ChemInform Abstract: Electrophysical Properties of the Compounds Cu2A(II)B(IV)Se4 (A(II): Cd, Hg; B(IV): Ge, Sn).

Abstract

ChemInform Abstract The title compounds are prepared from the elements in evacuated quartz ampoules, which are heated to 1150-1350 K. The temp. dependences of the specific electric conductivities, of the Hall coefficients and of the thermoelectromotive forces are determined between 150 and 950 K. Furthermore the width of the forbidden zone, the microhardness, the pyknometric density and the lattice parameters are determined.

The reciprocal system Cu2GeS3+3CdSe⇔Cu2GeSe3+3CdS

“…Mkrtchyan et al [1] showed that the Cu 2 CdGeSe 4 crystals at room temperature have p-type conductivity, and the thermal bandgap energy is 1.20 eV.…”

“…for Cu 2 CdGeSe 4 [1]) make them promising materials for the heterojunctions for the conversion of solar and polarized radiation based on the wide-band, n-type B II X semiconductors.…”

“…An important part in the enrichment of such materials belongs to complex ternary and quaternary chalcogenides, e.g. CuInSe 2 , CuInS 2 , Cu 2 CdGeSe 4 , Cu 2 CdSnSe 4 , Cu 2 CdGeS 4 [1][2][3][4]. The search for new materials with promising properties is performed by the investigation of complex chalcogenide systems.…”

Specific features of band structure and optical anisotropy of Cu2CdGeSe4 quaternary compounds

“…Cu 2 CdGeSe 4 is a typical p-type semiconductor with optical energy gap value equal to 1.29 eV [ 10 ] or 1.20 eV [ 11 ] and strong optical anisotropy. Its microhardness is equal to 1.90 GPa [ 9 ] or 2.32 GPa [ 12 ], and its density is equal to 5.45 g/cm 3 [ 12 ].…”

Cu2HgSnSe4 nanoparticles: synthesis and thermoelectric properties

“…The three compounds are characterized by high absorption coefficients and direct band gaps that narrow with the atomic weight of the II element; from 1.0-1.4 eV for CZTSe to 0.89-0.96 eV for CCTSe and 0.17 eV for CHTSe. 4,[7][8][9] Crystallographically, the three compounds display diamondlike phases. [10][11][12] However, the distribution of the cations within the unit cell depends on the nature of the II element.…”