Journal
NATURE MATERIALS
Volume 20, Issue 10, Pages 1401-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41563-021-01074-4
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Funding
- Leading Initiative for Excellent Young Researchers of JSPS
- PRESTO-JST through the project 'Scientific Innovation for Energy Harvesting Technology' [JPMJPR17R2]
- JSPS [JP17H06123, JP17H06200, 20H00387]
- JST FOREST Program [JPMJFR2020]
- Grants-in-Aid for Scientific Research [20H00387] Funding Source: KAKEN
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By utilizing an ion gel on top of a solution-processed, single-crystalline organic semiconductor film, researchers have observed a two-dimensional hole gas with high carrier density. The findings demonstrate the potential for tailoring low-dimensional electronic states through molecularly engineered heterointerfaces.
A highly conductive metallic gas that is quantum mechanically confined at a solid-state interface is an ideal platform to explore non-trivial electronic states that are otherwise inaccessible in bulk materials. Although two-dimensional electron gases have been realized in conventional semiconductor interfaces, examples of two-dimensional hole gases, the counterpart to the two-dimensional electron gas, are still limited. Here we report the observation of a two-dimensional hole gas in solution-processed organic semiconductors in conjunction with an electric double layer using ionic liquids. A molecularly flat single crystal of high-mobility organic semiconductors serves as a defect-free interface that facilitates two-dimensional confinement of high-density holes. A remarkably low sheet resistance of 6 k omega and high hole-gas density of 10(14) cm(-2) result in a metal-insulator transition at ambient pressure. The measured degenerate holes in the organic semiconductors provide an opportunity to tailor low-dimensional electronic states using molecularly engineered heterointerfaces. A two-dimensional hole gas with high carrier density is confined at the interface between a solution-processed, single-crystalline organic semiconducting film and the electric double layer formed by an ion gel on top of the film.
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