Realize high thermoelectric properties in n-type Bi2Te2.7Se0.3 materials via ZrO2 ceramic nanoparticles mediated heterogeneous interface

Enhancing Thermoelectric Performance of n-Type Bi2Te2.7Se0.3 through Incorporation of Amorphous Si3N4 Nanoparticles

“…As the most famous TE materials, Bi 2 Te 3 -based alloys have been dominant in the commercial application position for utilization in portable TE refrigerators. − Over half a century, many strategies have been studied to enhance their TE performance. In p-type polycrystalline Bi 2 Te 3 , the strategy of grain refinement (ball milling, hydrothermal, and melt-spinning) has successfully obtained high ZT values of 1.2–1.6. , However, it is difficult to improve the TE performance of n-type Bi 2 Te 3 as compared to that of p-type . Commercial n-type Bi 2 Te 3 has the largest ZT of around 0.8.…”

Attaining High Figure of Merit in the N-Type Bi2Te2.7Se0.3-Ag2Te Composite System via Comprehensive Regulation of Its Thermoelectric Properties

“…N-type Bi 2 Te 3 -based compounds as the state-of-the-art thermoelectric materials near room temperature have attracted extensive attentions. − However, the fact that the inferior performance of n-type Bi 2 Te 3 -based materials than that of p-type counterpart seriously hinders its wide widespread commercial applications. − Currently, most of the work focused on relatively independent κ L , and various strategies to decrease κ L have been developed, such as optimizing preparation techniques, − refining grains, , and compositing nanophases. − A promising example is the addition of polyaniline (PANI) particles into Bi 2 Te 2.7 Se 0.3 (BTS) to effectively scatter phonons of all frequencies, thereby obtaining substantially reduced lattice thermal conductivity and a high ZT ≈1.22 at 345 K . On the other hand, previous work to increase PF by regulating one parameter or another often leads to attending to one thing and losing sight of another; for example, (1) to elevate S via the energy filtering effect (EFE) usually resulted in reduction of electron mobility μ; , (2) to enlarge carrier mobility μ through enhancement of texturing, accompanying which electron concentration increased, leading to elevation of electron thermal conductivity κ e ; , (3) to increase electrical conductivity by elevating carrier concentration n , which inevitably caused enlargement of κ e. Moreover, there are some investigations that tried to improve thermoelectric performance by both enhancing PF and reducing κ L .…”