Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 17, Pages 9750-9754Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp300446z
Keywords
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Funding
- FCRP/MSD
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05CH11231]
- Sloan Research Fellowship
- NSF
- Sunchon National University
- National Science Council, Taiwan [NSC 98-2112-M-007-025-MY3]
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We investigate the role of quantum confinement on the performance of gas sensors based on two-dimensional In As membranes. Pd-decorated In As membranes configured as H-2 sensors are shown to exhibit strong thickness dependence, with similar to 100X 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.
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