Strain-Induced Lateral Heterostructures in Patterned Semiconductor Nanomembranes for Micro- and Optoelectronics
- Boston Univ., MA (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Columbia Univ., New York, NY (United States)
- Boston Univ., MA (United States); Columbia Univ., New York, NY (United States)
The ability to tailor the energy band lineup of semiconductor materials plays a key role in the development of many electronic and optoelectronic devices, and normally relies on heteroepitaxy. Here we report a different method, based on strain engineering, for the controlled introduction of variations in bandgap energy with lateral position in thin films. External stress is applied on Ge nanomembranes stacked with an array of amorphous-Si pillars, in order to create a non-uniform strain (and therefore bandgap energy) distribution commensurate with the sample thickness variations. The resulting strain profiles are mapped using Bragg diffraction with a hard x-ray probe featuring nanoscale spatial resolution. Compared with traditional heterostructures grown by epitaxial techniques, these strain-engineered samples involve a single chemical composition, and are not limited in the choice of compatible materials by any restriction imposed by lattice-matching requirements. Furthermore, their energy band lineups can be patterned in nearly arbitrary shapes using nanolithography to control the thickness profile, and can be tuned actively by varying the applied stress. As a result, these structures are attractive for a wide range of device applications (including lasers, LEDs, solar cells, and thermoelectrics) that require complex heterostructure lineups with multiple bandgap energies.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0012704; FG02-03ER46028; DMR-1121288
- OSTI ID:
- 1812500
- Alternate ID(s):
- OSTI ID: 1832529
- Report Number(s):
- BNL-221958-2021-JAAM
- Journal Information:
- ACS Applied Nano Materials, Vol. 4, Issue 6; ISSN 2574-0970
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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