Breaking symmetry in device design for self-driven two-dimensional materials based photodetectors
The advent of graphene and other two-dimensional (2D) materials offers great potential for optoelectronics applications. Various device structures and novel mechanisms have been proposed to realize photodetectors with unique detecting properties. In this minireview, we focus on the 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 the self-driven properties, we propose and elaborate the concept of symmetry breaking in 2D materials based self-driven photodetectors. We discuss various mechanisms of breaking symmetry for self-driven photodetectors, including asymmetrical contact engineering, field-induced asymmetry, PN homojunction, and PN heterostructure. 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.
- This article is part of the themed collection: Recent Review Articles