Thermal conduction in ultra-thin pure and doped single crystal silicon layers at high temperatures

This work presents the in-plane thermal conductivity data for pure as well as boron (1.6 x 10(21)/cm(3)), arsenic (2.3 x 10(20)/cm(3)) and phosphorus (2.3 x 10(20)/cm(3)) doped silicon layers of thickness 30 and 50 nm at high temperature. The steady-state Joule heating and electrical resistance thermometry is used to measure lateral thermal conductivity of suspended silicon layers. Thermal conductivity data for pure and lightly doped single crystalline silicon layers can be interpreted using thermal conductivity integral and relaxation time approximation for phonon-boundary and phonon-impurity scattering rates. No additional fitting parameters are used in this work; in contrast with previous studies that required an unusually large phonon-impurity scattering coefficient to match the predictions to the thermal conductivity data for bulk doped silicon.