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K. Au, D. F. Li, N. Y. Chan and J. Y. Dai Polar Liquid Molecule Induced Transport Property Modulation at LaAlO3/SrTiO3 Heterointerface Advanced Materials 24

Article first published online: 12 APR 2012 | DOI: 10.1002/adma.201200673

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Application of LaAlO3/SrTiO3 interfacial two-dimensional electron gas (2DEG) as a polar molecule sensor is demonstrated. The sensing mechanism is due to the formation of a metal-semiconductor Schottky junction when the center of LaAlO3 surface is covered with polar molecules such as water. These results also evidence the existence of a polarization field inside the LaAlO3 layer.

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