Doctoral Thesis: Technology and Applications of 2D-Materials in Micro- and Macroscale Electronics


Event Speaker: 

Marek Hempel

Event Location: 

online, Zoom or Skype (see details below)

Event Date/Time: 

Wednesday, April 8, 2020 - 1:00pm


Over the past 50 years, electronics has truly revolutionized our lives. Today, many everyday objects rely on electronic circuity from smaller gadgets such as wireless earbuds, smartphones or laptops to larger devices such as household appliances and cars. However, the size range of electronic devices is still rather limited from the millimeter to meter scale. Being able to extend the reach of electronics from the size of a red blood cell to a skyscraper would enable new applications in many areas including energy production, entertainment, environmental sensing, and healthcare. 2D-materials, a new class of atomically thin materials with a variety of electric properties, are promising for such electronic systems with extreme dimension due to their flexibility and ease of integration. On the macroscopic side, electronics produced on thin films by roll-to-roll fabrication has great potential due to its high throughput and low production cost. Towards this end, this thesis explores the transfer of 2D materials onto flexible EVA/PET substrates with hot roll lamination and electrochemical delamination using a custom designed roll-to-roll setup. The transfer process in characterized in detail and the lamination of multiple 2D material layers is demonstrated. As exemplary large-scale electronics application, a flexible solar cell with graphene transparent electrode is discussed. On the microscopic side, this thesis presents a 60x60 µm2 electronic platform called synthetic cells or SynCells. This platform offers a variety of building blocks such as chemical sensors and transistors based on molybdenum disulfide, passive germanium timers, iron magnets for actuation, as well as gallium nitride LEDs and solar cells for communication and energy harvesting. Several system level applications of SynCells are explored such as sensing in a microfluidic channel or spray-coating SynCells on arbitrary surfaces.
Thesis Supervisor(s): Jing Kong and Tomas Palacios

Notes for Marek's Thesis Defense
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