Rational design of Al₂O₃/2D perovskite heterostructure dielectric for high performance MoS₂ phototransistors.

ABSTRACT: Two-dimensional (2D) Ruddlesden-Popper perovskites are currently drawing significant attention as highly-stable photoactive materials for optoelectronic applications. However, the insulating nature of organic ammonium layers in 2D perovskites results in poor charge transport and limited performance. Here, we demonstrate that Al₂O₃/2D perovskite heterostructure can be utilized as photoactive dielectric for high-performance MoS₂ phototransistors. The type-II band alignment in 2D perovskites facilitates effective spatial separation of photo-generated carriers, thus achieving ultrahigh photoresponsivity of >10⁸ A/W at 457 nm and >10⁶ A/W at 1064 nm. Meanwhile, the hysteresis loops induced by ionic migration in perovskite and charge trappin

SUBMITTER: Jiang J 

PROVIDER: S-EPMC7450060 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature