, spectral selectivity tailored by lengths nanochains, elimating requirement costly vacuum deposition...
We present a systematic approach for the design and optimization of nanoparticle-pigmented solar selective absorbers operation at 750 °C. Using scattering absorption cross-sections calculated by Lorenz-Mie theory as input, we employ four-flux radiative transfer method to investigate selectivity mechanism optimize optical-to-thermal conversion efficiency (ηtherm) function metallic nanoparticle material, diameter, volume fraction, coating thickness. Among material candidates in this study,...
Metal oxidation at high temperatures has long been a challenge in cermet solar thermal absorbers, which impedes the development of atmospherically stable, high-temperature, high-performance concentrated power (CSP) systems. In this work, we demonstrate solution-processed Ni nanochain-SiOx (x < 2) and nanochain-SiO2 selective absorbers that exhibit strong anti-oxidation behavior up to 600 °C air. The stability is far superior previously reported nanoparticle-Al2O3 readily oxidize 450...
2D MoS2 attracts increasing attention for its application in flexible electronics and photonic devices. For material optoelectronic devices, the light absorption of molecularly thin absorber would be one key limiting factors device efficiency, conventional photon management techniques are not necessarily compatible with them. In this study, we show two semimetal composite nanostructures deposited on synergistic strain-induced band gap engineering: (1) pseudo-periodic Sn nanodots, (2)...
Visualizing and manipulating the optical contrast of single-layer graphene (SLG) other 2D materials has continuously been an interesting topic to understand fundamental light-matter interaction down atomic thickness. Because properties SLG can be tuned by gating, demonstrating color also significant potential applications in ultrathin flexible display. However, previous demonstrations are mostly limited reflection intensity under monochromatic illumination using interference effect. The...
In order to address the metal oxidation issue in cermet solar thermal absorbers at high working temperatures, we developed solution-processed plasmonic Ni nanochain-SiO<sub>x</sub> (x≤2) selective that exhibit absorption, low emittance, and strong anti-oxidation behavior up 600 °C air. The stability is far superior more conventional nanoparticle-Al<sub>2</sub>O<sub>3</sub> absorbers, which readily oxidize 450 °C. nanochains were embedded SiO<sub>x</sub> SiO<sub>2</sub> matrices...
Cermet solar thermal selective absorber coatings are an important component of high-efficiency concentrated power (CSP) receivers. The oxidation the metal nanoparticles in cermet absorbers is a great challenge for vacuum-free operation. Recently, we have demonstrated that kinetically retarded solution processed, high-optical-performance Ni nanochain-SiOx system compared to conventional Ni-Al2O3 when annealed air at 450–600 °C several hours. However, long-term, high-temperature applications...
Self-assembled, nano-needle structured conductive SnOx introduces high-efficiency, low-loss light trapping to double the photocurrent of Ge/Si photodetectors. It can also be applied improve graphene absorption by 6x in a broad spectral range.
2D MoS2 attracts increasing attention for its application in flexible electronics and photonic devices. For material optoelectronic devices, light absorption of the molecularly thin absorber would be one key limiting factors device efficiency, conventional photon management techniques are not necessarily compatible with them. In this paper, we show two semimetal composite nanostructures synergistic strain-induced band gap engineering MoS2: (1) pseudo-periodic Sn nanodots, (2) conductive SnOx...