Journal ArticleDOI
Ultrafast Triplet Pair Separation and Triplet Trapping following Singlet Fission in Amorphous Pentacene Films
Kyle T. Munson,Jianing Gan,Christopher Grieco,Grayson S. Doucette,John E. Anthony,John B. Asbury +5 more
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In this article, the dynamics of triplet pair separation following singlet fission in amorphous and crystalline films of the model Singlet Fission was examined using ultrafast infrared and electronic spectroscopy.Abstract:
Ultrafast infrared and electronic spectroscopy are used to examine the dynamics of triplet pair separation following singlet fission in amorphous and crystalline films of the model singlet fission ...read more
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Journal Article
Effects of Crystal Morphology on Singlet Exciton Fission in Diketopyrrolopyrrole Thin Films B
PatrickE. Hartnett,Eric A. Margulies,Catherine M. Mauck,Stephen A. Miller,Yilei Wu,Yi Lin Wu,Tobin J. Marks,Michael R. Wasielewski +7 more
TL;DR: In this paper, the authors investigated Singlet exciton fission (SF) in Diketopyrrolopyrrole (DPP) for the first time and determined that SF is nearly quantitative in these films and that DPP derivatives are a promising class of SF chromophores for enhancing photovoltaic performance.
Journal ArticleDOI
In optimized rubrene-based nanoparticle blends for photon upconversion, singlet energy collection outcompetes triplet-pair separation, not singlet fission
TL;DR: In this article , the authors showed that the conversion of near-infrared photons to visible light in rubrene-based systems is 20x more efficient when mixed with 0.5% wt DBP.
Journal ArticleDOI
In optimized rubrene-based nanoparticle blends for photon upconversion, singlet energy collection outcompetes triplet-pair separation, not singlet fission
David G. Bossanyi,Yoichi Sasaki,Shuanqing Wang,Dimitri Chekulaev,Nobuo Kimizuka,Nobuhiro Yanai,Jenny Clark +6 more
Abstract: The conversion of near-infrared photons to visible light through triplet–triplet annihilation upconversion offers an enticing strategy for significantly boosting the efficiency of conventional solar cell technology. Rubrene is widely employed as the acceptor molecule for realising such upconversion, yet in the solid state, the reverse process of singlet fission is believed to hinder efficient upconversion. Consequently, rubrene is sometimes doped at low concentration (0.5 mol%) with the singlet energy collector tetraphenyldibenzoperiflanthene (DBP) which harvests singlet energy via Forster transfer. Although singlet fission is a multi-step process involving various intermediate triplet-pair states, the interplay between it, triplet recombination and singlet energy collection has not been studied in detail to date. Here we use both transient absorption and time-resolved fluorescence spectroscopy to investigate the dynamics of both singlet and triplet species in rubrene-based nanoparticle films. Strikingly, we find that energy transfer from rubrene to DBP does not outcompete the formation of triplet-pairs through singlet fission, despite the fact that DBP doping increases the photoluminescence quantum yield of the nanoparticle films from 3% to 61%. We rationalise this surprising result in the context of the well-known effects of triplet fusion and triplet-quenching defects on the photoluminescence yield of crystalline rubrene.
Journal ArticleDOI
What Next for Singlet Fission in Photovoltaics? The Fate of Triplet and Triplet-Pair Excitons
TL;DR: In this paper , the authors summarize recent progress in understanding the excitonic processes contributing to inefficiencies in singlet fission (SF)sensitized PV devices and identify emerging design principles for improving the separability of triplet-pair excitons.
Journal ArticleDOI
Quantifying Exciton Transport in Singlet Fission Diblock Copolymers.
Guiying He,Lauren M. Yablon,Kaia R. Parenti,Kealan J. Fallon,Luis M. Campos,Matthew Y. Sfeir +5 more
TL;DR: In this paper, the authors designed diblock copolymers comprising an inherent energy cleft at the interface between a block with pendent pentacene chromophores and an additional block having pendent tetracene chophores, which created a driving force for exciton transport along the BCP chain.
References
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Journal ArticleDOI
Detailed Balance Limit of Efficiency of p‐n Junction Solar Cells
TL;DR: In this article, an upper theoretical limit for the efficiency of p−n junction solar energy converters, called the detailed balance limit of efficiency, has been calculated for an ideal case in which the only recombination mechanism of holeelectron pairs is radiative as required by the principle of detailed balance.
Journal ArticleDOI
Decoherence and the transition from quantum to classical
TL;DR: In this paper, the authors argue that without quantum physics we could not explain the behavior of solids, the structure and function of DNA, the color of the stars, the action of lasers or the properties of superfluids.
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Recent Advances in Singlet Fission
Millicent B. Smith,Josef Michl +1 more
TL;DR: The current state of the development of molecular structure design rules, based on first-principles theoretical considerations, is described along with initial examples of implementation.
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Light Absorption and Energy Transfer in the Antenna Complexes of Photosynthetic Organisms.
Tihana Mirkovic,Evgeny E. Ostroumov,Jessica M. Anna,Rienk van Grondelle,Govindjee,Gregory D. Scholes,Gregory D. Scholes +6 more
TL;DR: The description of energy transfer, in particular multichromophoric antenna structures, is shown to vary depending on the spatial and energetic landscape, which dictates the relative coupling strength between constituent pigment molecules.
Journal ArticleDOI
Singlet exciton fission in solution
TL;DR: A triplet yield of 200% and triplet formation rates approaching the diffusion limit in solutions of bis(triisopropylsilylethynyl (TIPS) pentacene are reported, and a transient bound excimer intermediate is observed, formed by the collision of one photoexcited and one ground-state TIPS-pentacene molecule.