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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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Au et al. (2012) studied this question.
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