Magnetic field effect on the thermostimulated chemiluminescence of photoperoxidized rubrene

Frankevich, E. L.; Rumyantsev, B. M.; Lesin, V. I.

doi:10.1016/0022-2313(75)90083-6

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…The singlet exciton then diffuses to the TPTPA-rubrene interface which is then transferred to the singlet state of rubrene by FRET due to the energy alignment of the singlet state of TPTPA (S TPTPA ¼ 2.8 eV, estimated from fluorescence) and rubrene (S rubrene ¼ 2.3 eV). 6 The singlet in rubrene then undergoes singlet exciton fission. The process is conditional on the energy of the first excited state being approximately twice the energy of the first triplet (T rubrene ¼ 1.2 eV).…”

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“…The process is conditional on the energy of the first excited state being approximately twice the energy of the first triplet (T rubrene ¼ 1.2 eV). 6 If the two triplet excitons are dissociated, one photon absorbed can result in two charge carriers, potentially doubling the EQE in the absorption region of TPTPA. In order to facilitate charge extraction after exciton dissociation, the highest occupied molecular orbital (HOMO) of the singlet fission layer should be equal to or deeper than the singlet donor.…”

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“…The shapes of these curves with zero crossings at low fields are typical of singlet exciton fission into two triplets. 6,9 The increase in fluorescence is due to the rate of singlet fission decreasing under high magnetic fields (H > 0.2 T) allowing for singlet exciton processes such as fluorescence to compete more efficiently with fission. 10 The measured changes in fluorescence of the co-deposited film are consistent with those of neat rubrene (k ¼ 500 nm) [ Fig.…”

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Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

Reusswig¹,

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et al. 2012

Appl. Phys. Lett.

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Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

Reusswig¹,

Congreve²,

Thompson³

et al. 2012

Appl. Phys. Lett.

101

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Morphological Tuning of the Energetics in Singlet Fission Organic Solar Cells

Lin

Fusella

Kozlov

et al. 2016

Adv Funct Materials

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6489wileyonlinelibrary.com conversion effi ciency (PCE) of a single junction solar cell is 41.9%-a signifi cant improvement over the so-called Shockley-Queisser limit of 32% for conventional devices. [ 6,7 ] The theoretical maximum PCE can be boosted even further if a long wavelength absorber is incorporated to take advantage of solar photons with energies between the singlet and triplet levels of the singlet fi ssion material. [ 1,3,8 ] Because of these exciting prospects, singlet fi ssion solar cells have attracted signifi cant research interest in the last several years.Ultimately, the functionality of this class of solar cells hinges on two requirements: (1) the ability to undergo rapid and effi cient singlet fi ssion, and (2) the ability to dissociate and extract the triplets that are generated by singlet fi ssion. Regarding the fi rst criterion, signifi cant efforts have been made to identify and engineer materials that readily undergo singlet fi ssion. The polyacenes (e.g., tetracene, pentacene) stand out in terms of usage, and have been incorporated in singlet-fi ssion-based solar cells [ 1,2,5 ] and photodetectors with great success. [ 3,9 ] Rubrene, a tetracene derivative, is capable of fast singlet fi ssion [ 10,11 ] but has not experienced the same levels of usage as other acenes, perhaps on the basis of its morphological variability and inferior performance in solar cells. As for the second requirement, little effort has been made to gain control over triplet extraction, yet it remains fundamental to the functionality of singlet fi ssion solar cells. In particular, only charge transfer processes from the triplet, and not the singlet, of the singlet fi ssion material are able to contribute to the effi ciency gains outlined above.We demonstrate that the tunable morphology of rubrene can be used to substantially change the behavior of devices in favor of more effi cient photocurrent generation. Specifically, the charge transfer (CT) state of a rubrene/C 60 solar cell can be shifted by over 300 meV simply by crystallizing the asdeposited amorphous fi lms. This shift in CT state energy is able to transform the amorphous device from one that blocks charge transfer of rubrene triplets into one that readily dissociates rubrene triplets. We conduct a comprehensive study of the impact of morphology on exciton dynamics in rubrene/C 60 systems and analyze its implications on device performance. Ultimately, the ability to morphologically fi ne-tune the interfacial energetics and the singlet fi ssion kinetics in such devices opens Effective singlet fi ssion solar cells require both fast and effi cient singlet fi ssion as well as favorable energetics for harvesting the resulting triplet excitons. Notable progress has been made to engineer materials with rapid and effi cient singlet fi ssion, but the ability to control the energetics of these solar cells remains a challenge. Here, it is demonstrated that the interfacial charge transfer state energy of a rubrene/C 60 solar cell can be modifi ed dramatically by the mo...

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Photoconductivity of sublimated rubrene films during oxidation. The magnetic field effect

Frankevich

Tribel

Soroltk

1976

Physica Status Solidi (b)

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The Magnetic Field Effect E. L. FRANKEVICH, M. M. TRIBEL, and I. A. SOROLTRThe mechanism of carrier generation in sublimated rubrene films in the course of their oxidation is investigated. The technique of the simultaneous measurement of photoconductivity and fluorescence of the samples and their variation in magnetic fields up to 3 kOe is employed. The excited states whose deactivation leads to both, fluorescence and carrier generation in unoxidized films are found to be rubrene singlet excited molecules 'MI and in films exposed to air. excited complexes of 'RZ, with 0, molecules and with transannular rubrene peroxide molecules RIO,. The probability of carrier generation in the interaction of 'Nil with 0, is higher than with MO,. The existence is shown of a n efficient channel of generation of triplet rubrene excitons, associated with the deactivation of excited triplet complexes of rubrene with MO,. The influence is investigated of variations in the crystalline structure of films on the behaviour of photoconductivity. Hax py6pesa B npouecce IIX oKmneHm. lIpuMeHeHa nieTonma OAHoBpeMeHHoro ucra~epe~m @OTOII~OBOJU~MOCTB B QmyopecueHuna o6pa3qo~, a TaKme ux ume-I/ICCJIenOBaH MeXaH113M reHepaUHl1 HOCHTenefi TOKa D CY6JlHMApOBaHHbIX nJIeH-HeHAfi B MarHElTHbIX IIOJIFIX HanPFIXeHHOCTbW A 0 3 koe. nOKa3aH0, 9 T O B036ym-HeHHbIMA COCTOFIHBHMM, Ae3aKTHBaUMFI KoToPbIX IIPRBOHRT KaK K @JIyOpeCqeHqAA, TPK EI H reHepaUHI4 HOCATeJIefi TOKB, B HeOKHCJleHHbIX IIJIeHHaX XBJIFIWTCII CAH-rjIeTHbIe B036YWAeHHble MoJIeKyJlbI py6peHa 'hfl, a B IIJIeHKaX, MMeBIlIAX HOHTaKT C B03AYXOM, -BO36ymneHHble KOMnJIeKCbI, 06pa30BaHHbIe '&Il C MOJleHyJlaMH BepOFITHOCTb 06pa30BaHHX HOCHTeJIefi TOKa IIpH B3aAMOnefiCTB&4H 'MI C 0, BbILLIe, 9eM C MO,. nOKa3aHO CyWCCTBOBaHMe B@@eKTUBHOTO HaHaJIa reHepauME3 TpEinJleT-HbIX BKCHTOHOB p y 6 p e~a , CBH3PHHOTO C ne3aHTHBaUElefh TpHnJIeTHbIX B036yXneH-HblX HOMnJIeKCOB py6peaa C MOJleHYJIaMA &PO,. MCCJlenOBaHo TaK)iie BJIMflHHe U3MeHeHMfi KpHCTaJlJIHqeCKOfi CTPYHTYPbI nJIeHOK Ha IIOBeneHEle @OTonpOBOAK-MOCTI?. K A C J I O~O~~ 0,, a TaKme c MoneKynaMM TpaHcaHHynXpHom nepeKMcM p y 6 p e~a MO,.

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Magnetic field effect on the thermostimulated chemiluminescence of photoperoxidized rubrene

Cited by 12 publications

References 10 publications

Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

Morphological Tuning of the Energetics in Singlet Fission Organic Solar Cells

Photoconductivity of sublimated rubrene films during oxidation. The magnetic field effect

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