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

Abstract

The luminescence of semiconductor quantum dot (QD) can be adjusted by piezotronic effect. An external mechanical force applied on the QD generates piezoelectric potential, which alters the luminescence of the QD. A small mechanical force may induce significant change on the emission spectrum. For InN QD case, it is demonstrated that the un-forced emission wavelength is more than doubled by a 1 μN force. The strategy of using piezotronic effect to tune the colour of the emission leads to promising noncontact force measurement applications in biological, medical sensors and force sensitive displays. More piezoelectric semiconductor materials have been investigated in terms of the tuneability of the emission wavelength in the presence of an external applied force. It is found that CdS and CdSe demonstrate much higher tuneability δλ/δF, which will lead to micro/nano-newton force measurement applications.

Piezotronic Transistor Based on Topological Insulators

“…20,21 Furthermore, piezoelectric charges change wavelength and enhance luminescence in quantum devices, such as ZnO nanowire, single-atomic-layer MoS 2 and CdTe quantum dot devices. [22][23][24][25] Topological insulators have been revealed theoretically and experimentally based on HgTe/CdTe quantum well structure, [26][27][28] which have potential application for low energy consumption and quantum computer. 29,30 The static strain can create or destroy topological insulator states, such as HgTe and Bi 2 Se 3 topological insulator.…”

High-performance piezo-phototronic multijunction solar cells based on single-type two-dimensional materials

“…Inspired by the requirement of high performance and low power consumption, a series of piezotronic and piezo-phototronic devices have been designed, such as nanogenerator [5][6][7], flexible stain sensors [8], piezotronic field-effect transistors [9], piezo-phototronic solar cell [10], piezophototronic photodetectors [11], and LEDs [12]. Piezo-phototronic effect can tune the luminescence based on monolayer MoS 2 and ZnO nanowires for designing highly sensitive optoelectronic devices [13][14][15].…”

C-V characteristics of piezotronic metal-insulator-semiconductor transistor

“…Piezotronic effect on novel quantum states such as topological insulator [19], Rashba spin-orbit interaction [20] has also been studied based on quantum theory and experiments. Furthermore, piezotronic effect has been used to enhance the performance of nanodevices such as solar cells [21], the enhancement of luminescence [22][23][24][25]. Piezotronic logic units based on strain-gated transistors have been demonstrated in Refs.…”