Optically accessible long-lived electronic biexcitons at room temperature in strongly coupled H- aggregates

Siddhartha Sohoni, Indranil Ghosh, Geoffrey T. Nash, Claire A. Jones, Lawson T. Lloyd, Beiye C. Li, Karen L. Ji, Zitong Wang, Wenbin Lin and Gregory S. Engel ()
Additional contact information
Siddhartha Sohoni: The University of Chicago
Indranil Ghosh: The University of Chicago
Geoffrey T. Nash: The University of Chicago
Claire A. Jones: The University of Chicago
Lawson T. Lloyd: The University of Chicago
Beiye C. Li: The University of Chicago
Karen L. Ji: The University of Chicago
Zitong Wang: The University of Chicago
Wenbin Lin: The University of Chicago
Gregory S. Engel: The University of Chicago

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Photon absorption is the first process in light harvesting. Upon absorption, the photon redistributes electrons in the materials to create a Coulombically bound electron-hole pair called an exciton. The exciton subsequently separates into free charges to conclude light harvesting. When two excitons are in each other’s proximity, they can interact and undergo a two-particle process called exciton-exciton annihilation. In this process, one electron-hole pair spontaneously recombines: its energy is lost and cannot be harnessed for applications. In this work, we demonstrate the creation of two long-lived excitons on the same chromophore site (biexcitons) at room temperature in a strongly coupled H-aggregated zinc phthalocyanine material. We show that exciton-exciton annihilation is suppressed in these H- aggregated chromophores at fluences many orders of magnitudes higher than solar light. When we chemically connect the same aggregated chromophores to allow exciton diffusion, we observe that exciton-exciton annihilation is switched on. Our findings demonstrate a chemical strategy, to toggle on and off the exciton-exciton annihilation process that limits the dynamic range of photovoltaic devices.

Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-024-52341-2 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52341-2

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-024-52341-2

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().