Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Perovskite-Derivative Valleytronics

Journal Article · · Advanced 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

References (43)

Perovskite‐Based Phototransistors and Hybrid Photodetectors journal August 2019
Printable Semiconductors for Backplane TFTs of Flexible OLED Displays journal August 2019
Bismuth Based Hybrid Perovskites A 3 Bi 2 I 9 (A: Methylammonium or Cesium) for Solar Cell Application journal September 2015
From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives journal January 2019
Synthesis of Co‐Doped MoS 2 Monolayers with Enhanced Valley Splitting journal February 2020
Lead-Free, Blue Emitting Bismuth Halide Perovskite Quantum Dots journal October 2016
Pressure-Induced Emission Enhancement, Band-Gap Narrowing, and Metallization of Halide Perovskite Cs 3 Bi 2 I 9 journal July 2018
Valleytronics: Opportunities, Challenges, and Paths Forward journal August 2018
Opportunities and Challenges of Lead-Free Perovskite Optoelectronic Devices journal July 2019
Strong Electron–Phonon Coupling and Self-Trapped Excitons in the Defect Halide Perovskites A 3 M 2 I 9 (A = Cs, Rb; M = Bi, Sb) journal April 2017
Halide Perovskite Photovoltaics: Background, Status, and Future Prospects journal March 2019
Extended Photo-Conversion Spectrum in Low-Toxic Bismuth Halide Perovskite Solar Cells journal August 2016
Spin-optotronic Properties of Organometal Halide Perovskites journal September 2018
Giant Optical Second Harmonic Generation in Two-Dimensional Multiferroics journal July 2017
Chiral 2D Perovskites with a High Degree of Circularly Polarized Photoluminescence journal March 2019
A Bismuth-Halide Double Perovskite with Long Carrier Recombination Lifetime for Photovoltaic Applications journal February 2016
Enantiomorphic Perovskite Ferroelectrics with Circularly Polarized Luminescence journal February 2020
Organometallic Halide Perovskites: Sharp Optical Absorption Edge and Its Relation to Photovoltaic Performance journal March 2014
Valleytronics in 2D materials journal August 2016
Optically initialized robust valley-polarized holes in monolayer WSe2 journal November 2015
Valley polarization in MoS2 monolayers by optical pumping journal June 2012
Control of valley polarization in monolayer MoS2 by optical helicity journal June 2012
Observation of piezoelectricity in free-standing monolayer MoS2 journal December 2014
Electrical control of second-harmonic generation in a WSe2 monolayer transistor journal April 2015
Hidden spin polarization in inversion-symmetric bulk crystals journal April 2014
Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS2 and WS2 journal August 2015
Two-dimensional semiconductors in the regime of strong light-matter coupling journal July 2018
Present status and future prospects of perovskite photovoltaics journal April 2018
Riddles in perovskite research journal April 2018
Interlayer valley excitons in heterobilayers of transition metal dichalcogenides journal August 2018
Light–valley interactions in 2D semiconductors journal July 2018
Giant nonreciprocal second-harmonic generation from antiferromagnetic bilayer CrI3 journal July 2019
On-device lead sequestration for perovskite solar cells journal February 2020
Indirect to direct bandgap transition in methylammonium lead halide perovskite journal January 2017
Detection of Rashba spin splitting in 2D organic-inorganic perovskite via precessional carrier spin relaxation journal August 2019
Anomalously robust valley polarization and valley coherence in bilayer WS2 journal July 2014
Phonon-mediated intervalley relaxation of positive trions in monolayer WSe 2 journal October 2019
Exciton valley dynamics probed by Kerr rotation in WSe 2 monolayers journal October 2014
Spintronics: Fundamentals and applications journal April 2004
Large polarons in lead halide perovskites journal August 2017
Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber journal October 2013
An organic-inorganic perovskite ferroelectric with large piezoelectric response journal July 2017
Imaging of pure spin-valley diffusion current in WS 2 -WSe 2 heterostructures journal May 2018