Directional dependent piezoelectric effects in chemical vapor deposition (CVD) grown monolayer MoS₂ for flexible piezoelectric nanogenerators (NGs).

Lateral piezoresponse force microscopy measurements revealed that the magnitude of the piezoelectric polarization in monolayer MoS₂ significantly depends on the atomic orientation axis of MoS₂.

Flexible piezoelectric NGs were successfully fabricated using the CVD-grown single-crystalline monolayer MoS₂ flakes.

The output power obtained from the NG with the armchair direction of MoS₂ is about two times higher than the zigzag direction of MoS₂.

New effectively harvest mechanical energy using novel flexible piezoelectric NGs based on 2D semiconducting piezoelectric MoS₂ for powering low power-consuming devices and realizing self-powered electronics.