Scalable solution-phase epitaxial growth of symmetry-mismatched heterostructures on two-dimensional crystal soft template
- Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry
- Univ. of Houston, TX (United States). Dept. of Physics. Texas Center for Superconductivity
- Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering
- Boise State Univ., ID (United States). Dept. of Mechanical and Biomedical Engineering
- Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering. California NanoSystems Inst.
- Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry. California NanoSystems Inst.
Epitaxial heterostructures with precisely controlled composition and electronic modulation are of central importance for electronics, optoelectronics, thermoelectrics, and catalysis. In general, epitaxial material growth requires identical or nearly identical crystal structures with small misfit in lattice symmetry and parameters and is typically achieved by vapor-phase depositions in vacuum. We report a scalable solution-phase growth of symmetry-mismatched PbSe/Bi2Se3 epitaxial heterostructures by using two-dimensional (2D) Bi2Se3 nanoplates as soft templates. The dangling bond–free surface of 2D Bi2Se3 nanoplates guides the growth of PbSe crystal without requiring a one-to-one match in the atomic structure, which exerts minimal restriction on the epitaxial layer. With a layered structure and weak van der Waals interlayer interaction, the interface layer in the 2D Bi2Se3 nanoplates can deform to accommodate incoming layer, thus functioning as a soft template for symmetry-mismatched epitaxial growth of cubic PbSe crystal on rhombohedral Bi2Se3 nanoplates. We show that a solution chemistry approach can be readily used for the synthesis of gram-scale PbSe/Bi2Se3 epitaxial heterostructures, in which the square PbSe (001) layer forms on the trigonal/hexagonal (0001) plane of Bi2Se3 nanoplates. We further show that the resulted PbSe/Bi2Se3 heterostructures can be readily processed into bulk pellet with considerably suppressed thermal conductivity (0.30 W/m·K at room temperature) while retaining respectable electrical conductivity, together delivering a thermoelectric figure of merit ZT three times higher than that of the pristine Bi2Se3 nanoplates at 575 K. Our study demonstrates a unique epitaxy mode enabled by the 2D nanocrystal soft template via an affordable and scalable solution chemistry approach. It opens up new opportunities for the creation of diverse epitaxial heterostructures with highly disparate structures and functions.
- Research Organization:
- Univ. of California, Los Angeles, CA (United States); Boise State Univ., ID (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-07ER46433; AC02-05CH11231; DMR1508144; EFRI-1433541
- OSTI ID:
- 1473901
- Journal Information:
- Science Advances, Vol. 2, Issue 10; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Atomic-Scale Insights into the Lateral and Vertical Epitaxial Growth in Two-Dimensional Pd2Se3–MoS2 Heterostructures
Van der Waals epitaxial growth of two-dimensional single-crystalline GaSe domains on graphene