Enhanced thermoelectric efficiency via orthogonal electrical and thermal conductances in phosphorene.

By R. Fei, Alireza Faghaninia, Ryan Soklaski, Jia-An Yan, C. Lo, Li Yang. Nano letters (Print), 2014

715 citations recorded by the source corpus.

Thermoelectric devices that utilize the Seebeck effect convert heat flow into electrical energy and are highly desirable for the development of portable, solid state, passively powered electronic systems. The conversion efficiencies of such devices are quantified by the dimensionless thermoelectric figure of merit (ZT), which is proportional to the ratio of a device's electrical conductance to its thermal conductance. In this paper, a recently fabricated two-dimensional (2D) semiconductor called phosphorene (monolayer black phosphorus) is assessed for its thermoelectric capabilities. First-principles and model calculations reveal not only that phosphorene possesses a spatially anisotropic electrical conductance, but that its lattice thermal conductance exhibits a pronounced spatial-anisotropy as well. The prominent electrical and thermal conducting directions are orthogonal to one another, enhancing the ratio of these conductances. As a result, ZT may reach the criterion for commercial deployment along the armchair direction of phosphorene at T = 500 K and is close to 1 even at room temperature given moderate doping (∼2 × 10(16) m(-2) or 2 × 10(12) cm(-2)). Ultimately, phosphorene hopefully stands out as an environmentally sound thermoelectric material with unprecedented qualities. Intrinsically, it is a mechanically flexible material that converts heat energy with high efficiency at low temperatures (∼300 K), one whose performance does not require any sophisticated engineering techniques.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/067177124ec525e13d4f4d96d5addf4d7cb00fcb

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In Materials Chemistry

1. Yong‐Wei Zhang
2. Gang Zhang
3. Yongqing Cai
4. K. Novoselov
5. Z. Ong
6. V. Sorkin
7. Fengnian Xia
8. A. C. Castro Neto

Citations in the corpus

• Recent advances in synthesis, properties, and applications of phosphorene (2017, background): “Preferred electrical and thermal transport are orthogonal in phosphorene and large ratios of electrical over thermal conductivity can be achieved.(101) Several theoretical studies revealed that strain engineering has significant influence on the ZT value, therefore, optimized conditions and strain e”
• 2D materials and van der Waals heterostructures (2016, background): “In addition to its optical and electronic properties, fundamental research in phosphorene has unraveled a growing number of physical phenomena, including superconductivity, high thermoelectric figure ofmerit (39), birefringence, and colossal ultraviolet (UV) absorption.”
• Recent Advances in the Study of Phosphorene and its Nanostructures (2017, methodology): “sors, photodetectors, flexible electronics, and optical switches),(27,45,46) energy technologies (solar cells, photocatalysis, anodes in lithium- and sodium-ion batteries), thermoelectric and composite materials.(30,32,52) The recent discovery of quantum oscillations (step-like”
• Strain effects on thermoelectric properties of two-dimensional materials (2015, background): “demonstrated this point [143].”