Multifunctional semiconductor micro-Hall devices for magnetic, electric, and photo-detection

Gilbertson, A. M. and Sadeghi, Hatef and Panchal, V. and Kazakova, O. and Lambert, C. J. and Solin, S. A. and Cohen, L. F. (2015) Multifunctional semiconductor micro-Hall devices for magnetic, electric, and photo-detection. Applied Physics Letters, 107 (23): 233504. ISSN 0003-6951

[thumbnail of 1.4936932]
PDF (1.4936932)
1.4936932.pdf - Published Version
Available under License None.

Download (2MB)


We report the real-space voltage response of InSb/AlInSb micro-Hall devices to local photo-excitation, electric, and magnetic fields at room temperature using scanning probe microscopy. We show that the ultrafast generation of localised photocarriers results in conductance perturbations analogous to those produced by local electric fields. Experimental results are in good agreement with tight-binding transport calculations in the diffusive regime. The magnetic, photo, and charge sensitivity of a 2 μm wide probe are evaluated at a 10 μA bias current in the Johnson noise limit (valid at measurement frequencies > 10 kHz) to be, respectively, 500 nT/√Hz; 20 pW/√Hz (λ = 635 nm) comparable to commercial photoconductive detectors; and 0.05 e/√Hz comparable to that of single electron transistors. These results demonstrate the remarkably versatile sensing attributes of simple semiconductor micro-Hall devices that can be applied to a host of imaging and sensing applications.

Item Type:
Journal Article
Journal or Publication Title:
Applied Physics Letters
Additional Information:
Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, 107 (23), 2015 and may be found at
Uncontrolled Keywords:
?? physics and astronomy (miscellaneous) ??
ID Code:
Deposited By:
Deposited On:
14 Dec 2015 11:20
Last Modified:
04 Apr 2024 23:43