Thermal Conductivity of CuSbSe₂and CuBiSe₂in the Solid and Liquid State

Copper—antimony and copper—bismuth chalcogenides—Research opportunities and review for solar photovoltaics

“…Perhaps it can assume both conductivities, in any case it should be re-investigated. CuBiSe 2 is a similar case, one author's work on thin film 130 indicating n-type, and another's on bulk, 96,97 p-type. The p-type conductivity of the copper chalcogenides is generally rationalized in terms of the provision of an excess of the volatile components (e.g., Sb and a chalcogen) that would encourage the formation of copper vacancy acceptors.…”

“…Synthesis from the elements in sealed tubes is the most widely reported method and has been demonstrated for Cu 3 SbS 3 , 83 'tetrahedrite' Cu 12 Sb 4 S 13 and its mixed Sb-Bi analogue, 85 CuSbSe 2 , 86,87 Cu 3 SbSe 3 , 87,89,90 and CuBiSe 2 . 96,97 Spark sintering of the elements has been used for Cu 3 SbSe 3 84 and Cu 3 SbSe 3 91 ; and. 91,92 The elements may also be combined by ball milling at room temperature to produce powder.…”

Electrical Conductivity, Thermoelectric Power, and Thermal Conductivity of Bi29Tl35Se36Chalcogenide Glass Semiconductors in Solid and Liquid States

“…Measurements of thermal conductivity were carried out using the concentric cylinder method [7,8,9] where 0.5 gm of the material in the liquid state was poured into the cylindrical gap between two concentric graphite cylinders kept in nitrogen atmosphere. The systems was fitted with a heater and sensitive thermocouples for accurate measurements of temperature within kO.2"C and thermal conductivity was calculated using the formula:-where dl and d2 are the diameters of the inner and outer cylinders, TI and T2 are the temperatures on both sides of the sample, L is the length of the cylinders and Q is the quantity of heat generated.…”

“…Values of room temperature electronic and bipolar thermal conductivity A,(30) and Ah,,(30) for the investigated sample were calculated according to the following equation ( 10) [20] and equation (8), using values of cr(30), given in table I: where E , is the activation energy in the solid state (Ealsolid = O.lleV),K is the Boltzmann constant and T is the absolute temperature.…”