Interlayer Exciton Polarons in Mesoscopic V <sub>2</sub> O <sub>5</sub> for Broadband Optoelectronic Synapses
Abstract Persistent photoconductivity and optoelectronic synaptic behavior are demonstrated in solution‐processed mesoscopic α‐phase vanadium pentoxide (V 2 O 5 ) thin films. First‐principles simulations coupled with the two‐site Holstein polaron hopping model show that vacancies at the terminal oxygen position lead to long recombination times because photoexcited electrons and holes reside on different layers separated by the van der Waals gap, forming a weakly coupled interlayer exciton polaron. Mid‐gap polaronic states also significantly broaden the photoresponse of the films to span across visible and infrared wavelengths. By controlling the amplitude/intensity, duration, and/or number of optical pulses, tunable optoelectronic memory functions, such as short‐term and long‐term plasticity, are experimentally established in V 2 O 5 ‐based optoelectronic synapses. Device fabrication was extended to mechanically flexible ultrathin glass substrates. Flexible optoelectronic synapses maintained high performance after 150 bending cycles.
Authors
- Sarbajit Banerjee (ORCID: https://orcid.org/0000-0002-2028-4675)
- Savio Laricchia (ORCID: https://orcid.org/0000-0003-0962-6272)
- Thanh Luan Phan (ORCID: https://orcid.org/0000-0002-2873-8176)
- Joseph M. Luther (ORCID: https://orcid.org/0000-0002-4054-8244)
- Elisa M. Miller (ORCID: https://orcid.org/0000-0002-7648-5433)
- Swagata Acharya (ORCID: https://orcid.org/0000-0001-8074-0030)
- Andrew J. Ferguson (ORCID: https://orcid.org/0000-0003-2544-1753)
- Lance M. Wheeler (ORCID: https://orcid.org/0000-0002-1685-8242)
- Jinghua Guo (ORCID: https://orcid.org/0000-0002-8576-2172)
- Katherine Jungjohann (ORCID: https://orcid.org/0000-0002-8132-1230)
- Jeffrey L. Blackburn (ORCID: https://orcid.org/0000-0002-9237-5891)
- Srikrishna Sagar (ORCID: https://orcid.org/0000-0002-0121-265X)
- Michelle A. Smeaton (ORCID: https://orcid.org/0000-0001-9114-1009)
- Dimitar Pashov (ORCID: https://orcid.org/0000-0002-4292-9745)
- Md Azimul Haque (ORCID: https://orcid.org/0000-0003-3528-0674)
- Alice R. Giem (ORCID: https://orcid.org/0000-0002-3215-7817)
- Jialu Li
Institutions
- National Laboratory of the Rockies (US)
- Lawrence Berkeley National Laboratory (US)
- King's College London (GB)
- Institute of Structure of Matter (IT)
- Texas A&M University (US)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2025-11-20
- DOI
- https://doi.org/10.1002/adfm.202510479
- Primary Topic
- Transition Metal Oxide Nanomaterials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- U.S. Department of Energy
- Office of Science
- Office of Energy Efficiency and Renewable Energy
- Basic Energy Sciences
- Office of Energy Efficiency
- National Renewable Energy Laboratory
- Lawrence Berkeley National Laboratory