The van der Waals epitaxy of functional materials provides an interesting and efficient way to manipulate the electrical properties of various hybrid two-dimensional (2D) systems. Here we show the controlled epitaxial assembly of semiconducting one-dimensional (1D) atomic chains, AuCN, on graphene and investigate the electrical properties of 1D/2D van der Waals heterostructures. AuCN nanowire assembly is tuned by different growth conditions, although the epitaxial alignment between AuCN chains and graphene remains unchanged. The switching of the preferred nanowire growth axis indicates that diffusion kinetics affects the nanowire formation process. Semiconducting AuCN chains endow the 1D/2D hybrid system with a strong responsivity to photons with an energy above 2.7 eV, which is consistent with the bandgap of AuCN. A large UV response (responsivity â104 A/W) was observed under illumination using 3.1 eV (400 nm) photons. Our study clearly demonstrates that 1D chain-structured semiconductors can play a crucial role as a component in multifunctional van der Waals heterostructures.
Bibliographical noteFunding Information:
This work was mainly supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2017R1A5A1014862 and NRF-2016R1D1A1B03934008). H.H.Y. and K.P. acknowledge support from the Basic Science Research Program (2016R1A2B4014762) and Global Ph.D. Fellowship Program (2015H1A2A1033714) through the National Research Foundation funded by the Ministry of Science and ICT in Korea. J.S. and J.P. acknowledge support from IBS-R006-D1 and the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (NRF-2017R1A5A1015356). S.J. and W.C.L. acknowledge support from the Basic Science Research Program and the Convergence Technology Development Program for Bionic Arm through NRF funded by the Ministry of Science and ICT (2016R1C1B1014940 and 2015M3C1B2052811).
© 2018 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering