Coupled double triplet state in singlet fission
- 28 November 2018
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 20 (48), 30083-30094
- https://doi.org/10.1039/c8cp06256k
Abstract
The highly unusual state, 1(TT), is a coupled, double triplet state that has recently garnered significant attention. This multiexcitonic state can be formed by a quantum transition from a single-photon bright state in a variety of organic semiconducting materials. 1(TT)'s transient nature and similarity to independent triplets, however, has led to significant difficulties in characterization and prediction of its properties. Recent progress describing 1(TT) from theory and experiment are breaking through these difficulties, and have greatly advanced our comprehension of this state. Starting from the early description of 1(TT) in polyenes, this perspective discusses formation mechanisms, spectroscopic signatures, and the scope of intertriplet interactions. When employing singlet fission to generate charge carriers in a solar cell, 1(TT) has a central role. Due to the variety of coupling strengths between triplet states in 1(TT) amongst different chromophores, two different strategies are discussed to enable efficient charge carrier extraction. Continued growth in our understanding of 1(TT) may lead to control over complex quantum states for intriguing applications beyond high-efficiency, organic solar cells.This publication has 122 references indexed in Scilit:
- Activated Singlet Exciton Fission in a Semiconducting PolymerJournal of the American Chemical Society, 2013
- External Quantum Efficiency Above 100% in a Singlet-Exciton-Fission–Based Organic Photovoltaic CellScience, 2013
- Efficient Singlet Fission Discovered in a Disordered Acene FilmJournal of the American Chemical Society, 2012
- Mechanism for Singlet Fission in Pentacene and Tetracene: From Single Exciton to Two TripletsJournal of the American Chemical Society, 2011
- Nonadiabatic Events and Conical IntersectionsAnnual Review of Physical Chemistry, 2011
- Singlet Exciton Fission in Nanostructured Organic Solar CellsNano Letters, 2011
- Singlet Exciton Fission for Solar Cell Applications: Energy Aspects of Interchromophore CouplingThe Journal of Physical Chemistry B, 2009
- Restricted active space spin-flip configuration interaction approach: theory, implementation and examplesPhysical Chemistry Chemical Physics, 2009
- Morphology Effectively Controls Singlet-Triplet Exciton Relaxation and Charge Transport in Organic SemiconductorsPhysical Review Letters, 2009
- Low-lying .pi.-electron states of trans-butadieneJournal of the American Chemical Society, 1973