Emissivity of Electronic Materials, Coatings, and Structures

Muley, Sarang V.; Ravindra, Nuggehalli M.

doi:10.1007/s11837-014-0940-0

Cited by 19 publications

(12 citation statements)

References 35 publications

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“…The radiative heat load on the thermal link is approximately . A 1-mm gap is assumed between the thermal link and the TiNOX-coated clamshell surfaces as well as ε l =0.9 (from CaF 2 24 ), ε c = 0.05 (TiNOX solar absorber datasheet), T l = 135 K, and T c = 300 K. Figure 4b plots P rad vs. P fluor for thermal links with different δ . The δ = 15° design achieves the lowest P L , whereas links with a smaller δ have a significantly larger P fluor due to the greater η L , and links with greater δ have a slightly larger P rad due to their larger surface areas A l and A c .…”

Section: Resultsmentioning

confidence: 99%

First demonstration of an all-solid-state optical cryocooler

et al. 2018

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Solid-state optical refrigeration uses anti-Stokes fluorescence to cool macroscopic objects to cryogenic temperatures without vibrations. Crystals such as Yb3+-doped YLiF4 (YLF:Yb) have previously been laser-cooled to 91 K. In this study, we show for the first time laser cooling of a payload connected to a cooling crystal. A YLF:Yb crystal was placed inside a Herriott cell and pumped with a 1020-nm laser (47 W) to cool a HgCdTe sensor that is part of a working Fourier Transform Infrared (FTIR) spectrometer to 135 K. This first demonstration of an all-solid-state optical cryocooler was enabled by careful control of the various desired and undesired heat flows. Fluorescence heating of the payload was minimized by using a single-kink YLF thermal link between the YLF:Yb cooling crystal and the copper coldfinger that held the HgCdTe sensor. The adhesive-free bond between YLF and YLF:Yb showed excellent thermal reliability. This laser-cooled assembly was then supported by silica aerogel cylinders inside a vacuum clamshell to minimize undesired conductive and radiative heat loads from the warm surroundings. Our structure can serve as a baseline for future optical cryocooler devices.

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Section: Resultsmentioning

confidence: 99%

First demonstration of an all-solid-state optical cryocooler

et al. 2018

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“…This result is an approach to that in thermal radiation absorption. In general, the spectral absorption of SiO 2 is reported at an average of 0.2 for the IR wavelength from 5 μm to 14 μm [ 35 ].…”

Section: Characteristics Measurement and Analysismentioning

confidence: 99%

Research on a CMOS-MEMS Infrared Sensor with Reduced Graphene Oxide

Chen

2020

Sensors

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In this research, a new application of reduced graphene oxide (rGO) for a complementary metal-oxide-semiconductor (CMOS)-MEMS infrared (IR) sensor and emitter is proposed. Thorough investigations of IR properties including absorption and emission were proceeded with careful calibration and measurement with a CMOS thermoelectric sensor. The thermocouples of the sensor consist of aluminum and n-polysilicon layers which are fabricated with the TSMC 0.35 μm CMOS process and MEMS post-process. In order to improve the adhesion of rGO, a sensing area at the center of the membrane is formed with an array of holes, which is easy for the drop-coating of rGO material upon the sensing region. To evaluate the performance of the IR sensor with rGO, different conditions of the IR thermal radiation experiments were arranged. The results show that the responsivity of our proposed CMOS-MEMS IR sensor with rGO increases by about 77% compared with the sensor without rGO. For different IR absorption incident angles, the measurement of field of view shows that the CMOS-MEMS IR sensor with rGO has a smaller view angle, which can be applied for the application of long-distance measuring. In addition, characteristics of the proposed thermopile are estimated and analyzed with comparisons to the available commercial sensors by the experiments.

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“…The optical characteristics of the CaF 2 -CG were studied in the wavelength range of~350 to 1100 nm. By varying the thickness of the coating material, the optical properties of the thin film deposited on the substrate can be changed [28]. The prototype of the Macleod simulation parameters are shown in the Supporting Document.…”

Section: Optical Characterizationmentioning

confidence: 99%

Optical Properties of CaF2 Thin Film Deposited on Borosilicate Glass and Its Electrical Performance in PV Module Applications

et al. 2020

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Calcium fluoride (CaF2) is deposited via vacuum thermal evaporation on borosilicate glass to produce an anti-reflection coating for use in solar modules. Macleod’s essential simulation is used to optimize the thickness of the CaF2 coating on the glass. Experimentally, a 120 ± 4 nm-thin CaF2 film on glass shows an average increase of ~4% in transmittance and a decrease of ~3.2% in reflectance, respectively, when compared to that of uncoated glass (Un CG), within the wavelength spectrum of approximately 350 to 1100 nm. The electrical PV performance of CaF2-coated glass (CaF2-CG) was analyzed for conventional and lightweight photovoltaic module applications. An improvement in the short-circuit current (Jsc) from 38.13 to 39.07 mA/cm2 and an increase of 2.40% in the efficiency (η) was obtained when CaF2-CG glass was used instead of Un CG in a conventional module. Furthermore, Jsc enhancement from 35.63 to 36.44 mA/cm2 and η improvement of 2.32% was observed when a very thin CaF2-CG was placed between the polymethyl methacrylate (PMMA) and solar cell in a lightweight module.

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Emissivity of Electronic Materials, Coatings, and Structures

Cited by 19 publications

References 35 publications

First demonstration of an all-solid-state optical cryocooler

First demonstration of an all-solid-state optical cryocooler

Research on a CMOS-MEMS Infrared Sensor with Reduced Graphene Oxide

Optical Properties of CaF2 Thin Film Deposited on Borosilicate Glass and Its Electrical Performance in PV Module Applications

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