Electron tunneling at the molecularly thin 2D perovskite and graphene van der Waals interface

Author:

Leng KaiORCID,Wang LinORCID,Shao Yan,Abdelwahab IbrahimORCID,Grinblat Gustavo,Verzhbitskiy IvanORCID,Li Runlai,Cai Yongqing,Chi Xiao,Fu WeiORCID,Song PengORCID,Rusydi Andrivo,Eda GokiORCID,Maier Stefan A.ORCID,Loh Kian PingORCID

Abstract

Abstract Quasi-two-dimensional perovskites have emerged as a new material platform for optoelectronics on account of its intrinsic stability. A major bottleneck to device performance is the high charge injection barrier caused by organic molecular layers on its basal plane, thus the best performing device currently relies on edge contact. Herein, by leveraging on van der Waals coupling and energy level matching between two-dimensional Ruddlesden-Popper perovskite and graphene, we show that the plane-contacted perovskite and graphene interface presents a lower barrier than gold for charge injection. Electron tunneling across the interface occurs via a gate-tunable, direct tunneling-to-field emission mechanism with increasing bias, and photoinduced charge transfer occurs at femtosecond timescale (~50 fs). Field effect transistors fabricated on molecularly thin Ruddlesden-Popper perovskite using graphene contact exhibit electron mobilities ranging from 0.1 to 0.018 cm2V−1s−1 between 1.7 to 200 K. Scanning tunneling spectroscopy studies reveal layer-dependent tunneling barrier and domain size on few-layered Ruddlesden-Popper perovskite.

Funder

Ministry of Education - Singapore

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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