(Invited) Harnessing Graphene Nanoribbons and Hexagonal Boron Nitride for Next-Generation Nanoelectronics and Photovoltaics

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This talk will present our group’s recent work on engineering semiconducting graphene nanoribbon arrays and inorganic/organic mixed-dimensional heterostructures to realize next-generation nanoelectronics and photovoltaics. First, arrays of aligned semiconducting graphene nanoribbons with sub-5-nm widths and well-defined edges promise to meet the demands of speed, energy efficiency, density, and functionality required for next-generation semiconductor electronics. However, the development of nanoribbon-based technologies has been inhibited by challenges in the industry-compatible, scalable production of nanoribbon arrays with high structural precision. Here, we present our work on developing a new nanoribbon fabrication route that combines the scalability and reproducibility of top-down patterning with the atomic-scale structural precision of bottom-up crystal growth to realize nanoribbons with tunable narrow widths, nearly atomically defined armchair edges, unidirectional alignment, and controlled placement directly on conventional Ge or Ge/Si wafers via chemical vapor deposition (CVD). Second, singlet fission, a novel carrier multiplication process, promises to enhance the efficiency of silicon-based solar cells, which currently dominate the solar cell market, from 27% to beyond 40% by increasing the yield with which blue/green photons in the solar spectrum are converted to electricity. However, the performance of singlet-fission-enhanced silicon solar cells is severely limited by challenges in controlling the molecular packing and electronic coupling in solid-state films and at heterojunction interfaces. Here, we will discuss our work on utilizing 2D materials to help overcome these challenges. We have discovered how to harness 2D materials to engineer films of organic singlet fission chromophores with desirable packing motifs, unprecedented polymorph selectivity, controlled surface orientation, and enhanced crystallinity, all of which promise to improve singlet fission solar cells.

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