Two-dimensional hexagonal boron nitride as lateral heat spreader in electrically insulating packaging
Artikel i vetenskaplig tidskrift, 2016

The need for electrically insulating materials with a high in-plane thermal conductivity for lateral heat spreading applications in electronic devices has intensified studies of layered hexagonal boron nitride (h-BN) films. Due to its physicochemical properties, h-BN can be utilised in power dissipating devices such as an electrically insulating heat spreader material for laterally redistributing the heat from hotspots caused by locally excessive heat flux densities. In this study, two types of boron nitride based heat spreader test structures have been assembled and evaluated for heat dissipation. The test structures separately utilised a few-layer h-BN film with and without graphene enhancement drop coated onto the hotspot test structure. The influence of the h-BN heat spreader films on the temperature distribution across the surface of the hotspot test structure was studied at a range of heat flux densities through the hotspot. It was found that the graphene-enhanced h-BN film reduced the hotspot temperature by about 8–10°C at a 1000 W/cm2 heat flux density, a temperature decrease significantly larger than for h-BN film without graphene enhancement. Finite element simulations of the h-BN film predict that further improvements in heat spreading ability are possible if the thermal contact resistance between the film and test chip are minimised.

boron nitride

electrical insulation

lateral heat spreader

thermal conduction


Jie Bao

Michael Edwards

Elektronikmaterial och system

Shirong Huang

Yong Zhang

Elektronikmaterial och system

Yifeng Fu

Elektronikmaterial och system

et al

Kjell Jeppson

Elektronikmaterial och system

Johan Liu

Elektronikmaterial och system

Journal of Physics D: Applied Physics

0022-3727 (ISSN)

Vol. 49 265501-

Innovative Nano and Micro Technologies for Advanced Thermo and Mechanical Interfaces (NANOTHERM)

Europeiska kommissionen (FP7), 2012-09-01 -- 2015-08-31.