How Morphology Affects Singlet Fission in Crystalline Tetracene

Piland, Geoffrey B.; Bardeen, Christopher J.

doi:10.1021/acs.jpclett.5b00569

Cited by 177 publications

(237 citation statements)

References 52 publications

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“…We chose to focus on F 2 -TES ADT as, unlike tetracene, F 2 -TES ADT shows no significant structural phase transition in the thin films (Supplementary Fig. 4), no evidence of ‘excimer’ emission4344 and strong triplet features in transient absorption (TA) spectra. In dilute solution only singlet states emit, with a lifetime of 12 ns.…”

Section: Resultsmentioning

confidence: 99%

The entangled triplet pair state in acene and heteroacene materials

et al. 2017

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Entanglement of states is one of the most surprising and counter-intuitive consequences of quantum mechanics, with potent applications in cryptography and computing. In organic materials, one particularly significant manifestation is the spin-entangled triplet-pair state, which mediates the spin-conserving fission of one spin-0 singlet exciton into two spin-1 triplet excitons. Despite long theoretical and experimental exploration, the nature of the triplet-pair state and inter-triplet interactions have proved elusive. Here we use a range of organic semiconductors that undergo singlet exciton fission to reveal the photophysical properties of entangled triplet-pair states. We find that the triplet pair is bound with respect to free triplets with an energy that is largely material independent (∼30 meV). During its lifetime, the component triplets behave cooperatively as a singlet and emit light through a Herzberg–Teller-type mechanism, resulting in vibronically structured photoluminescence. In photovoltaic blends, charge transfer can occur from the bound triplet pairs with >100% photon-to-charge conversion efficiency.

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Section: Resultsmentioning

confidence: 99%

The entangled triplet pair state in acene and heteroacene materials

et al. 2017

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“…104,105 Studies in amorphous films of acenes yield similar results. 106,107 The effect of defects in amorphous xSF materials is an important area for future study. Application in bulk heterojunctions or other architectures, where large single crystals cannot be employed, demand an understanding and control over such effects.…”

Section: Singlet Fission For Enhancedmentioning

confidence: 99%

Correlating Structure and Function in Organic Electronics: From Single Molecule Transport to Singlet Fission

2015

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Advances in organic chemistry have enabled the synthesis of almost any molecule imaginable for high performance organic electronics. In this field of many possibilities, the question becomes not "what can we make" but "how do we guide the design of materials that can be made?" In this review, we address how single molecule conductance measurements can inform the rational design of organic electronics. We also survey recent developments in singlet fission and highlight areas where work can be done to make this process efficient and applicable.

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“…[35][36][37][38][39][40][41][42][43] In this case, a largely unexplored question is the relationship between SF process and SE migration. Several experiments 37,38,40 have observed that the SE delocalization can drive a rapid SF process in well-arranged molecular crystals.…”

Section: Introductionmentioning

confidence: 99%

Effects of Charge Transfer State and Exciton Migration on Singlet Fission Dynamics in Organic Aggregates

Zang

Zhao

et al. 2016

J. Phys. Chem. C

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A time-dependent wavepacket diffusion method is used to investigate the effects of charge transfer (CT) states, singlet exciton and multiexciton migrations on singlet fission (SF) dynamics in organic aggregates. The results reveal that the incorporation of CT states can result in a different SF dynamics from the direct interaction between singlet exciton and multiexciton, and an obvious SF interference is also observed between the direct channel and the indirect channel mediated by CT states. In the case of direct interaction, although the fast population transfer of singlet exciton in monomers, by the increase of exciton-exciton interaction, can accelerate the SF process, the spatial coherence alternatively has a counter-productive effect, and their competition leads to an optimal exciton-exciton interaction at which SF has a maximal rate. This trade-off relationship in SF dynamics is further analysed from different perspectives, specifically in spatial and energy representations, is also confirmed through the indication that static energy disorders can speed up SF process by destructing the coherence.Meanwhile, it is found that the couplings among multiexciton states decrease SF rates by the multiexciton coherence and backward conversion from multiexciton to singlet exciton states.

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How Morphology Affects Singlet Fission in Crystalline Tetracene

Cited by 177 publications

References 52 publications

The entangled triplet pair state in acene and heteroacene materials

The entangled triplet pair state in acene and heteroacene materials

Correlating Structure and Function in Organic Electronics: From Single Molecule Transport to Singlet Fission

Effects of Charge Transfer State and Exciton Migration on Singlet Fission Dynamics in Organic Aggregates

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