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

Kai Leng, Lin Wang, Yan Shao, Ibrahim Abdelwahab, Gustavo Grinblat, Ivan Verzhbitskiy, Runlai Li, Yongqing Cai, Xiao Chi, Wei Fu, Peng Song, Andrivo Rusydi, Goki Eda, Stefan A. Maier and Kian Ping Loh ()
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Kai Leng: National University of Singapore
Lin Wang: National University of Singapore
Yan Shao: National University of Singapore
Ibrahim Abdelwahab: National University of Singapore
Gustavo Grinblat: Faculty of Physics, Ludwig-Maximilians-Universität München
Ivan Verzhbitskiy: Center for Advanced 2D Materials and Graphene Research Centre
Runlai Li: National University of Singapore
Yongqing Cai: University of Macau
Xiao Chi: National University of Singapore
Wei Fu: National University of Singapore
Peng Song: National University of Singapore
Andrivo Rusydi: National University of Singapore
Goki Eda: National University of Singapore
Stefan A. Maier: Department of Physics, Imperial College London
Kian Ping Loh: National University of Singapore

Nature Communications, 2020, vol. 11, issue 1, 1-8

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.

Date: 2020
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DOI: 10.1038/s41467-020-19331-6

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