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Electrical conductivity improved Cu2SnS3 thermoelectrics


Cu2SnS3 is an attractive earth abundant material for not only solar cells but also thermoelectrics because high thermoelectric performance is predicted by the first principle calculation. In our previous work, Cu2SnS3 is successfully synthesized by solid phase reaction with binary compounds and obtained a high Seebeck coefficient and a low thermal conductivity. However, a low electric conductivity results in a low figure of merit (ZT) of less than 0.1. In this work, CuS and In2S3 are added to starting materials to enhance the electrical conductivity and it has been improved by one order of magnitude.CuS and In2S3 addition enhance electrical conductivities.