Unified Model for Singlet Fission Within a Non-conjugated Covalent Pentacene Dimer

Overview

Journal Nat Commun

Specialty Biology

Date 2017 May 19

PMID 28516916

Citations 41

Authors

Bettina S Basel

Johannes Zirzlmeier

Constantin Hetzer

Brian T Phelan

Matthew D Krzyaniak

S Rajagopala Reddy

Pedro B Coto

Noah E Horwitz

Ryan M Young

Fraser J White

Frank Hampel

Timothy Clark

Michael Thoss

Rik R Tykwinski

Michael R Wasielewski

Dirk M Guldi

Affiliations

Soon will be listed here.

Abstract

When molecular dimers, crystalline films or molecular aggregates absorb a photon to produce a singlet exciton, spin-allowed singlet fission may produce two triplet excitons that can be used to generate two electron-hole pairs, leading to a predicted ∼50% enhancement in maximum solar cell performance. The singlet fission mechanism is still not well understood. Here we report on the use of time-resolved optical and electron paramagnetic resonance spectroscopy to probe singlet fission in a pentacene dimer linked by a non-conjugated spacer. We observe the key intermediates in the singlet fission process, including the formation and decay of a quintet state that precedes formation of the pentacene triplet excitons. Using these combined data, we develop a single kinetic model that describes the data over seven temporal orders of magnitude both at room and cryogenic temperatures.

Citing Articles

Photodegradation reveals that singlet energy transfer impedes energy-gradient-driven singlet fission in polyacene blends.

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The Acetylene Bridge in Intramolecular Singlet Fission: A Boon or A Nuisance?.

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Diverse quantum interference regimes in intramolecular singlet fission chromophores with thiophene-based linkers.

Lee J, Eom S, Kim H Chem Sci. 2024; .

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Long-Lived Triplets from Singlet Fission in Pentacene-Decorated Helical Supramolecular Polymers.

Lavarda G, Sharma A, Beslac M, Jansen S, Meskers S, Friend R J Am Chem Soc. 2024; 146(42):28985-28993.

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Supramolecular scaffold-directed two-dimensional assembly of pentacene into a configuration to facilitate singlet fission.

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