High‐Voltage Photogeneration Exclusively via Aggregation‐Induced Triplet States in a Heavy‐Atom‐Free Nonplanar Organic Semiconductor

The electron–hole recombination kinetics of organic photovoltaics (OPVs) are known to be sensitive to the relative energies of triplet and charge‐transfer (CT) states. Yet, the role of exciton spin in systems having CT states above 1.7 eV—like those in near‐ultraviolet‐harvesting OPVs—has largely no...

Full description

Saved in:
Bibliographic Details
Published in:Advanced energy materials 2019-12, Vol.9 (48), p.n/a
Main Authors: Davy, Nicholas C., Koch, Marius, Ngongang Ndjawa, Guy Olivier, Lin, Xin, Man, Gabriel J., Lin, YunHui L., Sorli, Jeni C., Rand, Barry P., Kahn, Antoine, Scholes, Gregory D., Loo, Yueh‐Lin
Format: Article
Language:English
Subjects:
Agglomeration
Charge transfer
Circuits
Electronics
electro‐optical materials
Excimers
Excitons
intersystem crossing
luminescence
organic electronics
Photoexcitation
Photovoltaic cells
photovoltaic devices
Separation
solar cells
triplet excitons
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The electron–hole recombination kinetics of organic photovoltaics (OPVs) are known to be sensitive to the relative energies of triplet and charge‐transfer (CT) states. Yet, the role of exciton spin in systems having CT states above 1.7 eV—like those in near‐ultraviolet‐harvesting OPVs—has largely not been investigated. Here, aggregation‐induced room‐temperature intersystem crossing (ISC) to facilitate exciton harvesting in OPVs having CT states as high as 2.3 eV and open‐circuit voltages exceeding 1.6 V is reported. Triplet excimers from energy‐band splitting result in ultrafast CT and charge separation with nonradiative energy losses of
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201901649