Estimation of the potential performance in p-type SnSe crystals through evaluating weighted mobility and effective mass

Qin, Bingchao; He, Wei; Zhao, Li‐Dong

doi:10.1016/j.jmat.2020.06.003

Cited by 50 publications

(36 citation statements)

References 46 publications

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“…The large change in μ w for s = 3 is known as a sign of the deviation from the free electron model because of the presence of grain boundaries and/or impurity scattering. [ 48,49 ] The calculated μ w values of PCPDTSBT‐OC and PPDT2FBT‐OC are 6.7–7.5 cm 2 V −1 s −1 and 10.6–11.5 cm 2 V −1 s −1 , respectively. Meanwhile, the PCPDTSBT‐Mix film exhibits a μ w of ≈0.2 cm 2 V −1 s −1 at a low σ range and ≈2.9 cm 2 V −1 s −1 at the maximum σ.…”

Section: Resultsmentioning

confidence: 99%

Degenerately Doped Semi‐Crystalline Polymers for High Performance Thermoelectrics

Lee

Park

Son

et al. 2020

Adv Funct Materials

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Thermoelectric (TE) energy conversion in conjugated polymers is considered a promising approach for low‐energy harvesting and self‐powered temperature sensing. To enhance the TE performance, it is necessary to understand the relationship between the Seebeck coefficient (α) and electrical conductivity (σ). Typical doped polymers exhibit α–σ relationship that is distinct from that of inorganic materials due to their large structural and energetic disorder, which prevents them from achieving the maximum TE power factor (PF = α2σ). Here, an ideal α–σ relationship in the Kang–Snyder model following a transport parameter s = 1 is demonstrated with two degenerately doped semi‐crystalline polymers, poly[(4,4′‐(bis(hexyldecylsulfanyl)methylene)cyclopenta[2,1‐b:3,4‐b′]dithiophene)‐alt‐(benzo[c][1,2,5]thiadiazole)] (PCPDTSBT) and poly[(2,5‐bis(2‐hexyldecyloxy)phenylene)‐alt‐(5,6‐difluoro‐4,7‐di(thiophen‐2‐yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) using a sequential doping method. The results allow the realization of the PFs reaching theoretic maxima (i.e., 112.01 µW m−1 K−2 for PPDT2FBT and 49.80 µW m−1 K−2 for PCPDTSBT) and close to metallic behavior in heavily doped films. Additionally, it is shown that the PF maxima appear when the doping state switches from non‐degenerate to degenerate. Strategies towards an optimal α–σ relationship enable optimization of the PF and provide an understanding of the charge transport of doped polymers.

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Section: Resultsmentioning

confidence: 99%

Degenerately Doped Semi‐Crystalline Polymers for High Performance Thermoelectrics

Lee

Park

Son

et al. 2020

Adv Funct Materials

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“…7 SnE, which has its bandgap located between those of Si and GaAs, exhibits both the p-and n-type conduction depending on the concentration of tin. [12][13][14] Therefore, SnE can be potentially used as a solar absorber in thin film solar cells and near-infrared detectors 3,15,16 and as a photovoltaic material. 2,17 On the other hand, tin dichalcogenides SnE 2 (SnS 2 /SnSe 2 ) are n-type semiconductors with an indirect band gap of 2.1 eV/1.1 eV and a direct band gap of 2.8 eV/1.8 eV.…”

Section: Introductionmentioning

confidence: 99%

Single source precursor route to nanometric tin chalcogenides

et al. 2021

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“…The quality factor B is a parameter for estimating the optimal thermoelectric properties of a specific material according to the effective mass model, and the quality factor B is obtained by Equation ( 16 ). The weighted mobility μ w is calculated by the electrical conductivity and Seebeck coefficient according to Equation ( 17 ) [ 46 , 47 ].

in which m e and e are unit mass of free electron and the electron charge, respectively.…”

Section: Resultsmentioning

confidence: 99%

Contrasting Thermoelectric Transport Behaviors of p -Type PbS Caused by Doping Alkali Metals (Li and Na)

Hou

Wang

et al. 2020

Research

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PbS is a latent substitute of PbTe thermoelectric materials, which is on account of its superiority in low cost and earth abundance. Here, the thermoelectric transport properties of p-type PbS by doping alkali metals (Na and Li) are investigated and it is verified that Li is a more effective dopant than Na. By introducing Li, the electrical and thermal transport properties were optimized collectively. The electrical transport properties were boosted remarkably via adjusting carrier concentration, and the maximum power factor (PFmax) of ~11.5 μW/cmK2 and average power factor (PFave) ~9.9 μW/cmK2 between 423 and 730 K in Pb0.99Li0.01S were achieved, which are much higher than those (~9.5 and ~7.7 μW/cmK2) of Pb0.99Na0.01S. Doping Li and Na can weaken the lattice thermal conductivity effectively. Combining the enlarged PF with suppressed total thermal conductivity, a maximum ZT ~0.5 at 730 K and a large average ZT ~0.4 at 423-730 K were obtained in p-type Pb0.99Li0.01S, which are higher than ~0.4 and ~0.3 in p-type Pb0.99Na0.01S, respectively.

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Estimation of the potential performance in p-type SnSe crystals through evaluating weighted mobility and effective mass

Cited by 50 publications

References 46 publications

Degenerately Doped Semi‐Crystalline Polymers for High Performance Thermoelectrics

Degenerately Doped Semi‐Crystalline Polymers for High Performance Thermoelectrics

Single source precursor route to nanometric tin chalcogenides

Contrasting Thermoelectric Transport Behaviors of p -Type PbS Caused by Doping Alkali Metals (Li and Na)

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