Quantum Size Effects on the Chemical Sensing Performance of Two-Dimensional Semiconductors
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- 作者：Junghyo Nah ; S. Bala Kumar ; Hui Fang ; Yu-Ze Chen ; Elena Plis ; Yu-Lun Chueh ; Sanjay Krishna ; Jing Guo ; Ali Javey
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：May 3, 2012
- 年：2012
- 卷：116
- 期：17
- 页码：9750-9754
- 全文大小：310K
- 年卷期：v.116,no.17(May 3, 2012)
- ISSN：1932-7455
文摘
We investigate the role of quantum confinement on the performance of gas sensors based on two-dimensional InAs membranes. Pd-decorated InAs membranes configured as H2 sensors are shown to exhibit strong thickness dependence, with 100脳 enhancement in the sensor response as the thickness is reduced from 48 to 8 nm. Through detailed experiments and modeling, the thickness scaling trend is attributed to the quantization of electrons which favorably alters both the position and the transport properties of charge carriers; thus making them more susceptible to surface phenomena.