Molar concentration effect on MgO thin films properties

Heat transfer enhancement in light‐emitting diode packaging employing different molar concentration of magnesium oxide thin films as a heat spreader

“…Composite thermal conductivity from magnesium oxide film that coated the Al (thickness = 1.50 nm) substrate would be playing a role in lowering both thermal resistance as well as junction temperature for LED attached to the magnesium oxide spreader and improves the efficiency of the lighting devices. Thin films of magnesium oxide were synthesized by either chemical evaporation technique, chemical bath, chemical vapor deposition (CVD), spin coating, solution spraying, electrochemical deposition, or Rf/DC sputtering method . Thin‐film deposition using spin coater machine was chosen for syntheses of MgO thin film in this study after considering its advantages of affordability by all, more comfortable to operate and handling, stoichiometry control, film thickness control, and uniformity in coated substrate areas …”

“…The 20 layers (0.6M) uniform particle distribution were due to an increase in the nucleation of the films, improvement in crystalline quality, and a decrease in total grain boundary fraction of the MgO films. Evidence in respect to closeness and neatness in the arrangement of ions in 0.6M was reported by Habiba et al that synthesis of thin films at lower precursor concentration is accompanied with an increase in nucleation thereby leading to the formation of uniformly distributed particles. As the concentration of the solution increases to 0.8M, the particles of the films began to agglomerate due to insufficiency of surfactant to break the bonding between the reacting molecules.…”

“…The surface smooth level values were increasing from 79 to 121 nm for 0.6M, similarly from 61 to 130.2 nm for 0.8M, and all values were proportional to thin‐film layers from both precursors. Surface roughness for images in Figures and was examined and extracted; results are displayed in Table ; higher surface roughness values 121 and 130.2 nm were recorded for 0.6M and 0.8M respectively due to the highest peak diffraction and particle cluster from films of a higher thickness (20 layers) . For efficient performance of thin‐film heat spreaders, MgO of lower surface roughness was proven to have high conductance, although results presented in this study showed 20 layers MgO of 0.6M giving good thermal transient results despite its high surface roughness; its performance was related to optimum film thickness, nonporous, and evenly distributed particles addition to MgO thermal conductivity of above 40 W/mK.…”

“…Thermally conductive ceramics from BN, BeO, AlN, SiC, MgO, Al 2 O 3 , and ZnO thin films are presently utilized as TIMs for LEDs packaging . However, magnesium oxide (MgO) possesses some features that make it suitable and dependable TIMs; these include exceptional insulation properties, stable at high temperature, thermal conductivity of above 40 W/mK, chemical inertness, (7.8 eV) bandgap, readily available, and does not require much energy during application …”

“…Thin films of magnesium oxide were synthesized by either chemical evaporation technique, chemical bath, chemical vapor deposition (CVD), spin coating, solution spraying, electrochemical deposition, or Rf/DC sputtering method . Thin‐film deposition using spin coater machine was chosen for syntheses of MgO thin film in this study after considering its advantages of affordability by all, more comfortable to operate and handling, stoichiometry control, film thickness control, and uniformity in coated substrate areas …”