title: Modifying the thermal conductivity of small molecule organic semiconductor thin films with metal nanoparticles.
abstract: Thermal properties of organic semiconductors play a significant role in the performance and lifetime of organic electronic devices, especially for scaled-up large area applications. Here we employ silver nanoparticles (Ag NPs) to modify the thermal conductivity of the small molecule organic semiconductor, dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT). The differential 3-ω method was used to measure the thermal conductivity of Ag-DNTT hybrid thin films. We find that the thermal conductivity of pure DNTT thin films do not vary with the deposition temperature over a range spanning 24 °C to 80 °C. The thermal conductivity of the Ag-DNTT hybrid thin film initially decreases and then increases when the Ag volume fraction increases from 0% to 32%. By applying the effective medium approximation to fit the experimental results of thermal conductivity, the extracted thermal boundary resistance of the Ag-DNTT interface is 1.14 ± 0.98 × 10(-7) m(2)-K/W. Finite element simulations of thermal conductivity for realistic film morphologies show good agreement with experimental results and effective medium approximations.
authors.affiliation: Department of Mechanical Engineering, The University of Hong Kong, Hong Kong.
authors.forename: Xinyu
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA.
authors.forename: Kevin D
authors.initials: KD
authors.lastname: Parrish
authors.affiliation: Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA.
authors.forename: Jonathan A
authors.initials: JA
authors.lastname: Malen
authors.affiliation: Department of Mechanical Engineering, The University of Hong Kong, Hong Kong.
authors.forename: Paddy K L
authors.initials: PK
authors.lastname: Chan