Electron scattering by acceptor centers in p-Ag2Te at low temperatures

Alloying to increase the band gap for improving thermoelectric properties of Ag2Te

“…It was known that carrier scattering in Ag 2 Te was dominated by acoustic phonons in both low temperature and high temperature phases. 38,45,46 The existence of acoustic scattering can be seen from the rapidly decreasing Hall mobility with increasing temperature (Fig. 3d).…”

“…38,45,46 The existence of acoustic scattering can be seen from the rapidly decreasing Hall mobility with increasing temperature (Fig. 3d).…”

“…Furthermore, the bands for narrow gap Ag 2 Te were also found to be nonparabolic and could be described by a Kane band model. 38,[45][46][47] Nonparabolic Kane band theory 14,48 and acoustic scattering theory 8,9 enables a detailed single Kane band model (SKB) 14,48,49 to predict the electrical transport properties of a thermoelectric semiconductor. Using the above mentioned E g and the measured electrical transport shown in Fig.…”

Role of intrinsic defects in splitting the energy spectra of charge carriers in Ag2Te

“…The degree of defectness quantitatively and qualitatively changes the character of the dependences σ(T) and R(T), which is confirmed by the implementation of an electron phase transition of the ordering type for Ag 2 Te [20]. The basic mechanism of charge carrier scattering is scat tering at defects at low temperatures and at thermal lattice vibrations at high temperatures [6,7,13].…”

“…On the dependences σ(T), R(T), and α 0 (T) in p Ag 2 Te, we observed also quantitative differences (similar to n Ag 2 Te) because the values of σ and R significantly differ quantitatively at different Te contents. The obtained data on σ(T), R(T), and α 0 (T) in n Ag 2 Te and p Ag 2 Te are discussed in [6][7][8]13] in detail. However, the causes of pronounced distinction in the values of are not analyzed in these studies.…”