Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Focus: Triplet States in Organic Optoelectronics II

CPP 39.1: Hauptvortrag

Mittwoch, 9. März 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.