Ignited by the isolation of graphene from graphite in 2004, the field of two-dimensional materials now boasts access to over 3000 materials. These materials exhibit virtually all properties relevant to electronics, from conductors and semiconductors to dielectrics, thermoelectrics, and ferroelectrics. However, scaling these properties from lab-scale demonstrations to large areas for commercialisation remains a central challenge. This problem centres on the structural artefacts produced during thin film formation, such as grain boundaries from growth or junctions from solution assembly. The electrical performance of solution-processed 2D thin films has traditionally lagged far behind those produced by growth techniques. However, recent advances have now closed this gap, with charge carrier mobilities of solution-assembled thin films routinely becoming competitive with CVD-grown counterparts. This talk will chart the progress toward eliminating the junction problem. It will cover the early production of 2D films and their electrical properties, the identification of intersheet junctions as the primary performance bottleneck, the key material and structural parameters for high performance, and characterisation methods for measuring junction resistance. A distinct advantage of solution processing is its unique ability to target intersheet junctions directly with techniques designed to suppress losses. In conclusion, the talk will discuss several such junction-engineering techniques that hold the potential to produce large-area thin films that reflect the intrinsic properties of individual nanosheets with high fidelity
Dr. Adam Kelly completed his Ph.D. in Trinity College, Dublin focusing on the solution processing of layered crystals to create dispersions of two-dimensional materials for electronic device applications. This was fundamental work on the electrical properties of 2D thin films to uncover the properties (both nanosheet and thin film) that are needed for high performance devices, with work published in Science, Nature Reviews Materials, Nature Nanotechnology and Nature Communications. He completed an MSCA fellowship at the NOVA University of Lisbon is now a Principal Investigator at its CENIMAT research center. His current research interests include producing 2D thin films that do not suffer junction losses, energy harvesting devices, and identifying strategic nanomaterials to strengthen European technological self-reliance.
Ignited by the isolation of graphene from graphite in 2004, the field of two-dimensional materials now boasts access to over 3000 materials. These materials exhibit virtually all properties relevant to electronics, from conductors and semiconductors to dielectrics, thermoelectrics, and ferroelectrics. However, scaling these properties from lab-scale demonstrations to large areas for commercialisation remains a central challenge. This problem centres on the structural artefacts produced during thin film formation, such as grain boundaries from growth or junctions from solution assembly. The electrical performance of solution-processed 2D thin films has traditionally lagged far behind those produced by growth techniques. However, recent advances have now closed this gap, with charge carrier mobilities of solution-assembled thin films routinely becoming competitive with CVD-grown counterparts. This talk will chart the progress toward eliminating the junction problem. It will cover the early production of 2D films and their electrical properties, the identification of intersheet junctions as the primary performance bottleneck, the key material and structural parameters for high performance, and characterisation methods for measuring junction resistance. A distinct advantage of solution processing is its unique ability to target intersheet junctions directly with techniques designed to suppress losses. In conclusion, the talk will discuss several such junction-engineering techniques that hold the potential to produce large-area thin films that reflect the intrinsic properties of individual nanosheets with high fidelity
Dr. Adam Kelly completed his Ph.D. in Trinity College, Dublin focusing on the solution processing of layered crystals to create dispersions of two-dimensional materials for electronic device applications. This was fundamental work on the electrical properties of 2D thin films to uncover the properties (both nanosheet and thin film) that are needed for high performance devices, with work published in Science, Nature Reviews Materials, Nature Nanotechnology and Nature Communications. He completed an MSCA fellowship at the NOVA University of Lisbon is now a Principal Investigator at its CENIMAT research center. His current research interests include producing 2D thin films that do not suffer junction losses, energy harvesting devices, and identifying strategic nanomaterials to strengthen European technological self-reliance.
