Short-lived charge-transfer excitons in organic photovoltaic cells studied by high-field magneto-photocurrent

Ayeleth H. Devir-Wolfman, Bagrat Khachatryan, Bhoj R. Gautam, Lior Tzabary, Amit Keren, Nir Tessler, Z. Valy Vardeny and Eitan Ehrenfreund ()
Additional contact information
Ayeleth H. Devir-Wolfman: Technion-Israel Institute of Technology
Bagrat Khachatryan: Technion-Israel Institute of Technology
Bhoj R. Gautam: University of Utah
Lior Tzabary: Technion-Israel Institute of Technology
Amit Keren: Technion-Israel Institute of Technology
Nir Tessler: Technion-Israel Institute of Technology
Z. Valy Vardeny: University of Utah
Eitan Ehrenfreund: Technion-Israel Institute of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract The main route of charge photogeneration in efficient organic photovoltaic cells based on bulk hetero-junction donor–acceptor blends involves short-lived charge-transfer excitons at the donor–acceptor interfaces. The cell efficiency is critically affected by the charge-transfer exciton recombination and dissociation processes. By measuring the magneto-photocurrent under ambient conditions at room temperature, we show here that magnetic field-induced spin-mixing among the charge-transfer exciton spin sublevels occurs in fields up to at least 8.5 Tesla. The resulting magneto-photocurrent increases at high fields showing non-saturating behaviour up to the highest applied field. We attribute the observed high-field spin-mixing mechanism to the difference in the donor–acceptor g-factors. The non-saturating magneto-photocurrent response at high field indicates that there exist charge-transfer excitons with lifetime in the sub-nanosecond time domain. The non-Lorentzian high-field magneto-photocurrent response indicates a dispersive decay mechanism that originates due to a broad distribution of charge-transfer exciton lifetimes.

Date: 2014
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/ncomms5529 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:5:y:2014:i:1:d:10.1038_ncomms5529

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

DOI: 10.1038/ncomms5529

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 ().