Perovskite-Derivative Valleytronics
- Rice Univ., Houston, TX (United States)
- Texas A & M Univ., College Station, TX (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials
Halide perovskites are revolutionizing the renewable energy sector owing to their high photovoltaic efficiency, low manufacturing cost, and flexibility. Their remarkable mobility and long carrier lifetime are also valuable for information technology, but fundamental challenges like poor stability under an electric field prevent realistic applications of halide perovskites in electronics. Here, it is discovered that valleytronics is a promising route to leverage the advantages of halide perovskites and derivatives for information storage and processing. The synthesized all-inorganic lead-free perovskite derivative, Cs3Bi2I9, exhibits strong light-matter interaction and parity-dependent optically addressable valley degree of freedom. In this work, robust optical helicity in all odd-layer-number crystals with inversion symmetry breaking is observed, indicating excitonic coherence extending well beyond 11 layers. The excellent optical and valley properties of Cs3Bi2I9 arise from the unique parallel bands, according to first principles calculations. This discovery points to new materials design principles for scalable valleytronic devices and demonstrates the promise of perovskite derivatives beyond energy applications.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES); Welch Foundation
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1777478
- Alternate ID(s):
- OSTI ID: 1804185
- Journal Information:
- Advanced Materials, Journal Name: Advanced Materials Journal Issue: 48 Vol. 32; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strong interlayer coupling and long-lived interlayer excitons in two-dimensional perovskite derivatives and transition metal dichalcogenides van der Waals heterostructures
Opto-valleytronic imaging of atomically thin semiconductors
Journal Article
·
Tue Mar 19 20:00:00 EDT 2024
· Materials Today
·
OSTI ID:2480511
Opto-valleytronic imaging of atomically thin semiconductors
Journal Article
·
Sun Jan 15 19:00:00 EST 2017
· Nature Nanotechnology
·
OSTI ID:1375888