Thermal Boundary Resistance between N,N '-Bis(1-naphthyl)-N,N '-diphenylbenzidine and Aluminum Films

Abstract

To determine the thermal boundary resistance between N,N '-bis(1-naphthyl)-N,N '-diphenylbenzidine (α-NPD) and aluminum (Al) films, we prepared α-NPD films sandwiched between Al films (Al/α-NPD/Al); the nominal thicknesses of the α-NPD and Al films were 1–30 and 74 nm, respectively. Then, we used “rear heating/front detection type” picosecond and nanosecond thermoreflectance systems to directly observe the heat transfer through the film thickness. We found that the thermal boundary resistance between α-NPD and Al was 3.5 ×10-9 m2 K W-1, corresponding to the thermal resistance of a 0.9-nm-thick α-NPD film or a 720-nm-thick Al film.