Resonant enhancement in nanostructured thermoelectric performance via electronic thermal conductivity engineering
arXiv:1608.04463 · doi:10.1016/j.physe.2016.08.005
Abstract
The use of an asymmetric broadening in the transport distribution, a characteristic of resonant structures, is proposed as a route to engineer a decrease in electronic thermal conductivity thereby enhancing the electronic figure of merit in nanostructured thermoelectrics. Using toy models, we first demonstrate that a decrease in thermal conductivity resulting from such an asymmetric broadening may indeed lead to an electronic figure of merit well in excess of 1000 in an idealized situation and in excess of 10 in a realistic situation. We then substantiate with realistic resonant structures designed using graphene nano-ribbons by employing a tight binding framework with edge correction that match density functional theory calculations under the local density approximation. The calculated figure of merit exceeding 10 in such realistic structures further reinforces the concept and sets a promising direction to use nano-ribbon structures to engineer a favorable decrease in the electronic thermal conductivity.
arXiv comment7 pages, 6 figures in Physica E (2016)
References in corpus (21)
- The SIESTA method for ab initio order-N materials simulation
- Efficient index handling of multidimensional periodic boundary conditions
- Density functional method for nonequilibrium electron transport
- Tailoring the atomic structure of graphene nanoribbons by STM lithography
- Theory of enhancement of thermoelectric properties of materials with nanoinclusions
- Efficiency at maximum power of low dissipation Carnot engines
- Universality of efficiency at maximum power
- Reversible thermoelectric nanomaterials
- Thermoelectric energy harvesting with quantum dots
- Thermoelectric efficiency at maximum power in a quantum dot
- Most efficient quantum thermoelectric at finite power output
- Enhanced thermoelectric figure of merit in edge disordered zigzag graphene nanoribbons
- Thermoelectric efficiency at maximum power in low-dimensional systems
- On Landauer vs. Boltzmann and Full Band vs. Effective Mass Evaluation of Thermoelectric Transport Coefficients
- Powerful and efficient energy harvester with resonant-tunneling quantum dots
- Thermoelectric properties of finite graphene antidot lattices
- Quantum Dot in Z-shaped Graphene Nanoribbon
- Performance analysis of an interacting quantum dot thermoelectric system
- Three-terminal heat engine and refrigerator based on superlattices
- Power and efficiency analysis of a realistic resonant tunneling diode thermoelectric
- Exploring Packaging Strategies of Nano-embedded Thermoelectric Generators