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Effect Of As Flux On Inas Submonolayer Quantum Dot Formation For Infrared Photodetectors, K. D. Vallejo, P. J. Simmonds

Physics Faculty Publications and Presentations

The performance of infrared photodetectors based on submonolayer quantum dots was investigated as a function of the arsenic flux. All the devices showed similar figures of merit and a very high specific detectivity above 1 × 10¹¹ cm Hz^1/2/W at 12 K, despite the fact that cross-sectional scanning tunneling microscopy images pointed out a strong reduction in the density of such nanostructures with decreasing arsenic flux. This contrast is a consequence of the small size and low In content of the submonolayer quantum dots that lead to a strong delocalization of the electrons wave function and, therefore, …