Synthesis and Electronic Transport of n-Type Ag2Te1−x Se x (x = 0, 0.01, and 0.02) via Aqueous Solution Method at Room Temperature

Lin, Fei‐Hung; Pai, Yi-Hsuan; Chu, Yen-Ping; Liu, Chia‐Jyi

doi:10.1007/s11664-016-5112-2

Cited by 1 publication

(4 citation statements)

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“…A highest ZT of ∼0.68 at 573 K in the Ag 2 Te/Ag nanocomposite and the ZT of ∼0.067 and ∼0.32 at 300 K in uncapped and 1,2-ethanedithiol-capped Ag 2 Te nanocrystals, respectively, have also been reported . The maximum PFs of ∼1370 μW m –1 K –2 at 425 K in Ag 1.99 TeSe 0.01 /Ag nanocomposites, ∼315 μW m –1 K –2 at 410 K in Ag 2 Te nanowire films, and ∼3.94 μW m –1 K –2 at 300 K in Ag 2 Te/Ag nanofibers have been reported. Although these reports focus only on TE properties for the temperature over 300 K, low-temperature TE properties of this compound are not explored so far.…”

Section: Introductionmentioning

confidence: 87%

“…A highest ZT of ⁓ 0.68 at 573 K in Ag2Te/Ag nanocomposite 30 and ZT of ⁓ 0.067 and ⁓ 0.32 at 300 K in uncapped and 1,2-ethanedithiolcapped Ag2Te nanocrystals, respectively have also been reported 25 . The maximum PF of ~1370 µWm -1 K -2 at 425 K in Ag1.99TeSe0.01/Ag nanocomposites 24 , ~ 315 µWm -1 K -2 at 410 K in Ag2Te nanowire films 27 , and ~ 3.94 µWm -1 K -2 at 300 K in Ag2Te/Ag nanofibers 28 have been reported.…”

Section: Introductionmentioning

confidence: 97%

“…Although its low effective mass (~ 10 -2 of free electron mass) 16 favours the small S, high mobility makes both σ and 𝜅 𝑒 large. As a result, ZT of ⁓ 0.27 at 370 K 22 and ⁓ 0.29 at 550 K 23 for bulk Ag2Te along with several attempts to improve upon its TE properties via nanostructuring, alloying and or doping 20,23,24,25,26,27,28,29 have been reported so far. Cadavid et al 29 showed a peak ZT of ~ 0.66 at 450 K in surfacefunctionalized Ag2Te NPs.…”

Section: Introductionmentioning

confidence: 99%

“…While α-Ag 2 Te phase is a superionic conductor, its β-phase is a narrow-band gap (∼0.05 eV) semiconductor with high carrier mobility and low κ l due to the Ag-atoms-induced disordered structure in the Ag 2 Te lattice, making it a suitable TE material. ,, Although its low effective mass (∼10 –2 of free electron mass) favors the small S , high mobility makes both σ and κ e large. As a result, ZT of ∼0.27 at 370 K and ∼0.29 at 550 K for bulk Ag 2 Te along with several attempts to improve upon its TE properties via nanostructuring, alloying and/or doping ,− has been reported so far. Cadavid et al showed a peak ZT of ∼0.66 at 450 K in surface-functionalized Ag 2 Te NPs.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Thermoelectric Performance of Nanostructured Nickel-Doped Ag₂Te

Sharma

Verma

Bhatt

et al. 2022

ACS Appl. Energy Mater.

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We report on the thermoelectric (TE) properties of nickel-doped Ag 2−x Ni x Te (x = 0, 0.015, 0.025 & 0.055, 0.115, 0.155) nanostructures (NSs) in the temperature (T) range of 5−575 K. The electrical resistivity (ρ) of Ag 2 Te nanostructure shows metallic behavior in 5−300 K initially that evolves into two metal to insulator transitions at low-and mid-temperature regimes with increasing x due to Mott-variable range hopping (VRH) and Arrhenius transports, respectively. Their Seebeck coefficient varies nearly in a linear fashion in this temperature range, showing metallic or doped degenerate semiconducting behavior. Notably, this behavior of Seebeck coefficient (S ∝ T) is in contrast to Mott-VRH conduction (S ∝ T 1/2 ) as observed in ρ. The steady increase in ρ and S with the sharp decrease in thermal conductivity between 410 and 425 K associated with the structural phase transition accomplishes a maximum TE figure of merit (ZT) of 0.86 ± 0.1 near 480 K in x = 0.155. This is ∼83% more compared to that of bulk Ag 2 Te and shows a significant improvement over the best value reported for Ag 2 Te NSs thus far. This study, therefore, shows that simultaneous nanocomposite formation, doping, and nanostructuring could be an effective strategy for tuning the electron and phonon transports to improve the TE properties of a material.

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