Electronic Supplementary Information Doping of thermoelectric PbSe with chemically inert secondary phase nanoparticles Chao-Feng Wu, Heng Wang*, Qimin Yan, Tian-Ran Wei and Jing-Feng Li* I. Micro-hard tests and Indentation morphologies Figure S1. (a) Micro-hardness values as a function of SiC content, and indentation morphologies of (b) 0 vol% and 2 vol% samples. II. XRD results and Microscopy images Figure S2. (a) XRD results of PbSe-SiC composites and (b) enlarged area of (420) peaks. Electronic Supplementary Material (ESI) for Journal of Materials Chemistry C. This journal is © The Royal Society of Chemistry 2017