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Enhanced Peltier Effect in Wrinkled Graphene Constriction by Nano-Bubble Engineering
Xudong Hu1,2, Xue Gong3, Miao Zhang1
1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.
Small (Weinheim an Der Bergstrasse, Germany)
|February 28, 2020
Summary
Graphene wrinkles exhibit electrothermal Peltier effects for cooling and heating. Nano-bubble engineering enhances this effect, paving the way for advanced 2D thermoelectric devices and on-chip cooling solutions.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene's thermoelectric and electrothermal properties are crucial for waste heat recovery and on-chip cooling.
- Graphene wrinkles, common in large-scale films, have largely unexplored thermoelectric potential.
- Investigating novel structures is key to advancing thermoelectric conversion capabilities.
Purpose of the Study:
- To report the electrothermal Peltier effect in graphene wrinkles.
- To explore the impact of nano-bubble engineering on enhancing the Peltier effect.
- To establish graphene wrinkles as a platform for 2D thermoelectrics and on-chip cooling.
Main Methods:
- Fabrication of graphene wrinkles on a germanium substrate.
- Visualization of Peltier cooling and heating effects across the wrinkle.
- Patterning of nano-bubble structures to induce current crowding and enhance the effect.
Main Results:
- Unambiguous visualization of Peltier cooling and heating across graphene wrinkles.
- Observed polarities consistent with p-type doping and spatial distribution.
- Demonstrated enhancement of the Peltier effect through nano-bubble induced current crowding.
Conclusions:
- The Peltier effect in graphene wrinkles arises from non-equilibrium charge transport via interlayer tunneling.
- Graphene wrinkles with nano-bubble engineering offer an innovative platform for designing 2D thermoelectrics.
- This work opens possibilities for active on-chip cooling in 2D nanoelectronics using van der Waals junctions.
