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NM11.08.01 : 3D Architecture Based on 2D Lateral Heterojunction

5:00 PM–7:00 PM Apr 4, 2018

PCC North, 300 Level, Exhibit Hall C-E

Description
Shuai Lou1 Yin Liu1 Fuyi Yang1 Shuren Lin1 Ruopeng Zhang1 2 Yang Deng1 Kyle Tom1 3 Karen Bustillo2 Xi Wang1 Mary Scott1 2 Andrew Minor1 2 Jie Yao1 3

1, University of California, Berkeley, Berkeley, California, United States
2, Lawrence Berkeley National Laboratory, Berkeley, California, United States
3, Lawrence Berkeley National Laboratory, Berkeley, California, United States

Engineering the structure of materials endows them with novel physical properties across a wide range of length scales. With high in-plane stiffness and strength, but low flexural rigidity, 2-dimensional (2D) materials are excellent building blocks for nanostructure engineering. They can be easily bent and folded to build 3-dimensional (3D) architectures. Taking advantage of the large lattice mismatch between the constituents, we demonstrate a 3D heterogeneous architecture combining a basal Bi2Se3 nanoplate and wavelike Bi2Te3 edges buckling up and down forming periodic ripples. The balance between bending and in-plane strain energies gives rise to controllable rippling of the material. Our experimental results show clear evidence that the wavelengths and amplitudes of the ripples are dependent on both the widths and thicknesses of the rippled material, matching well with continuum mechanics analysis. The rippled Bi2Se3/Bi2Te3 heterojunction broadens the horizon for the application of 2D materials heterojunction and the design and fabrication of 3D architectures based on them, which could provide a platform to enable nanoscale structure generation and associated photonic/electronic properties manipulation for optoelectronic and electro-mechanic applications.

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