NOVELTY - Thermoelectric material comprises a chalcogenide compound (I).    USE - The thermoelectric material is useful in the thermoelectric module, thermoelectric device and the apparatus (all claimed). The thermoelectric material is useful: for refrigerant-free refrigerators, air conditioners, waste heat power generation, nuclear power generation for military and aerospace, and micro-cooling systems; and in a variety of fields that increase energy efficiency or reuse waste heat, such as in vehicle engines and air exhausters, waste incinerators, waste heat in iron mills, and power sources of medical devices in the human body using human body heat.    ADVANTAGE - The thermoelectric material has high dimensionless performance index due to a high Seebeck coefficient, high electrical conductivity, and low thermal conductivity. The thermoelectric material provides the device with improved stability.    DETAILED DESCRIPTION - Thermoelectric material comprises a chalcogenide compound of formula ((A11-aA2a)4-x(B11-bB2b)3-y-zC1z) (I).    A1 = a Group XIII element;    A2 = a Group XIII and/or XIV, a rare earth metal, and/or a transition metal, where A1 and A2 are different from each other;    B1 = at least one chalcogen elements;    B2 = Groups XIV, XV and/or XVI, where B1 and B2 are different from each other;    C1 = at least one halo elements;    a, b = greater than or equal to 0 to less than 1;    x, y = -1 to 1; and    z = 0-0.5.    INDEPENDENT CLAIMS are included for:    (1) a thermoelectric module comprising a first electrode, a second electrode and a thermoelectric element disposed between the first electrode and the second electrode, where the thermoelectric element comprises the thermoelectric material;    (2) a thermoelectric device comprising a heat source, and a thermoelectric module comprising a thermoelectric element that absorbs heat from the heat source, a first electrode disposed to be in contact with the thermoelectric element, and a second electrode disposed to face the first electrode and be in contact with the thermoelectric element, where the thermoelectric element comprises the thermoelectric material;    (3) an apparatus, comprising a heat source and a thermoelectric device including a first electrode, which absorbs heat from the heat source, a second electrode disposed substantially opposite the first electrode and the thermoelectric material; and    (4) the chalcogenide compound (I).