Seebeck coefficient in amorphous chalcogenide films

Synthesis and characterization of semimagnetic semiconductor Pb1−xSmxSe

“…Temperature dependences of S for all samples indicate that metal-insulator transitions (MIT) takes place because the slope changes from negative (metallic similarly as expected for degenerate semiconductors [33]) to positive (semiconducting). As it is seen in Fig.…”

Field-effect measurements in disordered As30Te48Si12Ge10and As2Te3

“…These features constitute convincing evidence that the electrical transport processes in the two materials feature essentially unipolar conduction by hole carriers. Such a conclusion is supported by other data on the materials such as the thermopower (Rockstad, Flasck andIwasa 1972, Nagels, Callaerts andDenayer 1974), and by the fact that holes have been identified as the dominant carrier in all disordered chalcogenides for which time-offlight mobility measurements have been performed. It should be noted that the dominance of hole carriers in the transport processes does not imply that the trapped electron density is negligible, but only that the free electrons make little contribution to the conduction mechanisms.…”

Polaron activation energy of nano porphyrin nickel(II) thin films

“…In some materials, DE r was found to be equal to DE s , which has been interpreted in terms of holes conduction in the extended states. In other materials, DE r was found to be larger than DE s [47][48][49][50]. This result may be accounted for either with an intrinsic two carriers model [51] or with conduction by hopping in the valence band with an activation energy for the mobility equal to DE r -DE s [24,[48][49][50][51][52].…”