Nanostructures multilayer MgO/ZnO thin film thermal interface material for LED applications: Thermal, optical, and surface temperature performance

Idris, Muhammad Sani; Shanmugan, S.

doi:10.1007/s10854-021-06151-7

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…The steady-state temperature decreased by 4.1% in Case 3 (coating gap = 100 µm, tension = 55.9 N) and by 1.7% in Case 7 (coating gap = 300 µm, tension = 18.6 N) compared to Case 1 (coating gap = 100 µm, tension = 18.6 N). A decrease in the steady-state temperature indicates that the thermal conduction performance of the GNP/PMMA nanocomposite increases, thus allowing more heat flux to be released under the same heat flux flows [38,45]. Therefore, as the coating gap and tension in the lower-layer coating increased, the thermal conduction performance of the double-layered structure's GNP/PMMA nanocomposite improved.…”

Section: Resultsmentioning

confidence: 99%

“…TIMs are mainly located between the heat sink and source to prevent the thermal weathering of the integrated circuit and function as thermal conductors. Therefore, the thermal conductivity of the GNP/PMMA nanocomposite was selected as the functional quality, and a steady-state temperature analysis method was applied [24,38]. For the steady-state temperature analysis, a jig consisting of a thermography camera (LEPTON 3.5; Teledyne FLIR, Wilsonville, OR, USA), GNP/PMMA nanocomposite, aluminum heatsink, DC supply (2231A-30-3; Keithley, Solon, OH, USA), and 1 W LED was produced, as shown in Figure 4b-d [39].…”

Section: Methodsmentioning

confidence: 99%

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Layer-by-Layer Engineered Flexible Functional Film Fabrication with Spreadability Control in Roll-to-Roll Manufacturing

Jeon

Noh

et al. 2023

Polymers

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A roll-to-roll manufacturing system performs printing and coating on webs to mass-produce large-area functional films. The functional film of a multilayered structure is composed of layers with different components for performance improvement. The roll-to-roll system is capable of controlling the geometries of the coating and printing layers using process variables. However, research on geometric control using process variables is limited to single-layer structures only. This study entails the development of a method to proactively control the geometry of the upper coated layer by using the lower-layer coating process variable in the manufacture of a double-coated layer. The correlation between the lower-layer coating process variable and upper coated layer geometry was examined by analyzing the lower-layer surface roughness and spreadability of the upper-layer coating ink. The correlation analysis results demonstrate that tension was the dominant variable in the upper coated layer surface roughness. Additionally, this study found that adjusting the process variable of the lower-layer coating in a double-layered coating process could improve the surface roughness of the upper coating layer by up to 14.9%.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Layer-by-Layer Engineered Flexible Functional Film Fabrication with Spreadability Control in Roll-to-Roll Manufacturing

Jeon

Noh

et al. 2023

Polymers

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“…Though ZnO thin film has large mismatch of CTE with Al, ZnO interface shows better results on improving the heat conduction or reducing the T J than bare Al boundary conditions. It is because of the surface roughness of the thin film that improves the micro contact between the mating surface and high thermal conductivity of ZnO thin film than air at the interface level (Shanmugan et al , 2016; Idris and Shanmugan, 2021; JESD51, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…The same authors group has published few research papers on using ZnO thin film as TIM and reported improved performance of device under test at various boundary conditions where all thin films were deposited using sputtering methods (Mutharasu et al , 2013; Shanmugan and Mutharasu, 2015; Shanmugan et al , 2016). Spin coated ZnO thin film was also used to improve the LED performance along with MgO thin film by the same author group (Idris and Shanmugan, 2021). The ZnO thin film can be fabricated from various methods such as spin coating, sputtering, chemical bath deposition, atmospheric pressure chemical vapour deposition, spray pyrolysis and chemical vapour deposition (CVD) (Natsume and Sakata, 2000; Ellmer, 2000; Shinde et al , 2005; Nunes et al , 1999; Hu and Gordon, 1992; Minegishi et al , 1997).…”

Section: Introductionmentioning

confidence: 99%

CVD processed ZnO thin film as solid thermal interface material in electronic devices: thermal and optical performance of LED

Shanmugan

Devarajan²

2023

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Purpose Polymer-based thermal interface materials (TIMs) are having pump out problem and could be resolved for reliable application. Solid-based interface materials have been suggested and reported. The purpose of this paper is suggesting thin film-based TIM to sustain the light-emiting diode (LED) performance and electronic device miniaturization. Design/methodology/approach Consequently, ZnO thin film at various thicknesses was prepared by chemical vapour deposition (CVD) method and tested their thermal behaviour using thermal transient analysis as solid TIM for high-power LED. Findings Low value in total thermal resistance (Rth-tot) was observed for ZnO thin film boundary condition than bare Al boundary condition. The measured interface (ZnO thin film) resistance {(Rth-bhs) thermal resistance of the interface layer (thin film) placed between metal core printed circuit board (MCPCB) board and Al substrates} was nearly equal to Ag paste boundary condition and showed low values for ZnO film prepared at 30 min process time measured at 700 mA. The TJ value of LED mounted on ZnO thin film (prepared at 30 min.) coated Al substrates was measured to be 74.8°C. High value in junction temperature difference (ΔTJ) of about 4.7°C was noticed with 30 min processed ZnO thin film when compared with Al boundary condition. Low correlated colour temperature and high luminous flux values of tested LED were also observed with ZnO thin film boundary condition (processed at 30 min) compared with both Al substrate and Ag paste boundary condition. Originality/value Overall, 30 min CVD processed ZnO thin film would be an alternative for commercial TIM to achieve efficient thermal management. This will increase the life span of the LED as the proposed material decreases the TJ values.

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“…ZnO is one of the most efficient semiconductor oxide materials found as a zincite mineral in wurtzite form, and it possesses a hexagonal crystal arrangement [4,5]. The ZnO (bandgap 3.4 eV) has been extensively studied recently due to its industrial applications, such as in LEDs [6][7][8][9], biosensors [10][11][12][13], photodetectors [14,15], and solar cells [16,17]. Modern computational techniques [18,19] and experimental highpressure equipment [20] have enabled researchers to achieve a transition in the wurtzite ZnO structure towards new phases accompanying extraordinary properties under pressure.…”

Section: Introductionmentioning

confidence: 99%

DFT Investigation of the Structural, Electronic, and Optical Properties of AsTi (Bi)-Phase ZnO under Pressure for Optoelectronic Applications

Adnan,

Wang,

Sohu

et al. 2023

Materials

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Pressure-induced phases of ZnO have attracted considerable attention owing to their excellent electronic and optical properties. This study provides a vital insight into the electronic structure, optical characteristics, and structural properties of the AsTi (Bi) phase of ZnO under high pressure via the DFT-based first-principles approach. The phase transformation from BN(Bk) to the Bi phase of ZnO is estimated at 16.1 GPa using local density approximation, whereas the properties are explored precisely by the hybrid functional B3LYP. The electronic structure exploration confirms that the Bi phase is an insulator with a wider direct bandgap, which expands by increasing pressure. The dielectric function evidenced that the Bi phase behaves as a dielectric in the visible region and a metallic material at 18 eV. Optical features such as the refractive index and loss function revealed the transparent nature of the Bi phase in the UV range. Moreover, the considered Bi phase is found to possess a high absorption coefficient in the ultraviolet region. This research provides strong theoretical support for the development of Bi-phase ZnO-based optoelectronic and photovoltaic devices.

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Nanostructures multilayer MgO/ZnO thin film thermal interface material for LED applications: Thermal, optical, and surface temperature performance

Cited by 5 publications

References 22 publications

Layer-by-Layer Engineered Flexible Functional Film Fabrication with Spreadability Control in Roll-to-Roll Manufacturing

Layer-by-Layer Engineered Flexible Functional Film Fabrication with Spreadability Control in Roll-to-Roll Manufacturing

CVD processed ZnO thin film as solid thermal interface material in electronic devices: thermal and optical performance of LED

DFT Investigation of the Structural, Electronic, and Optical Properties of AsTi (Bi)-Phase ZnO under Pressure for Optoelectronic Applications

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