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.
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7 December 2015
Research Article|
December 09 2015
Multifunctional semiconductor micro-Hall devices for magnetic, electric, and photo-detection
A. M. Gilbertson
;
A. M. Gilbertson
1Blackett Laboratory,
Imperial College London
, Prince Consort Road, London SW7 2BZ, United Kingdom
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Hatef Sadeghi;
Hatef Sadeghi
2Department of Physics,
Lancaster University
, Lancaster LA1 4YB, United Kingdom
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V. Panchal;
V. Panchal
3
National Physical Laboratory
, Teddington TW11 0LW, United Kingdom
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O. Kazakova;
O. Kazakova
3
National Physical Laboratory
, Teddington TW11 0LW, United Kingdom
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C. J. Lambert;
C. J. Lambert
2Department of Physics,
Lancaster University
, Lancaster LA1 4YB, United Kingdom
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S. A. Solin
;
S. A. Solin
1Blackett Laboratory,
Imperial College London
, Prince Consort Road, London SW7 2BZ, United Kingdom
4Department of Physics and Institute for Materials Science and Engineering,
Washington University in St. Louis
, St. Louis, Missouri 63130, USA
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L. F. Cohen
L. F. Cohen
1Blackett Laboratory,
Imperial College London
, Prince Consort Road, London SW7 2BZ, United Kingdom
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Appl. Phys. Lett. 107, 233504 (2015)
Article history
Received:
July 11 2015
Accepted:
November 20 2015
Citation
A. M. Gilbertson, Hatef Sadeghi, V. Panchal, O. Kazakova, C. J. Lambert, S. A. Solin, L. F. Cohen; Multifunctional semiconductor micro-Hall devices for magnetic, electric, and photo-detection. Appl. Phys. Lett. 7 December 2015; 107 (23): 233504. https://doi.org/10.1063/1.4936932
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