Research Article


2018, 11(4): 1977–1986


Piezotronic effect on the luminescence of quantum dots for micro/nano-newton force measurement

Yan Zhang1,2, Jiaheng Nie1, and Lijie Li3 (*)

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1 School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
2 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing 100083, China
3 Multidisciplinary Nanotechnology Centre, College of Engineering, Swansea University, Swansea SA1 8EN, UK

Keywords: piezotronic effect, quantum dot (QD), luminescence, force measurement
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  • Abstract
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ABSTRACT The luminescence of semiconductor quantum dots (QDs) can be adjusted using the piezotronic effect. An external mechanical force applied on the QD generates a piezoelectric potential, which alters the luminescence of the QD. A small mechanical force may induce a significant change on the emission spectrum. In the case of InN QDs, it is demonstrated that the unforced emission wavelength is more than doubled by a force of 1 μN. The strategy of using the piezotronic effect to tune the color of the emission leads to promising noncontact forcemeasurement applications in biological and medical sensors and force-sensitive displays. Several piezoelectric semiconductor materials have been investigated in terms of the tunability of the emission wavelength in the presence of an external applied force. It is found that CdS and CdSe demonstrate much higher tunability δλ/δF, which makes them suitable for micro/nano-newton force measurement applications.
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Piezotronic effect on the luminescence of quantum dots for micro/nano-newton force measurement. Nano Res. 2018, 11(4): 1977–1986

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