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Issue 15, 2020
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Breaking symmetry in device design for self-driven 2D material based photodetectors

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Abstract

The advent of graphene and other two-dimensional (2D) materials offers great potential for optoelectronic applications. Various device structures and novel mechanisms have been proposed to realize photodetectors with unique detecting properties. In this minireview, we focus on a self-driven photodetector that has great potential for low-power or even powerless operation required in the internet of things and wearable electronics. To address the general principle of self-driven properties, we propose and elaborate the concept of symmetry breaking in 2D material based self-driven photodetectors. We discuss various mechanisms of breaking symmetry for self-driven photodetectors, including asymmetrical contact engineering, field-induced asymmetry, PN homojunctions, and PN heterostructures. Typical device examples based on these mechanisms are reviewed and compared. The performance of current self-driven photodetectors is critically assessed and future directions are discussed towards the target application fields.

Graphical abstract: Breaking symmetry in device design for self-driven 2D material based photodetectors

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Article information


Submitted
16 Feb 2020
Accepted
09 Mar 2020
First published
10 Mar 2020

Nanoscale, 2020,12, 8109-8118
Article type
Minireview

Breaking symmetry in device design for self-driven 2D material based photodetectors

Q. Wang, C. Zhou and Y. Chai, Nanoscale, 2020, 12, 8109
DOI: 10.1039/D0NR01326A

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