Details

Autor(en) / Beteiligte

• Kim, Dong Ho
• Kim, Hyun-Sik
• Hong, Seokown
• Lee, Ju Hyeong
• Han, Jae Gwan
• Cho, Hong Sik
• Lee, Se Woong
• Kim, Sang-il

Titel

Investigation of PdTe2 Phase Segregation on Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Fabricated by Melt-Spinning Technique for Possible Carrier Filtering Effect

Ist Teil von

• Electronic Materials Letters, 2021, 17(5), , pp.436-442

Ort / Verlag

Seoul: The Korean Institute of Metals and Materials

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Influence of secondary phases of PdTe 2 in n -type thermoelectric Cu 0.008 Bi 2 Te 2.7 Se 0.3 alloys on their thermoelectric properties was investigated through in situ phase separation by melt spinning process. The phase segregation of PdTe 2 in the Cu 0.008 Bi 2 Te 2.7 Se 0.3 matrix were successfully induced by using the melt spinning process. Since heterointerfaces of PdTe 2 and Cu 0.008 Bi 2 Te 2.7 Se 0.3 form potential barriers, low energy carrier filtering effect could be expected; however, the power factor and effective mass decreased with the PdTe 2 addition, which implies that the carrier filtering effect did not occur. The potential barrier of 0.06 eV expected at the interfaces between PdTe 2 and Cu 0.008 Bi 2 Te 2.7 Se 0.3 matrix seems not to induce carrier energy filtering effect. However, further investigation based on single parabolic band model shows that the non-degenerate mobility and quality factor B are enhanced by PdTe 2 addition, suggesting that the further optimization of the carrier concentration would increase zT further in PdTe 2 -added Cu 0.008 Bi 2 Te 2.7 Se 0.3 samples. This implies that the favorable carrier filtering effect could be attained by further controlling the optimal carrier concentration even with small barrier heights. Graphic Abstract