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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Leng K,Wang L,Shao Y,Abdelwahab I,Grinblat G,Verzhbitskiy I,Li R,Cai Y,Chi X,Fu W,Song P,Rusydi A,Eda G,Maier SA,Loh KP

doi

10.1038/s41467-020-19331-6

subject

Has Abstract

pub_date

2020-10-30 00:00:00

pages

5483

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19331-6

journal_volume

11

pub_type

杂志文章

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