Pyro-phototronic nanogenerator based on flexible 2D ZnO/graphene heterojunction and its application in self-powered near infrared photodetector and active analog frequency modulation

Nanotechnology
Parikshit SahatiyaSushmee Badhulika

Abstract

Even though 2D ZnO has been utilized for enhanced self-powered sensing by strain modulation due to its piezoelectric property, study on utilizing the pyroelectric property of ZnO remains unexplored. The piezoelectric property of 2D ZnO works on mechanical strain, which disrupts the structure of ZnO leading to the failure of the device. For a pyroelectric nanogenerator, the temperature difference can be triggered by an external light source, which does not disrupt the ZnO structure and also avoids the need for physical bending/pressing, as in the case of a piezoelectric nanogenerator. This work represents the first demonstration of the fabrication of a flexible 2D ZnO/Gr pyro-phototronic diode where the pyro-potential generated in the 2D ZnO due to the near infrared (NIR) illumination adds to or subtracts from the built-in electric field of the heterojunction and modulates the depletion region of the heterojunction thereby enabling bias-free operation. Furthermore, the variation in the depletion width of the heterojunction was utilized as a variable capacitor in the frequency modulator, wherein, with the increasing intensity, the frequency of oscillations increased from 9.8 to 10.42 MHz. The work presented provides an alternativ...Continue Reading

References

Apr 15, 2006·Science·Zhong Lin Wang, Jinhui Song
Aug 19, 2008·Nano Letters·Jun ZhouZhong Lin Wang
Aug 4, 2010·Advanced Materials·Wenzhuo WuZhong Lin Wang
Feb 24, 2015·Small·Vinh Quang DangNae-Eung Lee
May 9, 2015·Advanced Materials·Chi ZhangZhong Lin Wang
Dec 22, 2016·ACS Nano·Tao ZhouZhong Lin Wang

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