Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: Focus: Triplet States in Organic Optoelectronics II
CPP 39.1: Invited Talk
Wednesday, March 9, 2016, 15:00–15:30, H37
The Nature of the `Triplet Pair State' in Singlet Exciton Fission. — •Jenny Clark1, Andrew Musser2, Chaw Keong Yong2, and Daniel Polak1 — 1University of Sheffield, Hicks Buildling, Hounsfield Road, S3 7RH, Sheffield, United Kingdom — 2University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom
Singlet exciton fission is a process by which the bright singlet (spin-0) exciton spontaneously splits into two triplet (spin-1) excitons. The triplets are initially coupled into an overall singlet state, conserving spin. Over time the triplets lose their correlation and become `free triplets'. The nature of the intermediate state, which may be described as a correlated (entangled) triplet pair has been the subject of debate.
In this talk, I will discuss our recent work describing the nature of the intermediate triplet-pair state and its fate: how it either (i) separates into free triplets; (ii) emits a photon; (iii) returns to the singlet manifold or (iv) in a suitable blend, undergoes double charge-transfer.
I will talk about two material classes: acenes and polyenes and highlight how their different electronic properties affect the process of singlet exciton fission and its potential to be exploited to enhance solar cell efficiency.