Direct evaluation of hole effective mass of SnS-SnSe solid solutions with ARPES measurement

Valence band dispersions of single-crystalline SnS 1− x Se x solid solutions were observed by angle-resolved photoemission spectroscopy (ARPES). The hole effective masses, crucial factors in determining thermoelectric properties, were directly evaluated. They decrease slightly with increasing Se content in the low Se composition range but sharply in the high Se composition range. The hole effective masses of SnS-SnSe solid solutions, crucial factors for their thermoelectric properties, are directly evaluated by ARPES measurement. They decrease slightly with increasing Se in the low Se range but sharply in the high Se range.